What is singleton class in java and how can we make a class singleton?
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difference between arraylist and linkedlist otherthan performance
What does index mean in java?
What's the difference between comparison done by equals method and == operator?
Can constructor be synchronized?
Write a java program to find the route that connects between Red and Green Cells. General Rules for traversal 1. You can traverse from one cell to another vertically, horizontally or diagonally. 2. You cannot traverse through Black cells. 3. There should be only one Red and Green cell and at least one of each should be present. Otherwise the array is invalid. 4. You cannot revisit a cell that you have already traversed. 5. The maze need not be in the same as given in the above example
What are heap memory and stack memory and what are memory tables.
What language is pass by reference?
What is the difference between int and integer in java?
What is function and its uses?
What are desktop procedures?
What is visibility mode?
What is binary tree in java?
Core Java 
