Iterator in java
Iterator is like a loop. It iterates the variable using the object.
Example-1
import java.util.ArrayList;
import java.util.Iterator;
public class Main
{
public static void main(String[] args)
{
ArrayList<Integer> num = new ArrayList<Integer>();
num.add(10);
num.add(20);
num.add(30);
Iterator it = num.iterator();
System.out.println(it.next());
}
}
Output
10
Example-2
import java.util.ArrayList;
import java.util.Iterator;
public class Main
{
public static void main(String[] args)
{
ArrayList<Integer> num = new ArrayList<Integer>();
num.add(10);
num.add(20);
num.add(30);
Iterator it = num.iterator();
System.out.println(it.next());
System.out.println(it.next());
System.out.println(it.next());
}
}
Output
10 20 30
Example-3
import java.util.ArrayList;
import java.util.Iterator;
public class Main
{
public static void main(String[] args)
{
ArrayList<Integer> num = new ArrayList<Integer>();
num.add(10);
num.add(20);
num.add(30);
Iterator it = num.iterator();
while(it.hasNext())
{
System.out.println(it.next());
}
}
}
Output
10 20 30