a list of strings in Java

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-4

I have a question about setting the value to the list of strings in Java.

For example, if you have a list of strings called names, how would you set the 3rd name to the value "San Diego"?

I tried names.add(2, "San Diego") but it's not working.

Thanks so much for the help!

asked Nov 23 '18 at 8:04

Jamie_dogLover

Also, how would I print the 3rd item from a list called students?

– Jamie_dogLover
Nov 23 '18 at 8:06

1

Try to use set instead of add . To read it you can use get(2) .

– Arnaud
Nov 23 '18 at 8:06

It would depend on the container class, but it’s based java.util.List, then it’s set

– MadProgrammer
Nov 23 '18 at 8:08

1

Oh, add you should consult the JavaDocs first 😉

– MadProgrammer
Nov 23 '18 at 8:10

1

Please read How to Ask. You are supposed to do proper research before asking a question at StackOverflow. This includes reading through the official documentation of a class you are using. The documentation explains all of those methods in detail, and gives examples. Alternatively, you can also search on google and probably find a lot of tutorials and examples on how to use List. Likely, this is also the reason for the down-votes.

– Zabuza
Nov 23 '18 at 8:10

|
show 1 more comment

-4

I have a question about setting the value to the list of strings in Java.

For example, if you have a list of strings called names, how would you set the 3rd name to the value "San Diego"?

I tried names.add(2, "San Diego") but it's not working.

Thanks so much for the help!

asked Nov 23 '18 at 8:04

Jamie_dogLover

Also, how would I print the 3rd item from a list called students?

– Jamie_dogLover
Nov 23 '18 at 8:06

1

Try to use set instead of add . To read it you can use get(2) .

– Arnaud
Nov 23 '18 at 8:06

It would depend on the container class, but it’s based java.util.List, then it’s set

– MadProgrammer
Nov 23 '18 at 8:08

1

Oh, add you should consult the JavaDocs first 😉

– MadProgrammer
Nov 23 '18 at 8:10

1

Please read How to Ask. You are supposed to do proper research before asking a question at StackOverflow. This includes reading through the official documentation of a class you are using. The documentation explains all of those methods in detail, and gives examples. Alternatively, you can also search on google and probably find a lot of tutorials and examples on how to use List. Likely, this is also the reason for the down-votes.

– Zabuza
Nov 23 '18 at 8:10

|
show 1 more comment

-4

I have a question about setting the value to the list of strings in Java.

For example, if you have a list of strings called names, how would you set the 3rd name to the value "San Diego"?

I tried names.add(2, "San Diego") but it's not working.

Thanks so much for the help!

asked Nov 23 '18 at 8:04

Jamie_dogLover

I have a question about setting the value to the list of strings in Java.

For example, if you have a list of strings called names, how would you set the 3rd name to the value "San Diego"?

I tried names.add(2, "San Diego") but it's not working.

Thanks so much for the help!

java

asked Nov 23 '18 at 8:04

Jamie_dogLover

asked Nov 23 '18 at 8:04

Jamie_dogLover

asked Nov 23 '18 at 8:04

Jamie_dogLover

asked Nov 23 '18 at 8:04

Jamie_dogLover

asked Nov 23 '18 at 8:04

Jamie_dogLover

Also, how would I print the 3rd item from a list called students?

– Jamie_dogLover
Nov 23 '18 at 8:06

1

Try to use set instead of add . To read it you can use get(2) .

– Arnaud
Nov 23 '18 at 8:06

It would depend on the container class, but it’s based java.util.List, then it’s set

– MadProgrammer
Nov 23 '18 at 8:08

1

Oh, add you should consult the JavaDocs first 😉

– MadProgrammer
Nov 23 '18 at 8:10

1

Please read How to Ask. You are supposed to do proper research before asking a question at StackOverflow. This includes reading through the official documentation of a class you are using. The documentation explains all of those methods in detail, and gives examples. Alternatively, you can also search on google and probably find a lot of tutorials and examples on how to use List. Likely, this is also the reason for the down-votes.

– Zabuza
Nov 23 '18 at 8:10

|
show 1 more comment

Also, how would I print the 3rd item from a list called students?

– Jamie_dogLover
Nov 23 '18 at 8:06

1

Try to use set instead of add . To read it you can use get(2) .

