Java is an Object Oriented,High level, Robust and Secured programming language. Java Application Running on 3+ billions devices.
Java team members developed a language for digital devices such as televisions, set-top boxes etc. Now a days, Java is widely used in online programming, mobile devices, video games, e-business etc.
Java language is simple because mostly syntaxlike C++ . Java removed pointers, operator overloading etc. No need Java has Automatic Garbage Collection which removes non referenced objects .
Open an editor like: Notepad, Sublime etc and write. Go to command prompt: (javac for compile and java for run).
Data types in Java:1- Primitive data types: The primitive data types include boolean, char, byte, short, int, long, float and double. 2- Non-primitive data types: The non-primitive data types include Classes, Interfaces, and Arrays.
Java Operators is a symbol which is used to perform operations. Java Operators has defined such as unary operator, arithmetic […]
A keyword is a reserved word. You cannot use it as a variable name, constant name etc. Ex: int, char, float, for, while etc.
Variable allocates reserved memory area. char ch=’A’;//chis variable | int num=10;//num is variable | Types of Variable 1-Local Variable is declared inside the method. 2-Instance Variable is declared inside the class but outside the method. 3- Static variable is declared as with static keyword.
Type casting is when you assign a value of one primitive data type to another type. In Java, there are two types of casting: Widening Casting (automatically) – converting a smaller type to a larger type size
Java Comments can be used to help for description the code. It will never show on run time. Single-line comments It starts with two forward slashes (//). Java Multi-line Comments. More than one line comments start with /* and ends with */.
if Statement Use the if statement to specify a block of Java code to be executed if a condition is […]
Java switch statement is used to select one of many code blocks to be executed. How to Java switch works: Matching each expression with case Once it match, execute all case from where it matched. Use break to exit from switch Use default when expression does not match with any case
When we want to execute a block execute multiple time then we use loop.It executes until condition is true. The while executes a block of code as long as a given condition is true.
When we want to execute a block execute multiple time then we use loop.It executes until condition is true. The do - while executes a block of code as long as a given condition is true.
When we want to execute a block execute multiple time then we use loop.It executes until condition is true. The for executes a block of code as long as a given condition is true. It has multiple statements. This is very popular in all loops.
Java break is keyword which is used to going out from "switch" and loops(while, do-while, for). Java continue is also a keyword which is used to going to next condition in loops(while, do-while, for) and going to next case in switch.
Java Tokens are the smallest individual building block or smallest unit of a Java program; the Java compiler uses it for constructing expressions and statements. Java program is a collection of different types of tokens, comments, and white spaces.
In programming languages, identifiers are used for identification purpose. In Java, an identifier can be a class name, method name, […]
Literals A constant value in Java is created by using a literal representation of it. For example, here are some […]
In Java, there are a few characters that are used as separators. The most commonly used separator in Java is […]
ASCII defines 128 characters, which map to the numbers 0–127. Unicode defines (less than) 221 characters, which, similarly, map to […]
This Java Development Kit(JDK) allows you to code and run Java programs. It’s possible that you install multiple JDK versions […]
Objects that are instances of an inner class exist within an instance of the outer class.
If you've never used an object-oriented programming language before, you'll need to learn a few basic concepts before you can begin writing any code. This lesson will introduce you to objects, classes, inheritance, interfaces, and packages. Each discussion focuses on how these concepts relate to the real world, while simultaneously providing an introduction to the syntax of the Java programming language.
Java is an Object Oriented Programming language. There are many object oriented features in java such as Inheritance, Polymorphism, Abstraction, Encapsulation etc. The first object-oriented programming language is Simula. Java is known as truly object-oriented programming language because all java programs is written in class.
Java String is an object that represents sequence of char values.Java implements strings as objects of type String. An array […]
The java string charAt() method returns a char value at the given index number. The index number starts from 0 and goes to […]
The java string compareTo() method compares the given string with current string lexicographically. It returns positive number, negative number or […]
The java string concat() method combines specified string at the end of this string. It returns combined string. It is […]
The java string contains() method searches the sequence of characters in this string. It returns true if sequence of char […]
The java string equals() method compares the two given strings based on the content of the string. If any character […]
The String equalsIgnoreCase() method compares the two given strings on the basis of content of the string irrespective of case […]
The java string format() method returns the formatted string by given locale, format and arguments. If you don’t specify the […]
The java string getBytes() method returns the byte array of the string. In other words, it returns sequence of bytes. […]
The java string getChars() method copies the content of this string into specified char array. There are 4 arguments passed […]
The java string intern() method returns the interned string. It returns the canonical representation of string. It can be used […]
The java string isEmpty() method checks if this string is empty or not. It returns true, if length of string […]
The java string join() method returns a string joined with given delimiter. In string join method, delimiter is copied for […]
The java string lastIndexOf() method returns last index of the given character value or substring. If it is not found, […]
The java string length() method length of the string. It returns count of total number of characters. The length of […]
The java string replace() method returns a string replacing all the old char or CharSequence to new char or CharSequence. […]
Java constructor is similar to the method. It calls when an object(instance) of a class is created. Allocated in the […]