From 631909e68ad9d84eae9ec685025466fa512a4ec4 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Wed, 1 Apr 2026 15:24:46 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day12-=E5=8F=8D=E5=B0=84?=
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---
 .../inmind/refelct02/ConstructorDemo04.java   | 80 +++++++++++++++++++
 .../src/com/inmind/refelct02/Student.java     | 30 +++++++
 2 files changed, 110 insertions(+)
 create mode 100644 javaSE-day12/src/com/inmind/refelct02/ConstructorDemo04.java

diff --git a/javaSE-day12/src/com/inmind/refelct02/ConstructorDemo04.java b/javaSE-day12/src/com/inmind/refelct02/ConstructorDemo04.java
new file mode 100644
index 0000000..bc9311d
--- /dev/null
+++ b/javaSE-day12/src/com/inmind/refelct02/ConstructorDemo04.java
@@ -0,0 +1,80 @@
+package com.inmind.refelct02;
+
+import org.junit.Test;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+/*
+反射操作构造器(创建对象)
+Class Constructor<T>
+
+总结：
+    构造器如何获取呢？？
+    Class对象的2个API：
+        getConstructor：获取public的构造器
+        getDeclaredConstructor：获取所有定义过的构造器
+    构造器的作用：创建对象
+        constructor.setAccessible(true);
+        Object o = constructor.newInstance("张三", 18);
+ */
+public class ConstructorDemo04 {
+    //普通的构造方法创建学生对象
+    public static void main(String[] args) {
+        Student student = new Student();
+        System.out.println(student);
+    }
+
+    //使用反射API来创建学生对象
+    @Test
+    public void method1() throws ClassNotFoundException, InstantiationException, IllegalAccessException {
+        //获取Class
+        Class<?> clazz = Class.forName("com.inmind.refelct02.Student");
+        //Class的newInstance()的功能：底层调用的就是指定类的无参构造方法，从而创建出对象
+        Object o = clazz.newInstance();
+        System.out.println(o instanceof Student);
+        System.out.println(o);
+    }
+
+    //获取无参构造方法对象(构造器)，创建出学生对象
+    @Test
+    public void method2() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
+        //获取Class
+        Class<?> clazz = Class.forName("com.inmind.refelct02.Student");
+        /*
+        获取构造器对象
+        Constructor<?>[] getConstructors() 返回一个包含 Constructor对象的数组， Constructor对象反映了由该 Class对象表示的类的所有公共构造函数。
+        Constructor<T> getConstructor(Class<?>... parameterTypes) 返回一个 Constructor对象，该对象反映由该 Class对象表示的类的指定公共构造函数。
+         */
+        Constructor<?> constructor = clazz.getConstructor();
+        /*
+        通过指定构造器，创建出学生对象
+        public T newInstance(Object ... initargs),initargs就是对应构造器的参数，如果有就传入
+         */
+        Object o = constructor.newInstance();
+        System.out.println(o);
+    }
+
+    //获取私有满参构造方法对象(构造器)，创建出学生对象
+    @Test
+    public void method3() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
+        //获取Class
+        Class<?> clazz = Class.forName("com.inmind.refelct02.Student");
+        /*
+        获取满参的构造器对象
+        Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) 返回一个 Constructor对象。
+         */
+        //getDeclaredConstructor:可以获取Class中定义的所有的构造方法，包含私有构造方法
+        Constructor<?> constructor = clazz.getDeclaredConstructor(String.class, int.class);
+
+        //暴力反射，修改对应构造器的访问权限
+        constructor.setAccessible(true);
+        /*
+        通过满参的构造器对象，创建出学生对象
+        public T newInstance(Object ... initargs),initargs就是对应构造器的参数，如果有就传入
+         */
+        Object o = constructor.newInstance("张三", 18);
+        System.out.println(o instanceof Student);
+        System.out.println(o);
+    }
+}
diff --git a/javaSE-day12/src/com/inmind/refelct02/Student.java b/javaSE-day12/src/com/inmind/refelct02/Student.java
index 4476341..a8ffbc1 100644
--- a/javaSE-day12/src/com/inmind/refelct02/Student.java
+++ b/javaSE-day12/src/com/inmind/refelct02/Student.java
@@ -1,5 +1,35 @@
 package com.inmind.refelct02;
 
 public class Student {
+    //属性（成员变量）
+    String name;
+    int age;
 
+    //无参构造方法
+    public Student() {
+    }
+
+    //满参构造方法
+    private Student(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    //行为（成员方法）
+    public void show(){
+        System.out.println("无参无返回值的show方法执行了");
+    }
+
+    private int show(int i){
+        System.out.println("有参有返回值的show方法执行了");
+        return i+100;
+    }
+
+    @Override
+    public String toString() {
+        return "Student{" +
+                "name='" + name + '\'' +
+                ", age=" + age +
+                '}';
+    }
 }