Java – how to use reflection to tell a method to have a varargs parameter?

This is a sample code

package org.example;

import java.lang.reflect.Method;

class TestRef {

        public void testA(String ... a) {
                for (String i : a) {
                        System.out.println(i);
                }
        }

        public static void main(String[] args){

                Class testRefClass = TestRef.class;

                for (Method m: testRefClass.getmethods()) {
                        if (m.getName() == "testA") {
                                System.out.println(m);
                        }
                }
        }
}

Output is

public void org.example.TestRef.testA(java.lang.String[])

Therefore, the signature of the method is reported in a string array

Is there any meaning in the reflection library that I can tell that the method was originally declared to adopt varargs?

Solution

yes. java. lang.reflect. Method. isVarArgs().

However, if you try to assemble and display method signatures in human readable form, use this option only If you need to call the varargs method using reflection, you must assemble the varargs parameter into an array type parameter