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Java Programming Questions

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21. What is JVM (Java Virtual Machine)?
  JVM stands for Java Virtual Machine. It is an abstract computer or virtual computer which runs the compiled java programs. Actually JVM is a software implementation which stands on the top of the real hardware platform and operating system. It provides abstraction between the compiled java program and the hardware and operating system.
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22. What are Native methods in Java?
  There may be times when you want to call subroutines which are written in some other language other than Java like C++, VB6 etc.
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23. Names few Design Patterns used for designing Java applications?
 
  • Singleton
  • Factory
  • Abstract Factory
  • Proxy
  • Command
  • Builder.
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24. How would you pass a java integer by reference to another function?
  Passing by reference s impossible in JAVA but Java supports the objects reference so object is only way to pass the integer by reference.
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