Finding most specific overloaded method using MethodHandle

Question

Suppose I have three methods inside a given type (class/interface):

public void foo(Integer integer);
public void foo(Number number);
public void foo(Object          


        

Answer 1

You can use MethodFinder.findMethod() to achieve it.

@Test
public void test() throws Exception {
    Foo foo = new Foo();

    Object object = 3L;
    Method method = MethodFinder.findMethod(Foo.class, "foo", object.getClass());
    method.invoke(foo, object);
}


public static class Foo {
    public void foo(Integer integer) {
        System.out.println("integer");
    }

    public void foo(Number number) {
        System.out.println("number");
    }

    public void foo(Object object) {
        System.out.println("object");
    }
}

Since it is in java root library, it is following JLS 15.12.