反射不打印类中的构造函数名称

Question

I am trying to get the constructor name printed using reflection however its skipping the loop which is for printing the name of loop.

package reflection.com;

import java.lang.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

abstract interface FirstInterface {

    void showFirstInterface();
}

abstract interface SecondInterface {

    void showSecondInterface();
}

abstract interface ThirdInterface {

    void showThirdinterface();
}

class SuperClass implements FirstInterface {

    int x, y, z;

    SuperClass() {
        System.out.println("Super Class Constructor...");
    }

    public void showFirstInterface() {
        System.out.println("In class Super Class....");
    }
}

public class SubClass extends SuperClass implements SecondInterface, ThirdInterface {

    int a, b, c;

    SubClass() {
    }

    SubClass(int a, int b, int c) {

    }

    public void showSecondInterface() {
        System.out.println("In class Sub Class implementing Second Interface...");

    }

    public void showThirdinterface() {

        System.out.println("In class Sub Class implementing Third Interface...");
    }
}

class ReflectionTest {

    public static void main(String[] args) {
        Class class1 = SubClass.class;
        int modifier = class1.getModifiers();
        Class superClass = class1.getSuperclass();
        Class[] interfaces = class1.getInterfaces();
        Constructor[] constructor = class1.getConstructors();
        Method[] method = class1.getMethods();
        Field[] field = class1.getFields();
        System.out.println("Fully Qualified Class Name..." + class1.getName());
        System.out.println("Class Name..." + class1.getSimpleName());
        System.out.println("Class Modifier...." + Modifier.isPublic(modifier));
        System.out.println("Class Super Class....." + superClass.getName());
        System.out.println("Following are the interfaces.....");
        for (int i = 0; i < interfaces.length; i++) {
            System.out.println(interfaces[i].getName());
        }
        System.out.println("Following are the Constructor.....");
        for (int i = 0; i < constructor.length; i++) {
            System.out.println(constructor[i].getName());
        }
        System.out.println("Following are the Fields.....");
        for (int i = 0; i < field.length; i++) {
            System.out.println(field[i].getName());
        }
        System.out.println("Following are the Methods.....");
        for (int i = 0; i < method.length; i++) {
            System.out.println(method[i].getName());
        }
        for (Method method1 : method) {
            System.out.println(method1.getName());
        }
    }
}

I tried to debug the application but no use its not going into the for loop itself.

Can anyone help me with this?

Answer 1

From the documentation for getConstructors() [emphasis mine]:

Returns an array containing Constructor objects reflecting all the public constructors of the class represented by this Class object.

Your class doesn't have any public constructors. The two constructors are package-private:

public class SubClass ... {
    SubClass() {}
    SubClass(int a, int b, int c) {}