java - 方法参数顺序的改变能叫方法重载吗？

Question

请注意，在下面的示例中仅更改了参数的顺序。所以我的问题是 - 我们可以调用下面的示例是方法重载吗？

public void show(String s, int a){
    System.out.println("Test.show(String, int)");
}
public void show(int s, String a){
    System.out.println("Test.show(int, String)");
}

Answer 1

是的，这绝对是方法重载。

来自 section 8.4.9 of the JLS :

If two methods of a class (whether both declared in the same class, or both inherited by a class, or one declared and one inherited) have the same name but signatures that are not override-equivalent, then the method name is said to be overloaded.

“覆盖等效”在 section 8.4.2 中描述:

Two methods have the same signature if they have the same name and argument types.

[ ... Details on "same argument types ... ]

The signature of a method m1 is a subsignature of the signature of a method m2 if either:

• m2 has the same signature as m1, or

• the signature of m1 is the same as the erasure (§4.6) of the signature of m2.

Two method signatures m1 and m2 are override-equivalent iff either m1 is a subsignature of m2 or m2 is a subsignature of m1.