Difference between do while and while

1  package com.ibeve.demo;
 2  
3  public  class WhileDemo {
 4      public  static  void main(String[] args) {
 5  
6          /** 
7           * Define initialization expression; while(conditional expression) { loop body (execute statement ) }
 8           */ 
9          int x = 1 ;
 10          // while (x < 13) {
 11          // System.out.println("x=" + x);
 12          // x = x + 2;
 13          // } 
14  
15          do {
 16              System.out.println("do : x=" +x);
 17              x++ ;
 18          } while (x < 0 );
 19  
20          int y = 1 ;
 21          while (y < 0 ) {
 22              System.out.println("y=" + y);
 23              y++ ;
 24          }
 25  
26          /** 
27           * while: Judge the condition first, and execute the loop body only if the condition is met.
28           * do while: execute the loop body first, then judge the condition, if the condition is satisfied, then continue to execute the loop body.
29           * Simple sentence: do while The body of the loop is executed at least once regardless of whether the condition is met or not.
30           */ 
31      }
 32 }