切换布尔值，但只切换一次？（java）

发布于 2024-12-02 18:11:25 字数 648 浏览 1 评论 0原文

有时需要在循环中只存储一次布尔值（以记录它从 false 变为 true，反之亦然），同时将循环执行到最后，但不再关心布尔值的变化价值。示例：


    public static boolean dbDelete(Collection argObjectCollectionToDelete) {
        boolean result = true;
        for (Object object : argObjectCollectionToDelete) {
            boolean dbDelete = dbDelete(object);
            if (!dbDelete) {
                result = false;
            }
        }
        return result;
    }

是否有某种方法可以执行等效的代码


if (!dbDelete) {
    result = false;
}

或


if (!dbDelete && !result) {
    result = false;
}

以更优雅的方式（最好是在一行中）？

原文

Every now and then there is a need to store a boolean value only once (to record that it has changed from false to true or vice versa) in a loop, while executing the loop to the end but not caring anymore about changes in the boolean value. Example:


    public static boolean dbDelete(Collection argObjectCollectionToDelete) {
        boolean result = true;
        for (Object object : argObjectCollectionToDelete) {
            boolean dbDelete = dbDelete(object);
            if (!dbDelete) {
                result = false;
            }
        }
        return result;
    }

Is there some way to execute the equivalent of the code


if (!dbDelete) {
    result = false;
}


if (!dbDelete && !result) {
    result = false;
}

in a more elegant way, preferrably in one line?

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心如狂蝶 2024-12-09 18:11:25

怎么样：

result &= dbDelete(object);

这相当于：

result = result & dbDelete(object);

所以只有当 result 之前为 true 并且 dbDelete 返回 true 时，它才为 true。

How about:

result &= dbDelete(object);

This is equivalent to:

result = result & dbDelete(object);

So it will only be true if result was previously true and dbDelete returned true.

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贱贱哒 2024-12-09 18:11:25

if (!dbDelete(object)) {
    result = false;
}

if (!dbDelete(object)) {
    result = false;
}

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暗地喜欢 2024-12-09 18:11:25

结果 = dbDelete(对象) ?结果：假；

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苍景流年 2024-12-09 18:11:25

尝试为变量名称赋予更多含义 - 这会让事情变得更容易。

public static boolean dbDelete(Collection argObjectCollectionToDelete) {
    boolean completedSuccessfully = true;
    for (Object object : argObjectCollectionToDelete) {
        boolean dbDelete = dbDelete(object);
        if (completedSuccessfully && !dbDelete) {  //won't change anymore after failure
            completedSuccessfully = false;
        }
    }
    return completedSuccessfully;
}

Try putting more meaning into your variable names - it makes things easier.

public static boolean dbDelete(Collection argObjectCollectionToDelete) {
    boolean completedSuccessfully = true;
    for (Object object : argObjectCollectionToDelete) {
        boolean dbDelete = dbDelete(object);
        if (completedSuccessfully && !dbDelete) {  //won't change anymore after failure
            completedSuccessfully = false;
        }
    }
    return completedSuccessfully;
}

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~没有更多了~