while

while (condition) {
 
//command
 
}

a while loop do something while a condition

package codereferececomjava;
 
public class CodeRefereceComJava {
 
    public static void main(String[] args) {
 
        int i=4;
 
        while(i==4) {
 
             i++;
         }
 
        System.out.println("i is :" + i );
    }
}

  i is :5