JAVA 反射

package reflect;

public class Person {
	private String name;
	private int age;
	
	public Person() {
		
	}
	
	public Person(String name) {
		this.name = name;
	}
	
	public Person(int age) {
		this.age = age;
	}
	
	public Person(String name, int age) {
		this.name = name;
		this.age = age;
	}
	
	public void setName(String name) {
		this.name = name;
	}
	
	public void setAge(int age) {
		this.age = age;
	}
	
	public String getName() {
		return name;
	}
	
	public int getAge() {
 		return age;
	}
	
	@Override
	public String toString() {
		return "[name = " + name + ", age = " + age + "]";
	}
	
}

package reflect;

import java.lang.reflect.*;
public class ReflectTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Class<?> cl = null;
		try {
			cl = Class.forName("reflect.Person");
			String modifiers = Modifier.toString(cl.getModifiers());
			if (modifiers.length() > 0)
				System.out.print(modifiers + " ");
			System.out.println(cl.getName() + "{");
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		printFields(cl);
		System.out.println();
		printConstructors(cl);
		System.out.println();
		printMethods(cl);
		System.out.println("}");
	}

	public static void printConstructors(Class<?> cl){
		Constructor<?>[] c = cl.getConstructors();
		for (int i = 0; i < c.length; i++) {
			String modifiers = Modifier.toString(c[i].getModifiers());
			if (modifiers.length() > 0)
				System.out.print(modifiers + " ");
			String name = c[i].getName();
			System.out.print(name + "(");
			Class<?>[] paramTypes = c[i].getParameterTypes();
			for (int j = 0; j < paramTypes.length-1; j++) 
				System.out.print(paramTypes[j].getName() + ",");
			if (paramTypes.length > 0)
				System.out.print(paramTypes[paramTypes.length-1]);
			System.out.println(");");
		}
	}
	
	public static void printFields(Class<?> cl) {
		Field[] fields = cl.getDeclaredFields();
		for (Field f : fields) {
			String modifiers = Modifier.toString(f.getModifiers());
			if (modifiers.length() > 0)
				System.out.print(modifiers + " ");
			String name = f.getName();
			System.out.println(name + ";");
		}
	}
	
	public static void printMethods(Class<?> cl) {
		Method[] methods = cl.getDeclaredMethods();
		for (Method m : methods) {
			String modifiers = Modifier.toString(m.getModifiers());
			if (modifiers.length() > 0)
				System.out.print(modifiers + " "); 
			Class<?> retType = m.getReturnType();
			String name = m.getName();
			System.out.print(retType.getName() + " " + name + "(");
			Class<?>[] paramTypes = m.getParameterTypes(); 
			for (int i = 0; i < paramTypes.length; i++) {
				if (i > 0)
					System.out.print(", ");
				System.out.print(paramTypes[i]);
			}
			System.out.println(");");
		}
	}
}

public reflect.Person{
private name;
private age;

public reflect.Person(class java.lang.String);
public reflect.Person(int);
public reflect.Person(java.lang.String,int);
public reflect.Person();

public java.lang.String toString();
public java.lang.String getName();
public void setName(class java.lang.String);
public void setAge(int);
public int getAge();
}