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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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Packages Interview Question for fresher

1. What do you mean by package and what it contains? 2. What is the difference between user defined package and predefined package? 3. What are coding conventions must fallow while declaring user defined package names? 4. Is it possible to declare motile packages in single source file? 5. What do you mean by import? 6. What is the location of predefined packages in our system? 7. How many types of imports present in java explain it? 8. How to import individual class and all classes of packages and which one is recommended? 9. What do you mean by static import? 10. What is the difference between normal and static import? 11. Is it possible to import multiple packages in single source file? 12. Is it possible to declare multiple packages in single source file? 13. I am importing two packages, both packages contains one class with same name at that situation how to create object of two package classes? 14. If we are importing root package at that situation is it possible to ...
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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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