Can java get method with methodname through reflections

Question

I know Java can get Method Object using the Reflection.getMethod(...) method，but the method needs method parameter types。 but I don't know the exact parameter type。e.g.

byte a = 20;
System.out.println(a);

the println method hasn't the overload method println(Byte)，but has println(Int)。 How to get the println method through the byte type？ the other example

class MyClass
{
}
class MyClass1 extends MyClass
{
}
class TestClass
{
    public static void method1(MyClass c)
    {
        ... ...
    }
}

TestClass.method1(new MyClass1()) is correct.but can i get the method1 through parameter type MyClass1 ?

Class.getMethods will get all method in Class， too much。 can i get all overload method same name？

DNA · Accepted Answer · 2014-03-03 13:00:49Z

2

java.lang.Class (see JavaDoc) provides two ways of finding methods:

Method getMethod(String name, Class<?>... parameterTypes)

and

Method[] getMethods()

(and corresponding getDeclaredMethod() variants).

So there's no API in the standard Java library for directly getting what you need - you'll need to get all methods, filter the ones with the right name, then inspect the parameter types.

Or you may be able to find a 3rd-party library that will do this for you. For example, the reflections library has a getMethodsMatchParams(Class<?>... types) method.

The jOOR library also provides various methods for finding methods with "similar" signatures.

edited Mar 3, 2014 at 13:00

answered Mar 3, 2014 at 12:38

DNA

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