1) write a program that singleton objects returns two instances?

V.Nalini

Sep 21st, 2005

public class snglton
{
public static void main(String args[])
{
snglton s=new snglton();
someotherclass s1=new snglton();
}
}

vinod

Sep 27th, 2005

write a singleton class and call object.clone() method on the object.

kuriakose

Sep 30th, 2005

public class CSingleton {
   private static CSingleton inst= null;
protected CSingleton() {
                               }
public static CSingleton getInstance() {
      if(inst == null) {
         inst = new CSingleton();
      }
      return instance;
   }
}
public class SingletonIns {
public SingletonIns() {
CSingleton inst = CSingleton.getInstance();
CSingleton anotherInst = new CSingleton();
}
}

swarna

Oct 14th, 2005

we can't create more than one instance for singleton object.

Jagdeep Grewal

Nov 7th, 2005

public class CSingleton {
   private static CSingleton inst= null;
private static int count=0;
protected CSingleton() {
                        }
public static CSingleton getInstance() {
      if(count < 2) {
         count++;
         inst = new CSingleton();
      }
      return instance;
   }
}
public class SingletonIns {
public SingletonIns() {
CSingleton inst = CSingleton.getInstance();
CSingleton anotherInst = new CSingleton().getInstance();
}
}

ksureshbabu
Profile Answers by ksureshbabu

Mar 5th, 2010

class Singletones implements Serializable{
   /**
   *
   */
   private static final long serialVersionUID = 6240073482570369797L;
   private static Singletones instance;
   private String name;
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   private Singletones(){

   }
   public static Singletones getInstance(){
       if(instance == null){
           instance = new Singletones();
       }
       return instance;
   }
}

public class Store {
   public static void main(String... arg) throws IOException, ClassNotFoundException, FileNotFoundException{
       Singletones obj1 = Singletones.getInstance();
       obj1.setName("name1");
       FileOutputStream file = new FileOutputStream("c:\singleton.ser");
       ObjectOutputStream oos = new ObjectOutputStream(file);
       oos.writeObject(obj1);
       FileInputStream file1 = new FileInputStream("c:\singleton.ser");
       ObjectInputStream ois = new ObjectInputStream(file1);
       Singletones obj2 = (Singletones) ois.readObject();
       obj2.setName("name2");
       System.out.println(obj1.getName());
       System.out.println(obj2.getName());
   }
}

Output:-
name1
name2