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language fundamentals Identifiers:- A name in java program is called identifier it may be class name, method name, variable name and label name. Example:- Class Test { public static void main(String args[]) { int x=10; } } Test:- class name. Main:- method name. String:- predefined class name. args:- variable name. […]
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java collections Container object:- It is an object that store group of other objects. This is called as container object. Container Class:- It is a class or collection class whose object can store group of other object. All the container classes are defined in java.util.* package. Group of container collection classes called “Collection Framework”. Collection
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polymorphism Poly means =two Morph=forms If something exists in different forms called polymorphism.In java if same method can perform different task called polymorphism.In java polymorphism is considered into two versions. Compile time polymorphism (Static binding (or) method overloading). Run time polymorphism (Dynamic binding (or) method overriding). Compile time binding (Static binding (or) method overloading):- Means
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data types “Data types are used for representing the data in main memory of the computer”. PRIMITIVE DATA TYPES 1. Integer Data Types:- These are used to represent integer data. This category of data type contains four data types. Data Types Table S No Data Type Size(type) Range 1 Byte 1 +127 to -128 2 Short
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Java keywordes Java has a set of keywords that are reserved words that cannot be used as variables, methods, classes, or any other identifiers: Java Keywords Java Keywords Sno Keyword Description 1 abstract Used to declare abstract classes and methods. 2 assert Used to assert the truth of a boolean expression. 3 boolean Data type
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Variables “A variable is an identifier whose value will be changed during executing of the program”. Rules for writing variables: 1. First letter must be an alphabet. 2. The length of the variable should not exceed more than 32 characters. 3. No special symbols are allowed except underscore. 4. No keywords should use as variable
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