Java类和成员上的一些方法实例代码

static class Parent{
}
static class Son extends Parent{
}
public static void main(String[] args) {
	Parent parent=new Parent();
	Son son=new Son();
	Assert.assertTrue(son instanceof Son);
	Assert.assertTrue(son instanceof Parent);
	Assert.assertFalse(parent instanceof Son);
	Assert.assertTrue(Son.class.isInstance(son));
	Assert.assertFalse(Son.class.isInstance(parent));
	Assert.assertTrue(Parent.class.isInstance(son));
	Assert.assertTrue(Son.class.isAssignableFrom(Son.class));
	Assert.assertFalse(Son.class.isAssignableFrom(Parent.class));
	Assert.assertTrue(Parent.class.isAssignableFrom(Son.class));
}

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
public class Account implements Serializable{
	private static final long serialVersionUID = 2103161633120805900L;
	private String name;
	private transient String password;
	public Account(String n,String p){
		this.name=n;
		this.password=p;
	}
	@Override
	  public String toString(){
		return "["+this.name+"]t["+this.password+"]";
	}
	//序列化
	public static byte[] serialize(Object object) {
		ObjectOutputStream oos = null;
		ByteArrayOutputStream baos = null;
		try {
			baos = new ByteArrayOutputStream();
			oos = new ObjectOutputStream(baos);
			oos.writeObject(object);
			oos.close();
			byte[] bytes = baos.toByteArray();
			return bytes;
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	// 反序列化
	public static Object deserialize(byte[] bytes) {
		ByteArrayInputStream bais = null;
		try {
			bais = new ByteArrayInputStream(bytes);
			ObjectInputStream ois = new ObjectInputStream(bais);
			Object rect=ois.readObject();
			ois.close();
			return rect;
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	public static void main(String[] args) throws IOException {
		Account inst=new Account("orisun","123456");
		System.out.println("序列化前"+inst);
		byte[] datas=serialize(inst);
		Account inst2=(Account)deserialize(datas);
		System.out.println("序列化后"+inst2);
	}
}