DumpMethods.java
package com.test.reflection;
import java.lang.reflect.Method;
public class DumpMethods {
public static void main(String args[]) throws Exception{
Class<?> classType = Class.forName(args[0]);
Method [] methods = classType.getDeclaredMethods();
for(int i=0;i<methods.length;i++){
System.out.println(methods[i].toString());
}
}
}
InvokeTester.java
package com.test.reflection;
import java.lang.reflect.Method;
public class InvokeTester {
public int add(int param1, int param2){
return param1 + param2;
}
public String echo(String msg){
return "echo: " + msg;
}
public static void main(String[] args) throws Exception{
Class<?> classType = InvokeTester.class;
Object invokeTester = classType.newInstance();
Method addMethod = classType.getMethod("add", new Class[]{int.class, int.class});
Object result = addMethod.invoke(invokeTester, new Object[]{new Integer(100), new Integer(200)});
System.out.println((Integer)result);
Method echoMethod = classType.getMethod("echo", new Class[]{String.class});
result = echoMethod.invoke(invokeTester, new Object[]{"Hello"});
System.out.println((String)result);
}
}
ReflectTest.java
package com.test.reflection;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class ReflectTest {
public Object copy(Object object) throws Exception {
Class<?> classType = object.getClass();
System.out.println("Class: " + classType.getName());
Object objectCopy = classType.getConstructor(new Class[] {}).newInstance(new Object[] {});
Field fields[] = classType.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
String fieldName = field.getName();
String firstLetter = fieldName.substring(0, 1).toUpperCase();
String getMethodName = "get" + firstLetter + fieldName.substring(1);
String setMethodName = "set" + firstLetter + fieldName.substring(1);
Method getMethod = classType.getMethod(getMethodName, new Class[] {});
Method setMethod = classType.getMethod(setMethodName, new Class[] { field.getType() });
Object value = getMethod.invoke(object, new Object[] {});
System.out.println(fieldName + ":" + value);
setMethod.invoke(objectCopy, new Object[] { value });
}
return objectCopy;
}
public static void main(String[] args) throws Exception {
Customer customer = new Customer("Tom", 21);
customer.setId(new Long(1));
Customer customerCopy = (Customer) new ReflectTest().copy(customer);
System.out.println("Copy information:" + customerCopy.getId() + " "
+ customerCopy.getName() + " " + customerCopy.getAge());
}
}
class Customer {
private Long id;
private String name;
private int age;
public Customer() {
}
public Customer(String name, int age) {
super();
this.name = name;
this.age = age;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
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;
}
}
Xavier Ding 