– Arnaud
Nov 23 '18 at 8:06

It would depend on the container class, but it’s based java.util.List, then it’s set

– MadProgrammer
Nov 23 '18 at 8:08

1

Oh, add you should consult the JavaDocs first 😉

– MadProgrammer
Nov 23 '18 at 8:10

1

Please read How to Ask. You are supposed to do proper research before asking a question at StackOverflow. This includes reading through the official documentation of a class you are using. The documentation explains all of those methods in detail, and gives examples. Alternatively, you can also search on google and probably find a lot of tutorials and examples on how to use List. Likely, this is also the reason for the down-votes.

– Zabuza
Nov 23 '18 at 8:10

Also, how would I print the 3rd item from a list called students?

– Jamie_dogLover
Nov 23 '18 at 8:06

Try to use set instead of add . To read it you can use get(2) .

– Arnaud
Nov 23 '18 at 8:06

It would depend on the container class, but it’s based java.util.List, then it’s set

– MadProgrammer
Nov 23 '18 at 8:08

Oh, add you should consult the JavaDocs first 😉

– MadProgrammer
Nov 23 '18 at 8:10

Please read How to Ask. You are supposed to do proper research before asking a question at StackOverflow. This includes reading through the official documentation of a class you are using. The documentation explains all of those methods in detail, and gives examples. Alternatively, you can also search on google and probably find a lot of tutorials and examples on how to use List. Likely, this is also the reason for the down-votes.

– Zabuza
Nov 23 '18 at 8:10

|
show 1 more comment

5 Answers
5

active

oldest

votes

To update the already existing value use names.set(2,"String");

answered Nov 23 '18 at 8:06

Deepak Gunasekaran

688212

Gotcha! Thank you, sir. If I want to print the 3rd item from the student list. Can I do System.out.printIn(students.indexOf(2))?

– Jamie_dogLover
Nov 23 '18 at 8:13

use students.get(2); indexOf method will return the index of the object that you pass as the argument if the object is present in the list students. e.g names.indexOf ("San Diego") will return 2 in your case

– Deepak Gunasekaran
Nov 23 '18 at 8:16

add a comment |

names.add(2, "San Diego") will add a new element at the 3rd position (index 2), but it will only work if the List already contains at least 2 elements.

names.set(2, "San Diego") will set the 3rd element (at index 2) to the required value, but it will work only if the List already contains at least 3 elements.

To obtain the 3rd element, you should use names.get(2) (again, the List must contain at least 3 elements for this to work).

answered Nov 23 '18 at 8:09

Eran

293k37485565

Thank you so much!

– Jamie_dogLover
Nov 23 '18 at 8:16

add a comment |

If you want to replace an existing item in a list, you have to use set instead of add

names.set(2,"San Diego");

In here 2 means the index, counting from 0.

Then is the String you want to add

If you want to read values from the list you can use get

String value = names.get(2);

answered Nov 23 '18 at 8:08

Gihan Saranga Siriwardhana

625425

add a comment |

it will work if the List already contains at least 2 elements.

names.add(2, "San Diego") it will override the 3rd element or at index 2.

it is always safe to use

names.set(2, "San Diego") it will set the 3rd value or at index 2 if the list contains at least 3 elements.

Otherwise, it will throw IndexOutOfBoundsException: exception.

answered Nov 23 '18 at 8:33

saurav omar

767

add a comment |

Here are the basic operation you can perform there are plenty of operation you can perform.
One advice try try and try dont give up.
here the is link for java dock for your reference
Java doc for List

package com.varun.list;



import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;



public class ArrayListTest {



  public static void main(String args) {



    //Create array list

    List < String > names = new ArrayList < String > ();



    //Create few names

    String sam = "Sam";

    String jamie = "Jamie_dogLover";

    String bucy = "The Bucky";



    // add all names in the list

    names.add(sam);

    names.add(jamie);

    names.add(bucy);

    System.out.println("List values :" + names); //Output : List values :[Sam, Jamie_dogLover, The Bucky]



    //Update the second index that is -> The Bucky, because list index starts from 0 

    names.set(2, "New Bucky");

    System.out.println("New List values :" + names); //Output : New List values :[Sam, Jamie_dogLover, New Bucky]



