Java Simple Notes
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This document introduces Java and its key features. It states that Java is an interpreted and compiled language that is object-oriented and simple. It was developed by Sun Microsystems and first introduced in 1992. The document then discusses Java's data types, control structures like if/else and loops, object-oriented features like encapsulation and inheritance, and concepts like polymorphism and abstraction. It also covers classes, objects, constructors, and method overloading in Java.
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Java Simple Notes
- 3. Java is a interperter and compilerJava is a interperter and compiler languagelanguage Java is oop’s based languageJava is oop’s based language Java is a simple languageJava is a simple language Java is developed by sun micro systemJava is developed by sun micro system First model of java is introduce in 1992First model of java is introduce in 1992 with name oak and working model inwith name oak and working model in 19951995
- 4. DATA TYPE PERMITIVE NON PERMITIVE NUMERIC NON-NUMERIC CLASS ARRAY INTERFACEINTEGER FLOATING POINT BOOLEAN CHARACTER INT FLOAT DOUBLE SHORT BYTE LONG DATA TYPE
- 5. Feature of oop’s Encapsulation Inheritance Polymorphism Abstraction Modularity Type casting Persistence Concurrency Message passing
- 6. Encapsulation It is the ability to store the data in hidden foam. Encapsulation increase the security because the data member and member method function are stored in class. Where class work as container and we need an object to access the member of the class.
- 7. polymorphism It is the ability to take more than one foam. The word polymorphism is the combination of greek words poly + mor. where ploy means multiple and mor means foams.
- 8. CONTROL STRUCTURE If-else Nested if-else Ladder if-else Switch case Looping:- 1. While 2. Do while 3. For
- 9. Class:- it is a user defined data type.class work as container for it’s member. Class can contain:- 1.Data member 2.Member method Syntax:- Class<class name> { Data member Member method }
- 10. Object:- it is a instance of any class and compulsory to access the member of class. Syantax:- Class <class name> <obj.name>=new <classnmae>();
- 11. ConstructorConstructor It is a member method of any class.It is a member method of any class. The name of constructor always similar toThe name of constructor always similar to class name.class name. It’s cannot return a value.It’s cannot return a value. It’s call automatically when we create anIt’s call automatically when we create an object for it’s class.object for it’s class. Parameterizes constructor is possible.Parameterizes constructor is possible. It’s can’t overload.It’s can’t overload.
- 12. METHOD OVERLOADINGMETHOD OVERLOADING It’s define multiple method with sameIt’s define multiple method with same name.name. Three rule use:-Three rule use:- 1.1. no. of argumentsno. of arguments 2.2. Type of argumentsType of arguments 3.3. Sequence of argumentsSequence of arguments
- 13. INHERITANCEINHERITANCE ► It’s increase the reusability of program.It’s increase the reusability of program. ► It extends the program of ‘extends’ keyword.It extends the program of ‘extends’ keyword. ► Which class provide the service is called ‘Which class provide the service is called ‘supersuper classclass’.’. ► Which class receive the service is called ‘Which class receive the service is called ‘subsub classclass’.’. ► Type of inheritanceType of inheritance 1.1. Simple or singleSimple or single 2.2. MultilevelMultilevel 3.3. HierarchicalHierarchical