What is preflight request?
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Explain methods specific to list interface?
What are the main concepts of oops in java?
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
Difference between abstract and concrete class ?
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How do you define a variable?
What is the multilevel inheritance. and also give the Example of it ?
Explain about OOPS concepts and fundamentals.
What is static import in java?
Which list does not allow duplicates in java?
How is tree Mirroring implemented?
Explain the difference between runnable and callable interface in java?
Core Java 