    //Lest say you want to remove the the 1st index that is jamie

    names.remove(jamie);

    System.out.println("Updates List values :" + names); //Output : Updates List values :[Sam, New Bucky]



    //Let say you get a list of name from somewhere and you want to add into you existing list(names) 

    names.addAll(listOfDummyNames());



    System.out.println("Updates List values with dummy names :" + names);

    //Output : Updates List values with dummy names :[Sam, New Bucky, Name0, Name1, Name2, Name3, Name4]

    //Let say you want to to remove all the name who has "name" String in it



    Iterator < String > itr = names.iterator();

    while (itr.hasNext()) {

      String name = itr.next();

      if (name.contains("Name")) {

        itr.remove();

      }

    }



    System.out.println("List after removing all name who has Name in it : " + names);



  }



  private static List < String > listOfDummyNames() {



    List < String > dummyList = new ArrayList < String > ();

    String name = "Name";

    for (int i = 0; i < 5; i++) {

      dummyList.add(name + i);

    }



    System.out.println("List of dummy Names :" + dummyList);

    return dummyList;

  }



}

answered Nov 23 '18 at 9:12

Varun

3,10385391

add a comment |

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5 Answers
5

active

oldest

votes

5 Answers
5

active

oldest

votes

To update the already existing value use names.set(2,"String");

answered Nov 23 '18 at 8:06

Deepak Gunasekaran

688212

Gotcha! Thank you, sir. If I want to print the 3rd item from the student list. Can I do System.out.printIn(students.indexOf(2))?

– Jamie_dogLover
Nov 23 '18 at 8:13

use students.get(2); indexOf method will return the index of the object that you pass as the argument if the object is present in the list students. e.g names.indexOf ("San Diego") will return 2 in your case

– Deepak Gunasekaran
Nov 23 '18 at 8:16

add a comment |

To update the already existing value use names.set(2,"String");

answered Nov 23 '18 at 8:06

Deepak Gunasekaran

688212

Gotcha! Thank you, sir. If I want to print the 3rd item from the student list. Can I do System.out.printIn(students.indexOf(2))?

– Jamie_dogLover
Nov 23 '18 at 8:13

use students.get(2); indexOf method will return the index of the object that you pass as the argument if the object is present in the list students. e.g names.indexOf ("San Diego") will return 2 in your case

– Deepak Gunasekaran
Nov 23 '18 at 8:16

add a comment |

To update the already existing value use names.set(2,"String");

answered Nov 23 '18 at 8:06

Deepak Gunasekaran

688212

To update the already existing value use names.set(2,"String");

answered Nov 23 '18 at 8:06

Deepak Gunasekaran

688212

answered Nov 23 '18 at 8:06

Deepak Gunasekaran

688212

answered Nov 23 '18 at 8:06

Deepak Gunasekaran

688212

answered Nov 23 '18 at 8:06

Deepak Gunasekaran

688212

Gotcha! Thank you, sir. If I want to print the 3rd item from the student list. Can I do System.out.printIn(students.indexOf(2))?

– Jamie_dogLover
Nov 23 '18 at 8:13

use students.get(2); indexOf method will return the index of the object that you pass as the argument if the object is present in the list students. e.g names.indexOf ("San Diego") will return 2 in your case

– Deepak Gunasekaran
Nov 23 '18 at 8:16

add a comment |

Gotcha! Thank you, sir. If I want to print the 3rd item from the student list. Can I do System.out.printIn(students.indexOf(2))?

– Jamie_dogLover
Nov 23 '18 at 8:13

use students.get(2); indexOf method will return the index of the object that you pass as the argument if the object is present in the list students. e.g names.indexOf ("San Diego") will return 2 in your case

– Deepak Gunasekaran
Nov 23 '18 at 8:16

Gotcha! Thank you, sir. If I want to print the 3rd item from the student list. Can I do System.out.printIn(students.indexOf(2))?

– Jamie_dogLover
Nov 23 '18 at 8:13

use students.get(2); indexOf method will return the index of the object that you pass as the argument if the object is present in the list students. e.g names.indexOf ("San Diego") will return 2 in your case

– Deepak Gunasekaran
Nov 23 '18 at 8:16

add a comment |

names.add(2, "San Diego") will add a new element at the 3rd position (index 2), but it will only work if the List already contains at least 2 elements.

names.set(2, "San Diego") will set the 3rd element (at index 2) to the required value, but it will work only if the List already contains at least 3 elements.

