do {
    //代码语句
}while(布尔表达式);

int sum=0;
int i=1;
do{
sum+=i;
i++;
} while (i<=100);
System.out.println("1到100之间所有整数的和是: "+sum);

public class Test {

  public static void main(String args[]){
   int x = 10;

   do{
     System.out.print("value of x : " + x );
     x++;
     System.out.print("\n");
   }while( x < 20 );
  }
}

value of x : 10
value of x : 11
value of x : 12
value of x : 13
value of x : 14
value of x : 15
value of x : 16
value of x : 17
value of x : 18
value of x : 19