JAva反射の基礎操作
2231 ワード
package com.bruce.demo;
import com.bruce.demo.domain.Student;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class Test {
public static void main(String[] args) throws Exception {
try {
Person person = new Person();
Class clazz = person.getClass();
/**
*
*/
Field field = clazz.getDeclaredField("name");
// java private
field.setAccessible(true);
field.set(person, "jack");
System.out.println(person.getName());
/**
*
*/
Method method = clazz.getDeclaredMethod("setTall", int.class);
method.setAccessible(true);
//
method.invoke(person, 178);
System.out.println(person.getTall());
/**
*
*/
Constructor[] cons = clazz.getConstructors();
for (@SuppressWarnings("rawtypes")
Constructor c : cons) {
System.out.println(c + " " + c.getDeclaringClass());
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
package com.bruce.demo;
/**
*
*/
public class Person {
private String name;
private int tall;
public Person() {
}
public Person(String name) {
this.name = name;
}
public Person(int tall) {
this.tall = tall;
}
public Person(String name, int tall) {
this.name = name;
this.tall = tall;
}
public String getName() {
return name;
}
public int getTall() {
return tall;
}
private void setTall(int tall) {
this.tall = Integer.valueOf(tall);
}
@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
", tall=" + tall +
'}';
}
}