To obtain the 3rd element, you should use names.get(2) (again, the List must contain at least 3 elements for this to work).

answered Nov 23 '18 at 8:09

Eran

293k37485565

Thank you so much!

– Jamie_dogLover
Nov 23 '18 at 8:16

add a comment |

names.add(2, "San Diego") will add a new element at the 3rd position (index 2), but it will only work if the List already contains at least 2 elements.

names.set(2, "San Diego") will set the 3rd element (at index 2) to the required value, but it will work only if the List already contains at least 3 elements.

To obtain the 3rd element, you should use names.get(2) (again, the List must contain at least 3 elements for this to work).

answered Nov 23 '18 at 8:09

Eran

293k37485565

Thank you so much!

– Jamie_dogLover
Nov 23 '18 at 8:16

add a comment |

names.add(2, "San Diego") will add a new element at the 3rd position (index 2), but it will only work if the List already contains at least 2 elements.

names.set(2, "San Diego") will set the 3rd element (at index 2) to the required value, but it will work only if the List already contains at least 3 elements.

To obtain the 3rd element, you should use names.get(2) (again, the List must contain at least 3 elements for this to work).

answered Nov 23 '18 at 8:09

Eran

293k37485565

names.add(2, "San Diego") will add a new element at the 3rd position (index 2), but it will only work if the List already contains at least 2 elements.

names.set(2, "San Diego") will set the 3rd element (at index 2) to the required value, but it will work only if the List already contains at least 3 elements.

To obtain the 3rd element, you should use names.get(2) (again, the List must contain at least 3 elements for this to work).

answered Nov 23 '18 at 8:09

Eran

293k37485565

answered Nov 23 '18 at 8:09

Eran

293k37485565

answered Nov 23 '18 at 8:09

Eran

293k37485565

answered Nov 23 '18 at 8:09

Eran

293k37485565

Thank you so much!

– Jamie_dogLover
Nov 23 '18 at 8:16

add a comment |

Thank you so much!

– Jamie_dogLover
Nov 23 '18 at 8:16

Thank you so much!

– Jamie_dogLover
Nov 23 '18 at 8:16

add a comment |

If you want to replace an existing item in a list, you have to use set instead of add

names.set(2,"San Diego");

In here 2 means the index, counting from 0.

Then is the String you want to add

If you want to read values from the list you can use get

String value = names.get(2);

answered Nov 23 '18 at 8:08

Gihan Saranga Siriwardhana

625425

add a comment |

If you want to replace an existing item in a list, you have to use set instead of add

names.set(2,"San Diego");

In here 2 means the index, counting from 0.

Then is the String you want to add

If you want to read values from the list you can use get

String value = names.get(2);

answered Nov 23 '18 at 8:08

Gihan Saranga Siriwardhana

625425

add a comment |

If you want to replace an existing item in a list, you have to use set instead of add

names.set(2,"San Diego");

In here 2 means the index, counting from 0.

Then is the String you want to add

If you want to read values from the list you can use get

String value = names.get(2);

answered Nov 23 '18 at 8:08

Gihan Saranga Siriwardhana

625425

If you want to replace an existing item in a list, you have to use set instead of add

names.set(2,"San Diego");

In here 2 means the index, counting from 0.

Then is the String you want to add

If you want to read values from the list you can use get

String value = names.get(2);

answered Nov 23 '18 at 8:08

Gihan Saranga Siriwardhana

625425

answered Nov 23 '18 at 8:08

Gihan Saranga Siriwardhana

625425

answered Nov 23 '18 at 8:08

Gihan Saranga Siriwardhana

625425

answered Nov 23 '18 at 8:08

Gihan Saranga Siriwardhana

625425

add a comment |

it will work if the List already contains at least 2 elements.

names.add(2, "San Diego") it will override the 3rd element or at index 2.

it is always safe to use

names.set(2, "San Diego") it will set the 3rd value or at index 2 if the list contains at least 3 elements.

