test reflection

Base.java

package com.test;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

class Base {

    void testReflection() {
        try {
            Method method = this.getClass().getDeclaredMethod("subMethod", Integer.TYPE);

            method.setAccessible(true);

            System.out.println(method.invoke(this, 1));

        } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}

Runner.java

package com.test;

public class Runner {

    public static void main(String[] args) {
        Base instance = new Sub();

        instance.testReflection();
    }
}

Sub.java

package com.test;

class Sub extends Base {

    private int subMethod(int a) {
        System.out.println(a);
        return a+1;
    }
}