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cloneable in Java

By: Saravanan in Java Tutorials on 2010年01月01日 [フレーム]

In this tutorial we are going to see use of cloneable interface and how to use it. The cloneable interface defines no members. It is used to indicate that a class allows a bitwise copy of an object to be made. If you try to call clone() on a class that does not implement Cloneable, a CloneNotSupportedException is thrown. When a clone is made the constructor for the object being cloned is not called. A clone is a copy of the original.

class Customer implements Cloneable 
{
 String name;
 int income;
 public Customer(String name, int income) 
 {
 this.name = name;
 this.income = income;
 }
 public Customer() 
 {
 }
 public String getName() 
 {
 return name;
 }
 public void setName(String name) 
 {
 this.name = name;
 }
 public void setIncome(int income) 
 {
 this.income = income;
 }
 public int getIncome() 
 {
 return this.income;
 }
 public Object clone() throws CloneNotSupportedException 
 {
 try 
 {
 return super.clone();
 } 
 catch (CloneNotSupportedException cnse) 
 {
 System.out.println("CloneNotSupportedException thrown " + cnse);
 throw new CloneNotSupportedException();
 }
 }
}
public class MainClass 
 {
 public static void main(String[] args) 
 {
 try 
 {
 Customer c= new Customer("Angel", 9000);
 System.out.println(c);
 System.out.println("The Customer name is " + c.getName());
 System.out.println("The Customer pay is " + c.getIncome());
 Customer cClone = (Customer) c.clone();
 System.out.println(cClone);
 System.out.println("The clone's name is " + cClone.getName());
 System.out.println("The clones's pay is " + cClone.getIncome());
 } 
 catch (CloneNotSupportedException cnse) 
 {
 System.out.println("Clone not supported");
 }
 }
}

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