Software - Java

• What is the difference between an Interface and an Abstract class?
• What is the purpose of garbage collection in Java, and when is it used?  
• Describe synchronization in respect to multithreading.
• Explain different way of using thread?  
• What are pass by reference and passby value?
• What is HashMap and Map?
• Difference between HashMap and HashTable?
• Difference between Vector and ArrayList?
• Difference between Swing and Awt?
• What is the difference between a constructor and a method?
• What is an Iterators?
• State the significance of public, private, protected, default modifiers both singly and in combination and state the effect of package relationships on declared items qualified by these modifiers.
• What is an abstract class?
• What is static in java?
• What is final?