What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?
What does three dots mean in java?
What is the use of jtable?
How do you reverse a list?
How can we find the actual size of an object on the heap?
What does system.gc() and runtime.gc() methods do?
What is difference between this and super keyword?
What is sortedset in java?
What is the difference between iterator and list iterator?
What is singleton pattern?
Differentiate jar and war files?
How do you check if a string contains only numeric digits?
What is difference between length and length() method in java ?
What is the purpose of default constructor?
What is difference between jdk,jre and jvm?