Java反射機制(得到所有的構造方法)

Person

 

package org.lxh.demo.classdemo04;

interface Info {
 public static final String AUTHOR = “MLDN”;

 public String getInfo();

 public String say(String name, String content);

 public void sayHello();
}

public class Person implements Info {
 private String name;
 private int age;

 public Person() {//無參構造方法
 }

 public Person(String name) {
  this.setName(name);
 }

 public Person(String name, int age) {
  this(name);
  this.setAge(age);
 }

 public String getInfo() {
  return “Hello World!!!”;
 }

 public String say(String name, String content) {
  return name + “說了：” + content;
 }

 public void sayHello() {
  System.out.println(“hello –> ” + AUTHOR);
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public int getAge() {
  return age;
 }

 public void setAge(int age) {
  this.age = age;
 }

 public String toString() {
  return “姓名：” + this.name + “；年齡：” + this.age;
 }
}

GetConstructorDemo02

package org.lxh.demo.classdemo04;

import java.lang.reflect.Constructor;

public class GetConstructorDemo02 {

 public static void main(String[] args) throws Exception {
  Class<?> c = Class.forName(“org.lxh.demo.classdemo04.Person”);
  Constructor<?> con[] = c.getConstructors(); // 得到全部構造
  for (int i = 0; i < con.length; i++) {
   int mod = con[i].getModifiers(); // 得到修飾符
   Class<?> param[] = con[i].getParameterTypes(); // 得到全部的引數
   System.out.print(mod + ” “); // 輸出內容
   System.out.print(con[i].getName() + ” (“);
   for (int x = 0; x < param.length; x++) {
    System.out.print(param[x].getName() + ” arg-” + x);
    if (x < param.length – 1) {
     System.out.print(“,”);
    }
   }
   System.out.println(“)”);
  }
 }
}

 

 

GetConstructorDemo03

package org.lxh.demo.classdemo04;

import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;

public class GetConstructorDemo03 {

 public static void main(String[] args) throws Exception {
  Class<?> c = Class.forName(“org.lxh.demo.classdemo04.Person”);
  Constructor<?> con[] = c.getConstructors(); // 得到全部構造
  for (int i = 0; i < con.length; i++) {
   int mod = con[i].getModifiers(); // 得到修飾符
   String str = Modifier.toString(mod);// 還原許可權
   Class<?> param[] = con[i].getParameterTypes(); // 得到全部的引數
   System.out.print(str + ” “); // 輸出內容
   System.out.print(con[i].getName() + ” (“);
   for (int x = 0; x < param.length; x++) {
    System.out.print(param[x].getName() + ” arg-” + x);
    if (x < param.length – 1) {
     System.out.print(“,”);
    }
   }
   System.out.println(“)”);
  }
 }
}