Otherwise, it will throw IndexOutOfBoundsException: exception.

answered Nov 23 '18 at 8:33

saurav omar

767

add a comment |

it will work if the List already contains at least 2 elements.

names.add(2, "San Diego") it will override the 3rd element or at index 2.

it is always safe to use

names.set(2, "San Diego") it will set the 3rd value or at index 2 if the list contains at least 3 elements.

Otherwise, it will throw IndexOutOfBoundsException: exception.

answered Nov 23 '18 at 8:33

saurav omar

767

add a comment |

it will work if the List already contains at least 2 elements.

names.add(2, "San Diego") it will override the 3rd element or at index 2.

it is always safe to use

names.set(2, "San Diego") it will set the 3rd value or at index 2 if the list contains at least 3 elements.

Otherwise, it will throw IndexOutOfBoundsException: exception.

answered Nov 23 '18 at 8:33

saurav omar

767

it will work if the List already contains at least 2 elements.

names.add(2, "San Diego") it will override the 3rd element or at index 2.

it is always safe to use

names.set(2, "San Diego") it will set the 3rd value or at index 2 if the list contains at least 3 elements.

Otherwise, it will throw IndexOutOfBoundsException: exception.

answered Nov 23 '18 at 8:33

saurav omar

767

answered Nov 23 '18 at 8:33

saurav omar

767

answered Nov 23 '18 at 8:33

saurav omar

767

answered Nov 23 '18 at 8:33

saurav omar

767

add a comment |

package com.varun.list;



import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;



public class ArrayListTest {



  public static void main(String args) {



    //Create array list

    List < String > names = new ArrayList < String > ();



    //Create few names

    String sam = "Sam";

    String jamie = "Jamie_dogLover";

    String bucy = "The Bucky";



    // add all names in the list

    names.add(sam);

    names.add(jamie);

    names.add(bucy);

    System.out.println("List values :" + names); //Output : List values :[Sam, Jamie_dogLover, The Bucky]



    //Update the second index that is -> The Bucky, because list index starts from 0 

    names.set(2, "New Bucky");

    System.out.println("New List values :" + names); //Output : New List values :[Sam, Jamie_dogLover, New Bucky]



    //Lest say you want to remove the the 1st index that is jamie

    names.remove(jamie);

    System.out.println("Updates List values :" + names); //Output : Updates List values :[Sam, New Bucky]



    //Let say you get a list of name from somewhere and you want to add into you existing list(names) 

    names.addAll(listOfDummyNames());



    System.out.println("Updates List values with dummy names :" + names);

    //Output : Updates List values with dummy names :[Sam, New Bucky, Name0, Name1, Name2, Name3, Name4]

    //Let say you want to to remove all the name who has "name" String in it



    Iterator < String > itr = names.iterator();

    while (itr.hasNext()) {

      String name = itr.next();

      if (name.contains("Name")) {

        itr.remove();

      }

    }



    System.out.println("List after removing all name who has Name in it : " + names);



  }



  private static List < String > listOfDummyNames() {



    List < String > dummyList = new ArrayList < String > ();

    String name = "Name";

    for (int i = 0; i < 5; i++) {

      dummyList.add(name + i);

    }



    System.out.println("List of dummy Names :" + dummyList);

    return dummyList;

  }



}

answered Nov 23 '18 at 9:12

Varun

3,10385391

add a comment |

package com.varun.list;



import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;



public class ArrayListTest {



  public static void main(String args) {



    //Create array list

    List < String > names = new ArrayList < String > ();



    //Create few names

    String sam = "Sam";

    String jamie = "Jamie_dogLover";

    String bucy = "The Bucky";



    // add all names in the list

    names.add(sam);

    names.add(jamie);

    names.add(bucy);

    System.out.println("List values :" + names); //Output : List values :[Sam, Jamie_dogLover, The Bucky]



    //Update the second index that is -> The Bucky, because list index starts from 0 

    names.set(2, "New Bucky");

    System.out.println("New List values :" + names); //Output : New List values :[Sam, Jamie_dogLover, New Bucky]



    //Lest say you want to remove the the 1st index that is jamie

    names.remove(jamie);

    System.out.println("Updates List values :" + names); //Output : Updates List values :[Sam, New Bucky]



