Java 在 do while 循环中不等于
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Not equal to in a do while loop
提问by user2650277
For some reason a sentinel value will not work as expected
由于某种原因，哨兵值不会按预期工作
public static int play() {
String input;int result;
do {
input = JOptionPane.showInputDialog("Do you want to play-Enter 1 if yes , 0 if no");
result = Integer.parseInt(input);
} while (result != 1 || result != 0);
return result;
}
This code above never works but it works just fine if i change the condition from while (result != 1 || result != 0);to while (result < 0 || result > 1);
上面的代码从不工作，但如果我将条件从 更改while (result != 1 || result != 0);为while (result < 0 || result > 1);
Why is that so and how can i make not equal work in a do...whileloop in java ?
为什么会这样，我如何才能do...while在 java的循环中进行不相等的工作？
Thanks
谢谢
采纳答案by Victor2748
Use:
用：
while (result != 1 && result != 0) {...}
This will execute the code, ONLY if resultis NOT 0or 1
这将执行代码，仅当result不是0或1
In your example, the boolean statement in the whileloop will ALWAYS be equal to truebecause result can be equal to only 1 value:
在您的示例中，while循环中的布尔语句将始终等于，true因为结果只能等于 1 个值：
while (result != 0 || result != 1)
If resultis 1, then it is not equal to 0, if it is 0, then it can't be 1, so it will ALWAYS be true
如果result是1，那么它不等于0，如果是0，那么它不可能是1，所以它永远是true
回答by Peadar ó Duinnín
while (result != 1 || result != 0)
while (result != 1 || result != 0)
This condition means it will always loop even with '1' or '0' as a response:
这种情况意味着即使使用“1”或“0”作为响应，它也将始终循环：
If the user enters 0, which should be valid, it will satisfy result != 1and return true.
如果用户输入 0，这应该是有效的，它将满足result != 1并返回true。
If the user enters 1, which should be valid, it will satisfy result != 0and return true.
如果用户输入 1，这应该是有效的，它将满足result != 0并返回true。
You need to use while (result != 1 && result != 0).
您需要使用while (result != 1 && result != 0).
This will loop only if the answer is both not equals to 1 and not equals to 0.
仅当答案既不等于 1 又不等于 0 时才会循环。
