Showing posts with label collection framework in java. Show all posts

Sunday, 10 May 2015

How to get sub list from ArrayList

we can use sublist(fromindex,toindex) for get sublist from a arraylist.

import java.util.ArrayList;
import java.util.List;

public class GetSubList {

    public static void main(String[] args) {
        ArrayList<String> arr = new ArrayList<String>();
        // add element in arraylist
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");
        arr.add("mysql");
        // print arraylist
        System.out.println("arrayList is = " + arr);

        /*
        * Returns a view of the portion of this list between the specified
        * fromIndex, inclusive, and toIndex, exclusive
        */

        List<String> list=arr.subList(2,4);
        System.out.println("sub list is="+list);

    }

}

Output:

arrayList is = [c, php, html, java, mysql]

sub list is=[html, java]

Create ArrayList In Java

Storing Java Object In ArrayList

How To Copy ArrayList To Array

How to Convert Array to ArrayList

How To Shallow Copy Or Clone a ArrayList

Reverse order of all elements of ArrayList

How to add all elements of a list to ArrayList

Swap elements of Java ArrayList example

Remove All Element From Arraylist Example

how To Remove Element of arraylist

How to Remove List From Arraylist

How to get sub list from ArrayList

How to get element of Arraylist

How to find does ArrayList contains elements or not

How to shuffle elements in ArrayList

How to count number of element in ArrayList

How to replace element in ArrayList

How to insert element in arraylist

How to use retailAll in arraylist

Remove All Element From Arraylist Example

Method 1:

We can remove all element of arraylist using clear() method . clear() removes all element from the list and return empty list.

import java.util.ArrayList;

public class RemoveAll {

    public static void main(String[] args) {

        ArrayList<String> arr = new ArrayList<String>();

        // add element in arraylist
        arr.add("c");
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");

        // print arraylist
        System.out.println("arrayList is = " + arr);

        /*
        * Removes all of the elements from this list.
        */
        arr.clear();

        System.out.println("After Clear arrayList is="+arr);
    }

}

Output:

arrayList is = [c, c, php, html, java]

After Clear arrayList is=[]

Method 2:

import java.util.ArrayList;

public class RemoveAll2 {

    public static void main(String[] args) {
        ArrayList<String> arr = new ArrayList<String>();
        // add element in arraylist
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");
        // print arraylist
        System.out.println("Before Removing arrayList is = " + arr);

        arr.removeAll(arr);
        System.out.println("After Remove all element of aarraylist is="+arr);

    }

}

Output:

Before Removing arrayList is = [c, php, html, java]

After Remove all element of aarraylist is=[]

Create ArrayList In Java

Storing Java Object In ArrayList

How To Copy ArrayList To Array

How to Convert Array to ArrayList

How To Shallow Copy Or Clone a ArrayList

Reverse order of all elements of ArrayList

How to add all elements of a list to ArrayList

Swap elements of Java ArrayList example

Remove All Element From Arraylist Example

how To Remove Element of arraylist

How to Remove List From Arraylist

How to get sub list from ArrayList

How to get element of Arraylist

How to find does ArrayList contains elements or not

How to shuffle elements in ArrayList

How to count number of element in ArrayList

How to replace element in ArrayList

How to insert element in arraylist

How to use retailAll in arraylist

Swap elements of Java ArrayList example

We Swap List element using swap method of    Collections.

import java.util.ArrayList;
import java.util.Collections;

public class SwapElement {

    public static void main(String[] args) {
        ArrayList<String> arr = new ArrayList<String>();
        // add element in arraylist
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");
        // print arraylist
        System.out.println("ArrayList Before Swap is = " + arr);

        /*
         * Swaps the elements at the specified positions in the specified list.
         * (If the specified positions are equal,
           invoking this method leaves the list unchanged.)

          Parameters:

        list The list in which to swap elements.
        i the index of one element to be swapped.
        j the index of the other element to be swapped.

        Throws:

       IndexOutOfBoundsException - if either i or j is out of range (i < 0 || i >= list.size() || j < 0 || j >=
        list.size()).
         */

        Collections.swap(arr, 1, 3);

        System.out.println("ArrayList Before Swap is = " + arr);

    }


}

Output:

ArrayList Before Swap is = [c, php, html, java]

ArrayList Before Swap is = [c, java, html, php]

Create ArrayList In Java

Storing Java Object In ArrayList

How To Copy ArrayList To Array

How to Convert Array to ArrayList

How To Shallow Copy Or Clone a ArrayList

Reverse order of all elements of ArrayList

How to add all elements of a list to ArrayList

Swap elements of Java ArrayList example

Remove All Element From Arraylist Example

how To Remove Element of arraylist

How to Remove List From Arraylist

How to get sub list from ArrayList