How to change the values ​of a model class?

Question

I have a model class as follows:

package MyPackage.Models;

public class MyModel {
    private int id;

    public MyModel() {
    }

    public MyModel(int id) {
        this.id = id;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
}

From this class, I create two objects as follows and value them. I want that when I change the value of b, the value of a does not change. When I change the value of b, the value of a also changes.

MyModel a = new MyModel();
MyModel b = new MyModel();
a.setId(1);
Log.i("nadertag", "a=" + a.getId());
b = a;
Log.i("nadertag", "b=" + b.getId());
b.setId(2);
Log.i("nadertag", "a=" + a.getId() + "," + "b=" + b.getId());

It should be noted that this is a simple model class and the main program has many fields that I cannot place them one by one in the b variable.

Please show me the sample solution.

Answer 1

Just follow as below:

public class MyModel implements Cloneable{
    private int id;

    public MyModel() {
    }

    public MyModel(int id) {
        this.id = id;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}

and wherever you want to get another object, simple perform cloning. e.g:

MyModel a = new MyModel();
MyModel b = (MyModel) a.clone();