    //Let say you get a list of name from somewhere and you want to add into you existing list(names) 

    names.addAll(listOfDummyNames());



    System.out.println("Updates List values with dummy names :" + names);

    //Output : Updates List values with dummy names :[Sam, New Bucky, Name0, Name1, Name2, Name3, Name4]

    //Let say you want to to remove all the name who has "name" String in it



    Iterator < String > itr = names.iterator();

    while (itr.hasNext()) {

      String name = itr.next();

      if (name.contains("Name")) {

        itr.remove();

      }

    }



    System.out.println("List after removing all name who has Name in it : " + names);



  }



  private static List < String > listOfDummyNames() {



    List < String > dummyList = new ArrayList < String > ();

    String name = "Name";

    for (int i = 0; i < 5; i++) {

      dummyList.add(name + i);

    }



    System.out.println("List of dummy Names :" + dummyList);

    return dummyList;

  }



}

answered Nov 23 '18 at 9:12

Varun

3,10385391

add a comment |

package com.varun.list;



import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;



public class ArrayListTest {



  public static void main(String args) {



    //Create array list

    List < String > names = new ArrayList < String > ();



    //Create few names

    String sam = "Sam";

    String jamie = "Jamie_dogLover";

    String bucy = "The Bucky";



    // add all names in the list

    names.add(sam);

    names.add(jamie);

    names.add(bucy);

    System.out.println("List values :" + names); //Output : List values :[Sam, Jamie_dogLover, The Bucky]



    //Update the second index that is -> The Bucky, because list index starts from 0 

    names.set(2, "New Bucky");

    System.out.println("New List values :" + names); //Output : New List values :[Sam, Jamie_dogLover, New Bucky]



    //Lest say you want to remove the the 1st index that is jamie

    names.remove(jamie);

    System.out.println("Updates List values :" + names); //Output : Updates List values :[Sam, New Bucky]



    //Let say you get a list of name from somewhere and you want to add into you existing list(names) 

    names.addAll(listOfDummyNames());



    System.out.println("Updates List values with dummy names :" + names);

    //Output : Updates List values with dummy names :[Sam, New Bucky, Name0, Name1, Name2, Name3, Name4]

    //Let say you want to to remove all the name who has "name" String in it



    Iterator < String > itr = names.iterator();

    while (itr.hasNext()) {

      String name = itr.next();

      if (name.contains("Name")) {

        itr.remove();

      }

    }



    System.out.println("List after removing all name who has Name in it : " + names);



  }



  private static List < String > listOfDummyNames() {



    List < String > dummyList = new ArrayList < String > ();

    String name = "Name";

    for (int i = 0; i < 5; i++) {

      dummyList.add(name + i);

    }



    System.out.println("List of dummy Names :" + dummyList);

    return dummyList;

  }



}

answered Nov 23 '18 at 9:12

Varun

3,10385391

package com.varun.list;



import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;



public class ArrayListTest {



  public static void main(String args) {



    //Create array list

    List < String > names = new ArrayList < String > ();



    //Create few names

    String sam = "Sam";

    String jamie = "Jamie_dogLover";

    String bucy = "The Bucky";



    // add all names in the list

    names.add(sam);

    names.add(jamie);

    names.add(bucy);

    System.out.println("List values :" + names); //Output : List values :[Sam, Jamie_dogLover, The Bucky]



    //Update the second index that is -> The Bucky, because list index starts from 0 

    names.set(2, "New Bucky");

    System.out.println("New List values :" + names); //Output : New List values :[Sam, Jamie_dogLover, New Bucky]



    //Lest say you want to remove the the 1st index that is jamie

    names.remove(jamie);

    System.out.println("Updates List values :" + names); //Output : Updates List values :[Sam, New Bucky]



    //Let say you get a list of name from somewhere and you want to add into you existing list(names) 

    names.addAll(listOfDummyNames());



    System.out.println("Updates List values with dummy names :" + names);

    //Output : Updates List values with dummy names :[Sam, New Bucky, Name0, Name1, Name2, Name3, Name4]

    //Let say you want to to remove all the name who has "name" String in it



    Iterator < String > itr = names.iterator();

    while (itr.hasNext()) {

      String name = itr.next();

      if (name.contains("Name")) {

        itr.remove();

