奇怪的循环输出 - Java

Question

Wy是这些循环:

while (x <= gridWidth) {
            while (y <= gridHeight) {
                System.out.println("X: " + x + ", Y: " + y);
                y++;
            }
            x++;
        }

输出这个:

    X: 0, Y: 0
    X: 0, Y: 1
    X: 0, Y: 2
    X: 0, Y: 3
    X: 0, Y: 4
    X: 0, Y: 5
    X: 0, Y: 6
    X: 0, Y: 7
    X: 0, Y: 8
    X: 0, Y: 9
    X: 0, Y: 10
    X: 0, Y: 11
    X: 0, Y: 12
    X: 0, Y: 13
    X: 0, Y: 14
    X: 0, Y: 15
    X: 0, Y: 16
    X: 0, Y: 17
    X: 0, Y: 18
    X: 0, Y: 19
    X: 0, Y: 20
    X: 0, Y: 21
    X: 0, Y: 22
    X: 0, Y: 23
    X: 0, Y: 24
    X: 0, Y: 25
    X: 0, Y: 26
    X: 0, Y: 27
    X: 0, Y: 28
    X: 0, Y: 29
    X: 0, Y: 30
    X: 0, Y: 31
    X: 0, Y: 32
    X: 0, Y: 33
    X: 0, Y: 34
    X: 0, Y: 35
    X: 0, Y: 36
    X: 0, Y: 37
    X: 0, Y: 38
    X: 0, Y: 39
    X: 0, Y: 40
    X: 0, Y: 41
    X: 0, Y: 42
    X: 0, Y: 43
    X: 0, Y: 44
    X: 0, Y: 45
    X: 0, Y: 46
    X: 0, Y: 47
    X: 0, Y: 48
    X: 0, Y: 49
    X: 0, Y: 50

？

我很确定gridWidth = 50,因为我打印了它.

Answer 1

您需要y在嵌套循环开始之前重置为零.否则,外部循环将执行50次,但内部循环的最后49次将根本不执行,因为y已经在上面gridHeight.