JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java ListIterator Sample Code

Description:

Using ListIterator, we can iterate all elements of a list in either direction. You can access next element by calling next() method, and also you can access previous element by calling previous() method on the list.


Code:
package com.myjava.listiterator;

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

public class MyListIterator {
    public static void main(String a[]){
        List<Integer> li = new ArrayList<Integer>();
        ListIterator<Integer> litr = null;
        li.add(23);
        li.add(98);
        li.add(29);
        li.add(71);
        li.add(5);
        litr=li.listIterator();
        System.out.println("Elements in forward directiton");
        while(litr.hasNext()){
            System.out.println(litr.next());
        }
        System.out.println("Elements in backward directiton");
        while(litr.hasPrevious()){
            System.out.println(litr.previous());
        }
    }
}

Example Output

Elements in forward directiton
23
98
29
71
5
Elements in backward directiton
5
71
29
98
23

List Of Collection Classes Sample Programs:


List Of Util Classes Sample Programs:

Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
Famous Quotations
You can never get enough of what you don’t really need.
-- Eric Hoffer

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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