What is a default constraint?
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Write a java program to get a string of words and print the numbers of each word count in descending order
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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explain about jre and jvm
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why we write public static void main (String args[]) in core java plz explain briefly??????????????????
Core Java 
