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Complete PPT about the Java lokesh kept it
- 1. PROGRAMMING WITH CORE JAVA BOLLINENI SIREESHA 20781A0423 III BTECH ECE-A
- 2. INTRODUCTION • Java is a high-level ,class -based,object oriented programming ,simple programming language • Java was originally developed by james gosling at sun microsystems It released in may 1995 as a core component of sun microsystems’java platform • The original and reference implemention java compilers,virtual machines,and class libraries were originally released by sun under proprietary licenses
- 3. INTRODUCTION • The syntax of java similar to C and C++ • Java makes writing,compiling and debugging programming easy • Java applications are compiled to byte code that can run on any virtual machine.
- 4. JAVA TERMINOLOGY • Before learning java,one must be be familiar with these common terms of java • Java Virtual Machine(JVM):This is generally referred to as JVM. There are three execution phases of a program . They are written,compile,and run the program • Java Development kit(JDK): It is completed java development kit that includes everthing including compiler
- 5. JAVA TERMINOLOGY • Java Runtime Environment(JRE): JDK includes JRE .JRE installation on our computers allows the java however ,we cannot compile it. JRE includes a browser,JVM.
- 6. VARIABLES AND DATATYPES variables • String: Stores text, such as “hello” • Int:Stores integers(whole numbers), without decimals,such 123 or-123. • Float :Stores floating points with decimal,such as 19.99 or-19.99. • char:Stores single characters,such as ‘a’ or’B’.. • Boolean:Stores values with two states:true and false.
- 7. Datatypes • Data types are different sizes and values that can be stored in the variable that is made as per convenience and circumstances to cover • There are two types: • Primitive Data Type: such as boolean, char, int, short, byte, long, float, and double • Non-Primitive Data Type or Object Data type: such as String, Array, etc. • •
- 8. OPERATORS • Operators are used to perform operations on varaibles and values • Operator in Java is a symbol that is used to perform operations. For example: +, -, *, / etc. • There are many types of operators in Java which are given below: • Arithmetic Operator:*, /, %,+, - • Relational Operator:<, >, <=, >=, ==, != • Bitwise Operator: &,bitwise exclusive OR^,bitwise inclusive OR • Logical Operator: logical AND&&,logical ORII • Assignment Operator:=‘ +=, -=, *= ,/= ,%=, &=, ^= ,|=, <<=, >>=, >>>=
- 9. STRINGS • Strings, which are widely used in Java programming, are a sequence of characters. In the Java programming language, strings are objects. • String length:The string length method returns the number of characters written in the String. This method returns the length of any string which is equal to the number of 16-bit Unicode characters in the string •
- 10. Advantages • store multiple data of similar types with the same name. It allows random access to elements • In an array, accessing an element is very easy by using the index number.
- 11. comments • Comments in Java are the statements are not executed by the compiler and interpreter • Two types of comments: • Single-line comments:// single-line comment • Multi-line comments: • /*multi -line comment*/
- 12. ARRAYS • What is an array in Java? • An array is a container object that holds a fixed number of values of a single type. • An array is a collection of similar types of data • There are two types of array: • Two-dimensional array. • Multi-dimensional array.
- 13. Class and Object • Class:A class is a blueprint for declaring and creating objects. • Ex:If animal is the class then dog is the object, if human is the class then man is the object. • Objects:An object is a class instances that allows programmers to use variables and methods from inside the class • Ex: mountain cycles, touring cycles
- 14. constructions • Java allows the object to initialize itself when it is created. This automatic initialization is known as Constructors. • The constructor is a block of code that initializes the newly created object. constructor initializes an object immediately upon creation. Once defined, the constructor is called automatically Constructors have no return type, not even void.
- 15. polymorphism • Polymorphism is a Greek word where poly means many or several and morph means faces/ behaviors or functionalities. So, in simple words, we can say that polymorphism is the ability of an entity to take several forms. • Advantages of Polymorphism in Java: • More flexible and reusable code. • The single variable name can be used to store variables of multiple data types. • Faster and efficient code at Runtime. • Code that is protected from extension by other classes. • More dynamic code at runtime. •
- 16. KEY WORDS • A keyword is a term used in digital marketing to describe a word or a group of words an Internet user uses to perform a search in a search engine or search bar • Keywords: • Super Keyword in Java. • final Keyword in Java. • abstract keyword in java. • static Keyword in Java. • 'this' reference in Java. • enum in Java.
- 17. STATIC KEYWORD • The static keyword is a non-access modifier used for methods and attributes. Static methods/attributes can be accessed without creating an object of a class • Uses: • The static keyword in Java is mainly used for memory management. The static keyword in Java is used to share the same variable or method of a given class. The users can apply static keywords with variables, methods, blocks, and nested classes. The static keyword belongs to the class than an instance of the class.02-Dec-2021
- 18. THIS KEYWORDS this keyword refers to the current object in a method or constructor. The most common use of the this keyword is to eliminate the confusion between class attributes and parameters with the same name •
- 19. ABSTRACT KEYWORD The abstract keyword is a non-access modifier, used for classes and methods. Class: An abstract class is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class).
- 20. SUPER KEYWORD • The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor. The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.
- 21. FINAL KEYWORD • The final keyword is a non-access modifier used for classes, attributes and methods, which makes them non-changeable (impossible to inherit or override). The final keyword is useful when you want a variable to always store the same value, like PI (3.14159...).
- 22. FEATURES • Some of the important Java 8 features are; • forEach() method in Iterable interface. • default and static methods in Interfaces. • Functional Interfaces and Lambda Expressions. • Java Stream API for Bulk Data Operations on Collections. • Java Time API. • Collection API improvements. • Concurrency API improvements. • Java IO improvements. • •
- 23. APPLICATIONS • Spotify (Music Streaming App) ... • Twitter (Social Media App) ... • Opera Mini (Web Browser) ... • CashApp (Mobile Payment Service) ... • ThinkFree Office (Desktop-based App) ... • Signal ( Messaging Services) ...
- 24. CONCLUSION • In a intershala, This intership Has been an excellent and rewarding Experience I Can Conclude That There Have Been A Lot I’ve Learnt From My work . At intershala Needless To say • The Techincal aspects of The Work I’ve done are not flawless and could be improved provided enough time. Whatever believe my time spent in research and discovering it was well worth it and contributed to finding an acceptance solution to bulid a fully functional web Two main things are importance I learnted in java core are self motivation and mangement skills etc…….
- 25. THANKYOU