A while loop is a control structure that allows you to repeat a task a certain number of times.

The syntax of a while loop is:

While(condition){
  //statements;
}

A do...while loop is similar to a while loop, except that a do...while loop is guaranteed to execute at least once.

The syntax of a do...while loop is as follows:

do { 
  //statements;
} while(condition);

A for loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times. A for loop is useful when you know how many times a task is to be repeated.

The syntax of a for loop is as follows:

for(initialization; condition; update)
{ 
  //statements;
}

An example of a for loop is as follows:

package MyFirstPackage;
public class Loop {
  public static void main(String[] args) {
    for (int i = 0 ; i <= 10 ; i ++ ){
      System.out.println(i);
  }
  }
}

The output for the preceding code is as follows:

0
1
2
3
4
5
6
7
8
9
10

for(declaration : expression) 
{ 
  //statements;
}