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xiachaochao
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1 parent c67a684 commit 2cde907

18 files changed

Lines changed: 354 additions & 3 deletions

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‎JavaBase/.classpath‎

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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
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<classpathentry kind="lib" path="D:/eclipse/log4j-1.2.17.jar"/>
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<classpathentry kind="lib" path="D:/eclipse/lombok.jar"/>
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<classpathentry kind="lib" path="D:/Program Files/eclipse/log4j-1.2.17.jar"/>
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<classpathentry kind="lib" path="D:/Program Files/eclipse/lombok.jar"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎JavaBase/src/com/_520it/reflect/GetConstructorDemo.java‎

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@@ -27,7 +27,7 @@ public static void main(String[] args) throws Exception {
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}
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public static void getOne() throws Exception {
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Class<?> clazz=User.class;//第一种方式
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Class<?> clazz=Person.class;//第一种方式
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//Class<?> clazz1=Class.forName("com._520it.reflect.User");//第二种方式
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//Class<?> clazz2=(new User().getClass());//第三种方式
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System.out.println(clazz);

‎JavaBase/src/com/_520it/reflect/RefectDemo01.java‎

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package com._520it.reflect;
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class Person {
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public Person() {
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System.out.println("无参构造器");
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}
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public Person(String name) {
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System.out.println("含有name的构造器");
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}
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private Person(String name, int age) {
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System.out.println("有参构造器" + name + age);
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}
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public void doWork() {
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System.out.println("doWork方法");
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}
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}
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public class RefectDemo01 {
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public static void main(String[] args) throws Exception {
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// 三种方式获取clazz对象
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//Class<?> c1 = Class.forName("com._520it.reflect.Person");
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//Class<?> c2=Person.class;
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Class<?> c3=(new Person().getClass());
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}
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}

‎JavaBase/src/com/ddb/javacore/annotation/AnnotationProcessor.java‎

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package com.ddb.javacore.annotation;
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import java.lang.reflect.Field;
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public class AnnotationProcessor {
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@SuppressWarnings("deprecation")
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public static void main(String[] args) throws Exception {
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// 得到Class实例
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Class<?> clazz = Person.class;
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// 得到被反射类的一个实例
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Person person = (Person) clazz.newInstance();
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System.out.println("Person 默认值：");
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person.showInfo();
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// 获得所有的字段
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Field[] fields = clazz.getDeclaredFields(); // 不能获取到继承的属性
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// Field[] fields = clazz.getFields(); //可以获取到公开的继承的属性
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/*
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Field[] fields3 =new Field[fields.length+fields2.length];
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System.arraycopy(fields, 0, fields3, 0, fields.length);
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System.arraycopy(fields2, 0, fields3,fields.length, fields2.length);
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如果是需要获取抽象类中的属性，则需要通过获得一个新的数组，将所有的属性值放置在同一个数组中，然后继续遍历
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*/
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for (Field field : fields) {
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// 判断该属性上是否存在HelloWorld注解
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if (field.isAnnotationPresent(HelloWorld.class)) {
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// 获取指定的注解
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HelloWorld annotation = field.getAnnotation(HelloWorld.class);
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System.out.println("HelloWorld注解的值是：" + annotation.value());
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// 打破封装
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field.setAccessible(true);
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// 将注解的值赋给属性值
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field.set(person, annotation.value());
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} /*else if (field.isAnnotationPresent(Default.class)) {
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Default default1 = field.getAnnotation(Default.class);
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System.out.println("Default注解的值是：" + default1.value());
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field.setAccessible(true); // 获取字段的数据类型
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System.out.println(field.getType().getSimpleName().toString());
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switch (field.getType().getSimpleName().toString()) {
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case "int":
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field.set(person, Integer.valueOf(default1.value()));
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break;
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case "double":
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field.set(person, Double.valueOf(default1.value()));
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break;
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case "String":
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field.set(person, default1.value());
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break;
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default:
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break;
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}
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}*/
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}
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System.out.println("注解后的值：");
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person.showInfo();
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}
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}

‎JavaBase/src/com/ddb/javacore/annotation/Default.java‎

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package com.ddb.javacore.annotation;
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import static java.lang.annotation.ElementType.FIELD;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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import java.lang.annotation.Retention;
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import java.lang.annotation.Target;
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@Retention(RUNTIME)
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@Target(FIELD)
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public @interface Default {
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public String value() default "";
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}

‎JavaBase/src/com/ddb/javacore/annotation/HelloWorld.java‎

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package com.ddb.javacore.annotation;
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import static java.lang.annotation.ElementType.FIELD;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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import java.lang.annotation.Retention;
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import java.lang.annotation.Target;
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@Retention(RUNTIME)
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@Target(FIELD)
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//@Inherited
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public @interface HelloWorld {
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public String value() default "ZhangSan";
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}

‎JavaBase/src/com/ddb/javacore/annotation/Human.java‎

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package com.ddb.javacore.annotation;
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import lombok.Getter;
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import lombok.Setter;
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@Getter
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@Setter
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public abstract class Human {
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private String name;
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private int age;
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public String toString() {
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return "Human [name=" + name + ", age=" + age + "]";
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}
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}

‎JavaBase/src/com/ddb/javacore/annotation/Person.java‎

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package com.ddb.javacore.annotation;
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import lombok.Getter;
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import lombok.Setter;
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@Getter
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@Setter
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public class Person extends Human {
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@Default("12.5")
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private double score = 36.0;
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@HelloWorld("Beijing")
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private String address = "HeFei";
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@Deprecated
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public void showInfo() {
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System.out.println("Person [score=" + score + ",address=" + address + ", toString()=" + super.toString()
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+ ", getName()=" + getName() + ", getAge()=" + getAge() + "]");
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}
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@Override
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public String toString() {
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return "Person [score=" + score + ", toString()=" + super.toString() + ", getName()=" + getName()
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+ ", getAge()=" + getAge() + ", getClass()=" + getClass() + ", hashCode()=" + hashCode() + "]";
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}
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}

‎JavaBase/src/com/ddb/javacore/annotation/TestDemo.java‎

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package com.ddb.javacore.annotation;
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public class TestDemo {
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@SuppressWarnings("deprecation")
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public static void main(String[] args) {
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Person person = new Person();
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person.setName("Lisi");
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person.setAge(26);
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person.setScore(60);
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person.showInfo();
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}
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}

‎JavaBase/src/com/xinan/annotation01/Fruit.java‎

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package com.xinan.annotation01;
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public class Fruit {
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public void displayName(){
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System.out.println("水果的名字是：*****");
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}
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}
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class Orange extends Fruit {
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@Override
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public void displayName(){
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System.out.println("水果的名字是：桔子");
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}
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}
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class Apple extends Fruit {
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@Override
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public void displayName(){
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System.out.println("水果的名字是：苹果");
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}
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}

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