用反射机制调用Java的私有方法

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


public class StrTest {

	public static void main(String args[]) {
		try {
			PrivateMethodClass a = new PrivateMethodClass();
			Method m = PrivateMethodClass.class.getDeclaredMethod("print");
			m.setAccessible(true);
			try {
				m.invoke(a);
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (IllegalArgumentException e) {
				e.printStackTrace();
			} catch (InvocationTargetException e) {
				e.printStackTrace();
			}
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

class PrivateMethodClass
{
	private void print()
	{
		System.out.println("I am private method");
	}
}

 输出：I am private method.