      }

    }



    System.out.println("List after removing all name who has Name in it : " + names);



  }



  private static List < String > listOfDummyNames() {



    List < String > dummyList = new ArrayList < String > ();

    String name = "Name";

    for (int i = 0; i < 5; i++) {

      dummyList.add(name + i);

    }



    System.out.println("List of dummy Names :" + dummyList);

    return dummyList;

  }



}

package com.varun.list;



import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;



public class ArrayListTest {



  public static void main(String args) {



    //Create array list

    List < String > names = new ArrayList < String > ();



    //Create few names

    String sam = "Sam";

    String jamie = "Jamie_dogLover";

    String bucy = "The Bucky";



    // add all names in the list

    names.add(sam);

    names.add(jamie);

    names.add(bucy);

    System.out.println("List values :" + names); //Output : List values :[Sam, Jamie_dogLover, The Bucky]



    //Update the second index that is -> The Bucky, because list index starts from 0 

    names.set(2, "New Bucky");

    System.out.println("New List values :" + names); //Output : New List values :[Sam, Jamie_dogLover, New Bucky]



    //Lest say you want to remove the the 1st index that is jamie

    names.remove(jamie);

    System.out.println("Updates List values :" + names); //Output : Updates List values :[Sam, New Bucky]



    //Let say you get a list of name from somewhere and you want to add into you existing list(names) 

    names.addAll(listOfDummyNames());



    System.out.println("Updates List values with dummy names :" + names);

    //Output : Updates List values with dummy names :[Sam, New Bucky, Name0, Name1, Name2, Name3, Name4]

    //Let say you want to to remove all the name who has "name" String in it



    Iterator < String > itr = names.iterator();

    while (itr.hasNext()) {

      String name = itr.next();

      if (name.contains("Name")) {

        itr.remove();

      }

    }



    System.out.println("List after removing all name who has Name in it : " + names);



  }



  private static List < String > listOfDummyNames() {



    List < String > dummyList = new ArrayList < String > ();

    String name = "Name";

    for (int i = 0; i < 5; i++) {

      dummyList.add(name + i);

    }



    System.out.println("List of dummy Names :" + dummyList);

    return dummyList;

  }



}

package com.varun.list;



import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;



public class ArrayListTest {



  public static void main(String args) {



    //Create array list

    List < String > names = new ArrayList < String > ();



    //Create few names

    String sam = "Sam";

    String jamie = "Jamie_dogLover";

    String bucy = "The Bucky";



    // add all names in the list

    names.add(sam);

    names.add(jamie);

    names.add(bucy);

    System.out.println("List values :" + names); //Output : List values :[Sam, Jamie_dogLover, The Bucky]



    //Update the second index that is -> The Bucky, because list index starts from 0 

    names.set(2, "New Bucky");

    System.out.println("New List values :" + names); //Output : New List values :[Sam, Jamie_dogLover, New Bucky]



    //Lest say you want to remove the the 1st index that is jamie

    names.remove(jamie);

    System.out.println("Updates List values :" + names); //Output : Updates List values :[Sam, New Bucky]



    //Let say you get a list of name from somewhere and you want to add into you existing list(names) 

    names.addAll(listOfDummyNames());



    System.out.println("Updates List values with dummy names :" + names);

    //Output : Updates List values with dummy names :[Sam, New Bucky, Name0, Name1, Name2, Name3, Name4]

    //Let say you want to to remove all the name who has "name" String in it



    Iterator < String > itr = names.iterator();

    while (itr.hasNext()) {

      String name = itr.next();

      if (name.contains("Name")) {

        itr.remove();

      }

    }



    System.out.println("List after removing all name who has Name in it : " + names);



  }



  private static List < String > listOfDummyNames() {



    List < String > dummyList = new ArrayList < String > ();

    String name = "Name";

    for (int i = 0; i < 5; i++) {

      dummyList.add(name + i);

    }



    System.out.println("List of dummy Names :" + dummyList);

    return dummyList;

  }



}

answered Nov 23 '18 at 9:12

Varun

3,10385391

answered Nov 23 '18 at 9:12

Varun

3,10385391

answered Nov 23 '18 at 9:12

Varun

3,10385391

answered Nov 23 '18 at 9:12

Varun

3,10385391

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