第十一条：简单理解clone

谁践踏了优雅 2022-07-16 12:19 109阅读 0赞

package cn.stu;
    
    public class Student implements Cloneable{
    
    	 public String  name; 
    	 public String  school;
    	 
    	 
    	 
    	 @Override
    	protected Object clone() throws CloneNotSupportedException {
    	 
    		Student stu = null;
    		
    		stu = (Student)super.clone();
    		 
    		return stu;
    	}
    
    }

package cn.stu;
    
    public class Person implements Cloneable{
    
    	public String userName;
    	public String type;
    	public Student stu;
    
    	public String getUserName() {
    		return userName;
    	}
    
    	public void setUserName(String userName) {
    		this.userName = userName;
    	}
    
    	public String getType() {
    		return type;
    	}
    
    	public void setType(String type) {
    		this.type = type;
    	}
    	
    	
    	@Override
    	protected Object clone() throws CloneNotSupportedException {
    		
    		Person  person = null;
    		
    		person = (Person)super.clone();
    		
    		// 深
    		person.stu = (Student)stu.clone();
    		
    		return person;
    	}
    	
    	
    
    }

package cn.stu;
    
    /**
     * 
            拷贝都分浅拷贝和深拷贝， 浅拷贝就是类中的属性对象的时候， 浅拷贝不会生成一个新的对象，反之深拷贝就是所有的都是新的。 
       必须实现Cloneable这个接口。 
          
    *
     */
    public class Main {
    	
    	public static void main(String[] args) throws CloneNotSupportedException {
    		 
    		
    		Person  personA = new Person();
    		personA.userName = "小强";
    		personA.type = "白种人";
    		
    		Student stu = new Student();
    		stu.name = "小明";
    		stu.school = "3年2班";
    		
    		personA.stu = stu;
    		
    		Person personB = (Person)personA.clone();
    		
    		System.out.println(personA+"---->"+personB);
    		System.out.println(personA.stu+"---->"+personB.stu);
    		
    		
    		
    		
    		
    	}
    
    }

运行的结果：

cn.stu.Person@205eb650---->cn.stu.Person@2a134eca

cn.stu.Student@5999c55a---->cn.stu.Student@7e6bc5aa