What is the difference between hashmap and hashtable? What is an interface?

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What is contract between hashcode and equal method?

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What is polymorphism in java? What are the kinds of polymorphism?

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What is mysql driver class name?

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What is the difference between static and non-static variables in java programming?

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What is native code?

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Is it possible to write JAVA program without including any of the packages,such as "import java.io.*"; bcoz I instantly wrote a code without "import..." statement and runned the program on command Line & it worked. the code is: class Person { String name; int age; Person(String s,int a) { name = s; age = a; } accept() { System.out.println(name+"Hi!!!!!"); System.out.println(age); } } class Demo { public static void main(Strings args[])throws IOException { String name = args[0]; int age = Integer.parseInt(args[1]); Person p = new Person(name,age); p.accept(); } }

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What is difference between iterator access and index access?

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What is method and methodology?

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Can a class have 2 constructors?

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What is the purpose of garbage collection in java, and when is it used?

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Why set do not allow duplicates in java?

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