Javaオブジェクトコピーのディープコピーとシャローコピー

public class Main{
	public static void main(String[] args){
	}
}
class Employee implements Cloneable{
	private int id;
	private Date date;
	public Employee(){}
	public Employee(int id){
		this.id=id;
		this.date=new Date();
	}
	@Override
	public Employee clone() throws CloneNotSupportedException{
		Object t=super.clone();//此时的object中的拷贝只是浅拷贝
		Employee clone=(Employee)t;
		clone.date=this.data.clone();//date类实现了深拷贝，直接调用即可
		return clone;
	}
}
class Mannager extends Employee{
	private String name;
	public Mannager(){
		super();
	}
	public Mannager(String name,int id){
		super(id);
		this.name=name;
	}
	@Override
	public Mannager clone(){
		Employee t=super.clone();//先把id date属性复制
		Mannager clone=(Mannager)t;
		clone.name=t.name;//String 对象直接赋值引用
		return clone;
	}
}