HCL Interview Question for Software Engineer / Developers






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Singeton Class has only a single instance that is created (Refer Singleton Pattern- Static methods)

- madmax February 21, 2007 | Flag Reply
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Singlton Class is using Singleton design pattern, so that at a time only one instance of the class will exist. Generally we are using ObjectFactory which insure that if one instance of object exist than that object is returned otherwise new instance is created and return that.

- Shovit Kumar April 03, 2009 | Flag Reply
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any example plz reveal

- santy October 27, 2012 | Flag Reply
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The Singleton design pattern addresses all of these concerns. With the Singleton design pattern you can:

1.Ensure that only one instance of a class is created
2.Provide a global point of access to the object
3.Allow multiple instances in the future without affecting a singleton class's clients

Ex Program:

public class ClassicSingleton {
private static ClassicSingleton instance = null;
protected ClassicSingleton() {
// Exists only to defeat instantiation.
}
public static ClassicSingleton getInstance() {
if(instance == null) {
instance = new ClassicSingleton();
}
return instance;
}
}

- Mohan K @ DSM Soft,Trichy September 11, 2013 | Flag Reply


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