[JavaSE] reflection-method reflection, javase Reflection Method

[JavaSE] reflection-method reflection, javase Reflection Method

1. How to obtain a method

The method name and the parameter list of the method can only determine a method

2. Method reflection operations

Method. invoke ();

Package com. tsh. reflect; import java. lang. reflect. method; public class ReflectDemo {public static void main (String [] args) {P p = new P (); Class c = P. class; try {Method method = c. getDeclaredMethod ("print", String. class); method. invoke (p, "ssss");} catch (Exception e) {e. printStackTrace () ;}} class P {public void print (int a, int B) {System. out. println (a + B);} public void print (String a) {System. out. println ();}}

This error is reported if the method is private.

Java. lang. IllegalAccessException