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Nested class in Java
1 Answer(s)      9 years ago
Posted in : Java Beginners

What is a nested class in Java?


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April 9, 2008 at 6:13 PM

Hi Friend,

I understand ur prob, so that I am sending u coding for nested class.
Please let me know for further help.
Hope it will help u.

public class DataStructure {
private final static int size = 20;
private int[] array = new int[size];

public DataStructure(){
//fill the array with ascending integer values
for (int i = 0; i < size; i++) {
array[i] = i;

public void EvenValue() {
//print out values of even indices of the array
InnerEvenIterator iterator = InnerEvenIterator();
while (iterator.hasNext()) {
System.out.println(iterator.getNext() + " ");

private class InnerEvenIterator {
private int next = 0;
public boolean hasNext() {
//check if a current element is the last in the array
return(next <= size - 1);
public int getNext() {
//record a value of an even index of the array
int retValue = array[next];
//get the next even element
next += 2;
return retValue;

public static void main(String s[]) {
//fill the array with integer values and print out only values of even indices
DataStructure data = new DataStructure();


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