使用JAVA的反射机制反射带有数组参数的私有方法

借了网上一位仁兄的例子，改了改。

直接上代码：

package reflect;
public class PlainJavaClass {
	public int a = 2;
	public int b = 3;
	public PlainJavaClass() {
	}
	public PlainJavaClass(int a, int b) {
		this.a = a;
		this.b = b;
	}
	public int add() {
		return a + b;
	}
	public int plus(int[] a, int b) {
		return a[0] - b;
	}
}

package reflect;
import java.lang.reflect.*;
public class ReflectJavaClass {
	public void invokePlain() {
		Class Plain = null;
		Method add = null;
		Method plus = null;
		Class[] plusPara = { int[].class, int.class };
		int[] in = { 30, 50 };
		Object[] transPlusPara = { in, 20 };
		Object addReturnObj = null;
		Object plusReturnObj = null;
		try {
			Plain = Class.forName("reflect.PlainJavaClass");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
			return;
		}
		try {
			add = Plain.getDeclaredMethod("add", null);
			plus = Plain.getDeclaredMethod("plus", plusPara);
		} catch (SecurityException e) {
			e.printStackTrace();
			return;
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
			return;
		}
		try {
			addReturnObj = add.invoke(new PlainJavaClass(5, 2), null);
			plusReturnObj = plus.invoke(new PlainJavaClass(), transPlusPara);
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
			return;
		} catch (IllegalAccessException e) {
			e.printStackTrace();
			return;
		} catch (InvocationTargetException e) {
			e.printStackTrace();
			return;
		}
		Integer addReturnValue = (Integer) addReturnObj;
		Integer plusReturnValue = (Integer) plusReturnObj;
		System.out.println("return value :" + addReturnValue);
		System.out.println("return value :" + plusReturnValue);
	}
	public static void main(String[] args) {
		new ReflectJavaClass().invokePlain();
	}
}