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Wrapper Class

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Wrapper classes Java is an Object oriented programming language so represent everything in the form of the object, but java supports 8 primitive data types these all are not part of object. To represent 8 primitive data types in the form of object form we required 8 java classes these classes are called wrapper classes. All wrapper classes present in the java.lang package and these all classes are immutable classes. Wrapper classes hierarchy Wrapper classes Constructor Integer i = new Integer(10); Integer i1 = new Integer("100"); Float f1= new Float(10.5); Float f1= new Float(10.5f); Float f1= new Float("10.5"); Character ch = new Character('a'); datatypes wrapper-class constructors byte Byte byte,String short Short short,String int Integer int,String long Long ...
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Java Class declaration interview Questions

1) What is present version of java and initial version of java? 2) How many modifiers in java and how many keywords in java? 3) What is initial name of java and present name of java? 4) Can we have multiple public classes in single source file? 5) Can we create multiple objects for single class? 6) What do you mean by token and literal? 7) What do you mean by identifier? 8) Is it possible to declare multiple public classes in single source file? 9) What is the difference between editor and IDE(integrated development environment) 10) Write the examples of editor and IDE? 11) Define a class? 12) In java program starts form which method and who is calling that method? 13) What are the commands required for compilation and execution? 14) Can we compile multiple source files at a time and is it possible to execute multiple .classes at a time? 15) The compiler understandable file format and JVM understandable file format? 16) What is the difference between JRE and JDK? 17) ...
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Garbage Collector Interview Questions

1. What is the functionality of Garbage collector? 2. How many ways are there to make eligible our objects to Garbage collector? 3. How to call Garbage collector explicitly? 4. What is the purpose of gc( ) method? 5. What is the purpose of finalize() method? 6. If the exception raised in finalize block what happenederror or output? 7. What is the purpose of RunTime class? 8. How to create object of RunTime class? 9. What is singleton class? 10. What is the algorithm fallowed by GC? 11. What is the difference between final , finally , finalize()? 12. When GarbageCollector calls finalize()? 13. Finalize method present in which class? 14. Which part of the memory involved in garbage collector Heap or Stack? 15. Who creates stack memory and who destroy that memory? 16. What do you mean by demon thread? Is Garbage collector is DemonThread? 17. How many times Garbage collector does call finalize() method for object? 18. What are the different ways to call Garbage collector...
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