Example of a for loop:


public class Factorial {
	
	public static void main(String[] args) {
	    int n = 4; // compute the factorial of n
	    int fact = 1; // initial value
	    for(int i = 1; i <= n; i++) {
		fact = fact * i; // loop body
	    }

	    System.out.println("factorial of " + n + " is " + fact);
	}
 
}

This loop is exactly the same as this 'while' loop:


public class Factorial {
	
	public static void main(String[] args) {
	    int n = 4; // compute the factorial of n
	    int fact = 1; // initial value
	    int i = 1; // initialization
	    while (i <= n) {
		fact = fact * i; // loop body
		i++;  // increment
	    }

	    System.out.println("factorial of " + n + " is " + fact);
	}
 
}

This is an example from CSci 2101 course.