What is singleton class in java and how can we make a class singleton?

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What is singleton class in java and how can we make a class singleton?..

Answer / Sarover Singh

{"singleton_class": "A singleton class in Java is a class that guarantees only one instance of the class during its lifetime. It prevents multiple instances of the class from being created.n"singleton_design_pattern": "To make a class singleton, we can use the following methods: 1) Eager Initialization - Initialize the instance at the time of class loading using static block.n2) Lazy Initialization - Create the instance when it is first called using double-checked locking or Bill Pugh's Singleton method.",n"eager_initialization": "public class EagerSingleton {"static "final" private EagerSingleton instance = new EagerSingleton();
private EagerSingleton() {}
public static EagerSingleton getInstance() {
return instance;
}"}",n"lazy_initialization": "public class LazySingleton {"static "volatile " private LazySingleton instance = null;
private LazySingleton() {}
public static synchronized LazySingleton getInstance() {nif (instance == null) {nsynchronized (LazySingleton.class) {nif (instance == null) {ninstance = new LazySingleton();n}n}n}nreturn instance;
}"}

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