定義一個接口
package cn.yangtao.reflect;
public interface China {
public static final String NATIONAL="China";
public static final String AUTHOR="小明";
public void sayChina();
public String sayHello(String name,int age);
}
定義一個Person類實現以上的接口
package cn.yangtao.reflect;
public class Person implements China {
private String name;
private String age;
public Person(){}
public Person(String name, String age) {
super();
this.name = name;
this.age = age;
}
public Person(String name) {
super();
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String sayHello(String name, int age) {
// TODO Auto-generated method stub
return name+",你好！我今年"+age+"歲了";
}
public void sayChina() {
// TODO Auto-generated method stub
System.out.println("作者："+AUTHOR+",國籍"+NATIONAL);
}
}
1、取得Person類所實現的全部接口
package cn.yangtao.reflect;
public class GetInterfaceDemo {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Class<?>c1=null;
try {
c1=Class.forName("cn.yangtao.reflect.Person");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Class<?>[]inter=c1.getInterfaces();
for(Class c:inter){
System.out.println(c.getName());
}
}
}
2、取得Person類的全部構造方法
package cn.yangtao.reflect;
import java.lang.reflect.Constructor;
public class GetConstructorDemo {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Class<?>c2=null;
try {
c2=Class.forName("cn.yangtao.reflect.Person");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Constructor[] c=c2.getConstructors();
for(Constructor c1:c){
System.out.println(c1.getName());
}
}
}
3、取得單個構造方法
import java.lang.reflect.*;
public class ReflectDemo02{
public static void main(String args[])throws Exception{
Class<String> c1=String.class;
Constructor<String>con=c1.getConstructor(String.class);
String str=con.newInstance("abcd");
System.out.println(str.charAt(2));
}
}
如果不是String 類而是自己定義的類，如Person類，最好可以定義一個無參的構造方法。這樣在實例化時不用傳入參數
而對於Person類屬性的操作可以通過Person類的setter和getter方法
4、取得Person類的父類
package cn.yangtao.reflect;
public class GetSuperDemo {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Class<?>c=null;
try {
c=Class.forName("cn.yangtao.reflect.Person");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Class<?>c1=c.getSuperclass();
System.out.println(c1.getName());
}
}
5、取得Person類的屬性