java-basics/core-java/methods/ShallowCopy.java at master · CodeForHunger/java-basics · GitHub

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package methods;

/**

* Whenever we use default implementation of clone method we get shallow copy of

* object means it creates new instance and copies all the field of object to that

* new instance and returns it as object type, we need to explicitly cast it back

* to our original object. This is shallow copy of the object.

import java.util.ArrayList;

class ShallowCopy1 {

int x, y;

}

class ShallowCopy2 implements Cloneable {

int a, b;

ShallowCopy1 c = new ShallowCopy1();

public Object clone() throws CloneNotSupportedException {

return super.clone();

}

public class ShallowCopy {

public static void main(String[] args) throws CloneNotSupportedException {

ShallowCopy2 t1 = new ShallowCopy2();

t1.a = 10;

t1.b = 20;

t1.c.x = 30;

t1.c.y = 40;

ShallowCopy2 t2 = (ShallowCopy2)t1.clone();

t2.a = 100;

t2.c.x = 300;

System.out.println(t1.a + " " + t1.b + " " + t1.c.x + " " + t1.c.y);

System.out.println(t2.a + " " + t2.b + " " + t2.c.x + " " +t2.c.y);

}

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