Java Tutorials

Abstraction in Java In simple words, abstraction captures only those details about an object that are relevant to the current perspective. Learn more about abstraction in java. Access Modifiers in Java Java Access Specifiers (also known as Visibility Specifiers) regulate access to classes, fields and methods in Java. They can also be called Access Modifiers. Arrays in Java Array is a data structure which stores a fixed-size sequential collection of elements of same type. In General, arrays are collection of elements of similar type. Collection Framework in Java The collection framework in java is made up of classes and interfaces that stores and processes data in an efficient manner. Collection Framework in Java The collection framework in java is made up of classes and interfaces that stores and processes data in an efficient manner. The Sun Microsystems has introduced collection framework in Java 2.0. Collection Revisited in Java The collection framework in java is made up of classes and interfaces that stores and processes data in an efficient manner. This chapter is specially designed to know what all there is in Collection at very advanced level and how it is used in the industry and in business projects. Collection Revisited in Java This Chapter is specially designed to know what all there is in Collection at very advanced level and how it is used in the industry and in business projects. Communication Between Two Classes in Java In java we can call the members of one class from another class by creating an object. This is called communication between two classes. Constructor in Java Constructor in Java: It is a block of code that initializes the newly created object. Types: Default and Parameterized constructor, java copy constructor. Control Statements in Java A Control statement in Java works as a determiner for deciding the next task of the other statements whether to execute or not. Database Constraints Constraints are the rules enforced on the data columns of a table. They ensure the accuracy and reliability of the data in the database. Database Group by & Having Clause The Group by clause is used to divide table into multiple groups based on specified columns. The having clause is used to specify the condition placed on groups. Database Joins A Join statement is used to combine data or rows from two or more tables based on a common field between them. Database PL/SQL PL/SQL is a programming long with SQL which allows you to write sets of statements as one block called as a PL / SQL block. Database SQL Commands SQL commands are instructions. It is used to communicate with the database. It is also used to perform specific tasks, functions, and queries of data. Database Subquery A subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved. Database Views A view is a searchable object in database that is defined by a query. A view can combine data from two or more table, using joins, and contain a subset of information. Database in Java A database is a data structure that stores organized information. Most databases contain multiple tables, which may each include several different fields. Encapsulation in Java Encapsulation in Java is a mechanism of wrapping the data (variables) and code acting on the data (methods) together as a single unit. Exception in Java Exceptions are events occurring during a program execution which interrupt the regular flow of data. Final Keyword in Java Final Keyword is used in different contexts. First of all, final is a non-access modifier applicable only to a variable, a method or a class. Garbage Collection in Java The Java Garbage Collector finds unused objects and deletes them to free up memory. Read about how Java garbage collection works, and why it matters. Inheritance in Java Inheritance can be defined as the process where one class acquires the properties (methods and fields) of another. Input and Output Streams in Java Java - I/O - The java.io package contains nearly every class you might ever need to perform input and output (I/O) in Java. Introduction to Java Java is an object-oriented, multi-purpose programming language produced by Sun Microsystems in 1995. It was developed to be a machine independent web technology. Learn Java in detail on java by kiran tutorial. JDBC (Java Database Connectivity) JDBC is a Java API that can access any kind of tabular data, especially data stored in a Relational Database. JDBC works with Java on a variety of platforms. JVM (Java Virtual Machine) Memory Management The JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java byte code can be executed. Java Annotations Java annotations are essentially tags used to provide Meta data for your Java code. These are extra details that can be utilised by the java compiler or JVM. Java Development Kit - jdk1.5 jdk 1.5 - The JDK includes tools useful for developing and testing programs written in the Java programming language and running on the JavaTM platform. Java Development Kit - jdk1.6 jdk 1.6 - The JDK includes tools useful for developing and testing programs written in the Java programming language and running on the JavaTM platform. Java Development Kit - jdk1.7 jdk 1.7 - The JDK includes tools useful for developing and testing programs written in the Java programming language and running on the JavaTM platform. Java Development Kit - jdk1.8 jdk 1.8 - The JDK includes tools useful for developing and testing programs written in the Java programming language and running on the JavaTM platform. Java Language Java programming language was developed by the Sun Microsystems and was launched in 1995. The language has had many versions, the latest is Java SE 8. Literals in Java Literals are syntactic representations of boolean, character, numeric, or string data. In other words, Literals are value which we can assign to variable or constant. Methods, Variable and Block in Java A method is like a subprogram, which when invoked returns a value. In other words, a method is a collection of words or commands that joined to perform a function. Multithreading in Java Multithreading in java is a process of executing two or more threads simultaneously to maximum utilization of CPU. Operators in Java Java Operator is a special type of symbol that is used to perform operations. Package in Java A package in Java is a mechanism to contain classes, sub packages or interfaces. Polymorphism in Java Java - Polymorphism - Polymorphism is the ability of an object to take on many forms. Polymorphism is useful in carrying out inheritance processes in java. Reflection in Java Reflection in java is an API that examines or modifies the behavior of classes, methods, fields and interfaces during runtime. Serialization in Java Serialization is a mechanism of converting the state of an object into a byte stream. By implementing Externalizable interface we can persist and restore the object. Static Keyword in Java Static in Java is a keyword that indicates that variables or functions are shared between all the instances of a particular class since it belongs to type, not object. Strings in Java Generally, String is a sequence of characters. But in java, String is an object that represents a sequence of characters. String class is used to create string object. Super This keyword in Java Super Keyword is used to access methods of the parent class while this is used to access methods of the current class.