Define packages in java?

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When should we create our own custom exception classes?

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Why there are some null interface in JAVA? What does it mean? Give some null interface in JAVA?

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How to sort a vector elements that contains the user define class object? (Note: If Suppose consider, A Student class contain two data members. They are String studentName and int rollNo. I am creating Four objects for this class, each object contains students details like name and roll no. Now i am storing that objects in vector and if i retiving the elements from the vector means then it should be display in sorting order)

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can u handle an error if u write Thowable in the catch class lise try { some errorneous code }catch(Throwable e){ ...}

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Does the order of public and static declaration matter in main method?

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What is mnemonic in assembly language?

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What do you mean by local class?

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When does an object becomes eligible for garbage collection in java?

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What is the r character?

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What is the difference between conversation & casting?

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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

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