Program for singleton objects which returns two instances

**Sarfaraj Khan** · 02-02-2010

Hello Friend,

I have to code one java program, in which singleton objects should returns two instances. I am getting troubled while coding this java program. I have one program code for this but it's not showing desired output. If anyone posses the java code in which the singleton objects returns two instances, then please share those java code with me. I will really appreciate you help.

**Katty** · 02-02-2010

Hi friend,

You need to refer following in which a singleton object which returns two instances:

Code:

public class JsingletonDemo
 {
   private static JsingletonDemo inst= null;
protected JsingletonDemo() {
                               }
public static JsingletonDemo getInstance() {
      if(inst == null) {
         inst = new JsingletonDemo();
      }
      return instance;
   }
}
public class SingletonIns1 {
  public SingletonIns1() { 
JsingletonDemo inst = JsingletonDemo.getInstance();
JsingletonDemo anotherInst = new JsingletonDemo();
}
}

**kelfro** · 02-02-2010

Default constructor for Singleton is private, any other object in the system has to access the Singleton object through the Instance property. Separating the abstract concept from a particular implementation, as this patterns collection does, may make the Singleton implementation look surprisingly simple. See following example:

Code:

public class singltonP

{

public static void main(String argl[])

{

singltonP sh =new singltonP();

someotherclass sh1=new singltonP();

}

}

**Zecho** · 02-02-2010

Hi,

In following java example the singleton object "anotherInst" returns two instances. I suggest you to copy this program and try to run in your system and see if it's executed successfully or not:

Code:

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

**Reegan** · 02-02-2010

Hello friend,

I have following java program code, and which show how to define Singleton object which can returns two instances:

Code:

public class Sngt {
private static Sngt inst null;

private static int count 0;
protected Sngt() {

}
public static Sngt getInstance() {
if(count1 < 2) {

count1++;
inst new Sngt();
}
return instance;
}
}
public class SingletonIns {
public SingletonIns() {
Sngt inst Sngt.getInstance();
Sngt anotherInst new Sngt().getInstance();
}
}

**Sarfaraj Khan** · 02-02-2010

Hello Friend,

Thanks for all your instant help!!! All you suggestions was very help to code java program for singleton object which returns two objects. As in question I had told that my program code is not giving desired output. So I correct those code using your above mentioned code. And now this code is executed properly. I am appreciating your help.