[Yuri crack man] brings you easy understanding - deep copy and shallow copy

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Preface  

                            

         Red Alert 2 Yuri is in revenge , There is a very powerful combat arm —— yuri , Enemy arms can be psychologically controlled through mind control , For our camp , Because a Yuri can only control three combat units at most , Therefore, a cloning design has been developed , You can clone multiple Yuri , Realize the control of multiple enemy combat units .

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Shallow copy

What does this have to do with shallow copies ？

        When technology is not advanced （ hypothesis ）, Yuri and Yuri split people have such a characteristic , There will be empathy between them , Just imagine , If there are hundreds of thousands of Yuri crack people , Once a Yuri split man dies , It means the collapse of the entire military region （ Yuri has only one , There can be an infinite number of people ）, Bring huge losses , This is similar to Shallow copy , modify , Properties of any copied object （ Or the subject ）, Will affect other objects ;

The code is as follows ：

// state 
class Action{
    public String action = " normal ";
}
// yuri 
class Yuri implements Cloneable{// Mark the cloned Yuri real body 
    public String name = " yuri ";
    public Action action = new Action();

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
    @Override
    public String toString() {
        return "Yuri{" +
                "name='" + name + '\'' +
                ", action='" + action.action + '\'' +
                '}';
    }
}
public class Test {
    public static void main(String[] args) throws CloneNotSupportedException {
        Yuri yuri = new Yuri();
        Yuri yuriclone1 =(Yuri) yuri.clone();// Throw an exception , Because it is Object class , Downward transformation requires mandatory type conversion 
        Yuri yuriclone2 =(Yuri) yuri.clone();
        System.out.println(yuri);
        System.out.println(yuriclone1);
        System.out.println("-------------- Split line --------------");
        yuri.action.action = " injured ";// One injured , Others were injured 
        System.out.println(yuri);
        System.out.println(yuriclone1);
        System.out.println(yuriclone2);
    }
}

Running results ：

analysis ：

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Deep copy  

What does this have to do with deep copy ？

        With advanced technology （ hypothesis ）, In cloning, Yuri will not be associated with other fissured people , empathy , Even if a cracked man dies in situ , Nor will it affect other disintegrators and Yuri's real body to fight , This is similar to deep copy , modify , Properties of any copied object （ Or the subject ）, Will not affect other objects ;

The code is as follows ：

// state 
class Action implements Cloneable{
    public String action = " normal ";

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}
// yuri 
class Yuri implements Cloneable{// Mark the cloned Yuri real body 
    public String name = " yuri ";
    public Action action = new Action();

    @Override
    protected Object clone() throws CloneNotSupportedException {
        Yuri tmpclone = (Yuri) super.clone();// The cloning of Yuri 
        tmpclone.action = (Action) this.action.clone();// Cloning of States 
        return tmpclone;
    }
    @Override
    public String toString() {
        return "Yuri{" +
                "name='" + name + '\'' +
                ", action='" + action.action + '\'' +
                '}';
    }
}
public class Test {
    public static void main(String[] args) throws CloneNotSupportedException {
        Yuri yuri = new Yuri();
        Yuri yuriclone1 =(Yuri) yuri.clone();// Throw an exception , Because it is Object class , Downward transformation requires mandatory type conversion 
        Yuri yuriclone2 =(Yuri) yuri.clone();
        System.out.println(yuri);
        System.out.println(yuriclone1);
        System.out.println(yuriclone2);
        System.out.println("-------------- Split line --------------");
        yuri.action.action = " injured ";// One injured , Others were injured 
        System.out.println(yuri);
        System.out.println(yuriclone1);
        System.out.println(yuriclone2);
    }
}

Running results ：

analysis ：