What are the ways to break singleton pattern ?
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Q1.
What are the ways to break singleton pattern ?
Design
Ans. If we don't have double checked locking, it can be broken easily through multi threaded access.
Through Reflection.
If multiple class loaders are loading the class.
If the class is serializable or cloneable.
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//Double Checked Locking Code
public static Singleton createInstance() {
if(singleton == null){
synchronized(Singleton.class) {
if(singleton == null) {
singleton = new Singleton();
}
}
}
return singleton;
}
//Single checked locking code
public static Singleton createInstance() {
synchronized(Singleton.class) {
if(singleton == null) {
singleton = new Singleton();
}
}
return singleton;
}
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