While
while(condition){
//do your job
}
do…while
do{
//do your job
}while(condition);
the difference:
do-whileStatement inleastWill loop once, butwhileAs long as the condition is not satisfied, the internal statement will not be executed
Give an example of while:
public static void testWhile() {
int i = 10;
while (i > 10) {
System.out.print(i + " ");
i--;
}
}
上面这段代码没有任何输出,证明只要condition不满足不会执行内部语句
Give an example of do...while:
int i = 1; int sum = 0;
do {
sum += i++; //等于 sum=sum+i;i=i+1;
} while(i <= 10);
System.out.printf("%d, %d\n", i, sum);
输出:i=11 sum=55
Give an example of do...while:
public static void testDoWhile() {
int i = 10;
do {
System.out.print(i + " ");
i--;
} while (i > 10);
}
输出:10
上面的输出证明虽然condition不满足但是do-while内部语句还是执行了一次