Simpler method to autobox / cast a Long to int in java

Question

I've the following code in Java:

void foo(int a) { ... }

void bar() {
    Long x = 42;
    foo(x);  // Compile error: "Method foo(int)   
             // is not applicable for the argument (long)"
    foo((long) x); // Same as before
    foo((int) x); // Compile error: "Cannot cast Long to int"
    foo((int) (long) x);  // OK, but strange and confusing
}

Is there a better way?

Answer 1

如果你有一个Long对象，你可以调用intValue()方法来获得一个int 。

Answer 2

声明你的x是long，而不是long，你可以直接转换为（int）