java反射机制

最新推荐文章于 2025-04-29 19:24:35 发布

mush_me

最新推荐文章于 2025-04-29 19:24:35 发布

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package info.frady;

public class User {
	private String name;
	private String id;
	public User(){
		System.out.print("自定义的初始化函数被调用了");
	}
	public User(String id,String name){
		this.id=id;
		this.name=name;
		System.out.print("自定义的带参数的初始化函数被调用了");
	}
	public void sayHi(){
		System.out.print("hi,guys.I am "+name);
	}
}


package info.frady;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

public class ReflectTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

	/*	try {
			User user=(User)Class.forName("info.frady.User").newInstance();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}*/

		try {
			Class cl=Class.forName("info.frady.User");

			Constructor ct=cl.getConstructor(new Class[]{String.class,String.class});
			User user=(User)ct.newInstance(new Object[]{"1","frady"});
			user.sayHi();

		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		catch (SecurityException e) {
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		}

	}

}