A Class That Supports Shallow Cloning - Java Object Oriented Design

Java examples for Object Oriented Design:Clone

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Description

A Class That Supports Shallow Cloning

Demo Code

public class Main {
  public static void main(String[] args) {
    ShallowClone sc = new ShallowClone(100.00);
    ShallowClone scClone = (ShallowClone) sc.clone();

    // Print the value in original and clone
    System.out.println("Original:" + sc.getValue());
    System.out.println("Clone :" + scClone.getValue());

    // Change the value in original and it will change the value
    // for clone too because we have done shallow cloning
    sc.setValue(200.00);// w  w  w.j a va2  s  .  c o  m

    // Print the value in original and clone
    System.out.println("Original:" + sc.getValue());
    System.out.println("Clone :" + scClone.getValue());
  }
}

class MyClass implements Cloneable {
  private double value;

  public MyClass(double value) {
    this.value = value;
  }

  public void setValue(double value) {
    this.value = value;
  }

  public double getValue() {
    return this.value;
  }

  public Object clone() {
    MyClass copy = null;
    try {
      // Call the clone() method of the Object class
      copy = (MyClass) super.clone();
    } catch (CloneNotSupportedException e) {
      // If anything goes wrong during cloning, print the error details
      e.printStackTrace();
    }
    return copy;
  }
}

class ShallowClone implements Cloneable {
  private MyClass holder = new MyClass(0.0);

  public ShallowClone(double value) {
    this.holder.setValue(value);
  }

  public void setValue(double value) {
    this.holder.setValue(value);
  }

  public double getValue() {
    return this.holder.getValue();
  }

  public Object clone() {
    ShallowClone copy = null;
    try {
      copy = (ShallowClone) super.clone();
    } catch (CloneNotSupportedException e) {
      e.printStackTrace();
    }
    return copy;
  }
}

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