Io-浅拷贝和深拷贝

桃扇骨 2022-08-14 02:49 5阅读 0赞

package com.io;
    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 CopyObject {
    
    	public static void main(String[] args) throws IOException,ClassNotFoundException,CloneNotSupportedException{
    	
    		Student stu=new Student(1,"admin","admin");
    		//light copy
    		Student lightCopy=(Student) stu.clone();
    		
    		//deep copy
    		/*将对象写入到内存流中*/
    		ByteArrayOutputStream bos=new ByteArrayOutputStream();
    		ObjectOutputStream oos=new ObjectOutputStream(bos);
    		oos.writeObject(stu);
    		/*从内存中将对象通过流的方式读出来*/
    		ByteArrayInputStream bis=new ByteArrayInputStream(bos.toByteArray());
    		ObjectInputStream ois=new ObjectInputStream(bis);
    		Object deepCopy=ois.readObject();
    		
    		System.out.println("deepCopy:"+deepCopy);
    		System.out.println("lightCopy"+lightCopy);
    	}
    }
    class Student implements Serializable,Cloneable
    {
    	private static final long serialVersionUID = 1L;
    
    	private Integer id;
    	private String userName;
    	private String password;
    	   
    	   public Student(Integer id, String userName, String password) {
    			super();
    			this.id = id;
    			this.userName = userName;
    			this.password = password;
    		}
    		public Integer getId() {
    			return id;
    		}
    		public void setId(Integer id) {
    			this.id = id;
    		}
    		public String getUserName() {
    			return userName;
    		}
    		public void setUserName(String userName) {
    			this.userName = userName;
    		}
    		public String getPassword() {
    			return password;
    		}
    		public void setPassword(String password) {
    			this.password = password;
    		}
    		
    	public Object clone() throws CloneNotSupportedException
    	{
    		return super.clone();
    	}
          @Override
        public String toString() {
        	// TODO Auto-generated method stub
        	return "Student[id:"+id+", userName:"+userName+", password:"+password+"]";
        }
       
    }