S_a_k_Uの日記みたいなDB

~サクゥーと呼ばないで~

継承元のクラスのgetDeclaredMethodで取得したPrivateメソッドは?

やっぱり滑りに行った帰りに、ふと思ってみたので確認。

import java.io.Serializable;
import java.lang.reflect.Method;

public class ReflectTest3 implements Serializable {
    private static final long serialVersionUID = -6049702009069313042L;
    protected int value = 0;
    public void writePublic() {
        System.out.println("ReflectTest3#writePublic/"+ this.value);
    }
    protected void writeProtected() {
        System.out.println("ReflectTest3#writeProtected/" + this.value);
    }
    private void writePrivate() {
        System.out.println("ReflectTest3#writePrivate/" + this.value);
    }
    public static void main(String[] args) {
        new ReflectTest3().test();
    }
    public void test() {
        try {
            ReflectTest3A testA = new ReflectTest3A();
            Method writePublicMethod = ReflectTest3.class.getDeclaredMethod("writePublic", (Class[]) null);
            writePublicMethod.invoke(testA, (Object[]) null);
            Method writeProtectedMethod = ReflectTest3.class.getDeclaredMethod("writeProtected", (Class[]) null);
            writeProtectedMethod.invoke(testA, (Object[]) null);
            Method writePrivateMethod = ReflectTest3.class.getDeclaredMethod("writePrivate", (Class[]) null);
            writePrivateMethod.invoke(testA, (Object[]) null);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public class ReflectTest3A extends ReflectTest3 {
        private static final long serialVersionUID = -6651000889570196353L;
        public ReflectTest3A() {
            super();
            this.value = 1;
        }
    }
}

確かに継承元のクラスのインスタンスは存在せんのじゃけぇ、こういう結果になるわな。

ReflectTest3#writePublic/1
ReflectTest3#writeProtected/1
ReflectTest3#writePrivate/1