Why is String immutable?
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What is binary tree in java?
Explain purpose of sleep() method in java?
What is java volatile?
Difference between error and exception
Can java hashmap have duplicate keys?
What is the need to implement Serializable interface (with no methods) for objects which are to be serialized ? We can write our own functionality which writes objects to streams then why we need to implement and tell JVM that which objects can be serialized.
How to create packages in java?
whats the diff between jsp and servlets?
i need to know the site which compiles and run the java program completely in online... thank you for your reply in advance
What's the purpose of static methods and static variables?
What are the names of Component subclasses that support painting?
What is port number in java?