Java Clone - Advanced topic
In this video, we cover the problems associated with Cloning. The sample code is given for you to understand the topic and problems associated with cloning.
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public class SheepClone {
public static void main(String [] agrs) {
Sheep firstSheep = new Sheep("Rambo", 4);
Sheep secondSheep = firstSheep.clone();
Sheep thirdSheep = (Sheep) firstSheep.clone();
secondSheep.name = firstSheep.name;
thirdSheep.name = firstSheep.name;
System.out.println("First Sheep Name " + firstSheep.name + " and age " + firstSheep.age[0]);
System.out.println("Second Sheep Name " + secondSheep.name + " and age " + secondSheep.age[0]);
System.out.println("Third Sheep Name " + thirdSheep.name + " and age " + thirdSheep.age[0]);
firstSheep = null;
// Though the first sheep is now point to nowhere,
// the second sheep and third sheep are accessible
System.out.println("Second Sheep Name " + secondSheep.name + "and age " + secondSheep.age[0]);
System.out.println("Third Sheep Name " + thirdSheep.name + "and age " + thirdSheep.age[0]);
// You should seen the values printed by above two statements
// Try to access the first sheep ...what do you get
System.out.println("First Sheep Name " + firstSheep.name + "and age " + firstSheep.age[0]);
}
}
class Sheep implements Cloneable
{
public String name;
public int[] age ;
Sheep ( String itsName, int itsAge)
{
name = itsName;
age = new int[1] ;
age[0] = itsAge;
}
public Object clone() {
try {
return super.clone();
}
catch (CloneNotSupportedException e)
{
return this;
}
}
}