JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to iterate through collection objects?


Description:

You can iterate through any collection object by using Iterator object. It provides two methods to iterate. The hasNext() method returns true if the iteration has more elements. The next() method returns the next element in the iteration. Below example shows how to iterate through an ArrayList.


Code:
package com.java2novice.iterator;

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

public class MyCollectionIterator {

	public static void main(String a[]){
		
		List<String> myList = new ArrayList<String>();
		myList.add("Java");
		myList.add("Unix");
		myList.add("Oracle");
		myList.add("C++");
		myList.add("Perl");
		Iterator<String> itr = myList.iterator();
		while(itr.hasNext()){
			System.out.println(itr.next());
		}
	}
}

Output:
Java
Unix
Oracle
C++
Perl
 Next Program >>

List Of Iterator Sample Programs:

  1. How to iterate through collection objects?
  2. How to remove an element from collection using Iterator object?
Knowledge Centre
Difference between while and do-while
The while statement verifies the condition before entering into the loop to see whether the next loop iteration should occur or not. The do-while statement executes the first iteration without checking the condition, it verifies the condition after finishing each iteration. The do-while statement will always execute the body of a loop at least once.
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-- William Shakespeare

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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