JAVA INTERVIEW QUESTIONS: - 20 BASICS INTERVIEW QUESTIONS ON JAVA? Part: -2.

• What is a native method?
• Does Java provide any construct to find out the size of an object?
• Is Empty .java file a valid source file?
• Can a .java file contain more than one java classes?
• What is the difference between an argument and a parameter?
• What is UNICODE?
• What are Transient and Volatile Modifiers?
• What are the different scopes for Java variables?
• What are wrapper classes?
• What is a the difference between System.err and System.out?
• What are the contracts defined by .equals()?
• If two objects are considered equal by .equals() , can it be said they has same hashCode()?
• If two objects have same hashCode() is it necessary they will be equal by using .equals() method?
• What contracts hashCode () defines?
• What is the difference between == and equals?
• What is the difference between List and List (not parameterized list and list parameterized by String) in Java?
• What are generics in jdk1.5?
• Are generics covariant?
• What are Lower-bounded wildcards in generics?
• What is Upper bounded wildcards in generics?

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