“引发新异常”之间的区别在于:和“新异常”? [英] Difference between "throw new Exception" and "new Exception"?

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问题描述

我想知道使用抛出新的Exception() new Exception()的最佳实践。如果使用 new Exception(),我已经看到代码移至下一条语句,而不是抛出异常。

I am interested to know best practice to use throw new Exception() and new Exception(). In case of using new Exception(), I have seen that code moves to next statement instead of throwing exception.

但是我被告知应该使用 new Exception()引发 RuntimeException

But I am told that we should use new Exception() to throw RuntimeException.

任何人都可以对此发表看法吗?

Can anyone throw some light on this ?

推荐答案

new Exception()表示创建一个实例(与创建新的Integer(...)相同)
,但是除非抛出它...

new Exception() means create an instance (same as creating new Integer(...)) but no exception will happen until you throw it...

请考虑以下代码段:

public static void main(String[] args) throws Exception {
    foo(1);
    foo2(1);
    }

    private static void foo2(final int number) throws Exception {
    Exception ex;
    if (number < 0) {
        ex = new Exception("No negative number please!");
        // throw ex; //nothing happens until you throw it
    }

    }

    private static void foo(final int number) throws Exception {
    if (number < 0) {
        throw new Exception("No negative number please!");
    }

    }

方法foo()将抛出如果参数为负但
则为异常,如果参数为负,则foo2()方法将创建异常的实例

the method foo() will THROW an exception if the parameter is negative but the method foo2() will create an instance of exception if the parameter is negative

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