}
}
Person.java
package com.ldw.bean;
public class Person {
private String name;
private int age;
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;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Person other = (Person) obj;
if (age != other.age)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
}
输出：
====class com.ldw.bean.Person
====class com.ldw.bean.Person
====class com.ldw.bean.Person
true
true
利用反射读取配置文件：
config.properties
com.ldw.test.Apple
refelect_test1.java
package com.ldw.test;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
public class refelect_test1 {
public static void main(String[] args){
JuiceMaker jm = new JuiceMaker();
//jm.run(new Apple());
//jm.run(new Orange());
BufferedReader br;
try {
br = new BufferedReader(new FileReader(“config.properties”));
//利用反射读取配置文件
Class clazz = Class.forName(br.readLine());
//Class类的newInstance()方法是使用该类无参的构造函数创建对象
Fruit apple = (Fruit) clazz.newInstance();
System.out.println(“clazz====” + clazz);
jm.run(apple);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
interface Fruit{
public void squeez();
}
class Apple implements Fruit{
@Override
public void squeez(){
System.out.println(“this is apple juice=====”);
}
}
class Orange implements Fruit{
@Override
public void squeez(){
System.out.println(“this is orange juice=====”);
}
}
class JuiceMaker{
public void run(Fruit fruit){
fruit.squeez();
}
}
输出
clazz====class com.ldw.test.Apple
this is apple juice=====
Class类的newInstance()方法是使用该类无参的构造函数创建对象, 如果一个类没有无参的构造函数, 就不能这样创建了,可以调用Class类的getConstructor(String.class,int.class)方法获取一个指定的构造函数然后再调用Constructor类的newInstance(“张三”,20)方法创建对象
Person.java
package com.ldw.bean;
public class Person {
private String name;
private int age;
public Person() {
super();
}
public Person(String name, int age) {
super();
this.name = name;
this.age = age;
}
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;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Person other = (Person) obj;
if (age != other.age)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
@Override
public String toString() {
return “Person [name=” + name + “, age=” + age + “]”;
}
}
refelect_test2.java
package com.ldw.test;
import java.io.BufferedReader;
import java.io.FileReader;
import java.lang.reflect.Constructor;
import com.ldw.bean.Person;
public class refelect_test2 {
public static void main(String[] args){
try {
Class clazz = Class.forName(“com.ldw.bean.Person”);
Constructor c = clazz.getConstructor(String.class, int.class);
System.out.println(“clazz====” + clazz);
Person p = (Person) c.newInstance(“zhangsan”, 22);
System.out.println§;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
输出：
clazz====class com.ldw.bean.Person
Person [name=zhangsan, age=22]
利用反射修改参数，调用方法：
Person.java
package com.ldw.bean;
public class Person {
public String name;
private int age;
public Person() {
super();
}
public Person(String name, int age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public voi
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d setAge(int age) {
this.age = age;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Person other = (Person) obj;
