Java interview questions

• What is the difference between the JDK and the JRE?
• What is the difference between checked and unchecked exceptions?
• What is the difference between final, finally and finalize?
• What is the difference between an Inner Class and a Sub-Class?
• What are the various access specifiers for Java classes?
• What is data encapsulation and why is it important?
• What is a singleton and when is it typically used in Java?
• What is the difference between the continue and break statements?
• What is the base class in Java from which all other classes are derived?
• What packages in Java? Why are they used?
• What is the difference between an Abstract Class and Interface in Java?
• Does Java pass by reference or by value?
• Is it mandatory for a try block to be followed by a catch block in Java’s exception handling?