Java - Decision Control and looping statement - For Tutorial

For loop

The Java for loop is used When you exactly know how many times the loop should be executed.

For example- Suppose you want to execute “hello” three-time

public class forloop 
{
public static void main(String[] args) 
{
for (int i = 0; i < 3; i++) 
{//Starting from i=0,0<3 true,then i=1,1<3 true, then i=2,2<3
System.out.println("Hello");
}
}
}

Run Program

Program explanation-

It Checks for a condition if it is true or not.

My value is set to 0, 0 is less than 3, hence it will print 1^st Hello.

I value get incremented by 1,making it i=0+1=1

I=1 is less than 3, true, hence it will print 2^nd Hello.

I value get incremented again by 1, making it i=1+1=2

I=2 is less than 3, true, hence it will print 3^rd Hello.

I value get incremented again by 1, making it i=2+1=3

I=3 is not less than 3, false, hence the loop will stop.

For-each Loop

This loop will not check the condition, it will print each statement in the array.

public class ForEachLoop 
{
public static void main(String[] args) 
{
int[] value = {1,2,3,4};
for (int i : value) 
{
System.out.println(i);
}
}
}

Run Program