Java is not dependent on any specific operating system so Java applications cannot depend on the platform dependent native libraries, therefore, instead of those Java provides a set of dynamically loaded libraries that are common to modern operating systems.These libraries provide –Container classes and Regular Expressions.Interfaces for tasks that depend on the hardware of the OS such as network and file access.In case, the underlying platform does not support certain feature of Java then, these libraries surpass that specific feature if needed.

In Java, we can write a class within a method and this will be a local type. Like local variables, the scope of the inner class is restricted to the method.A method-local inner class can be instantiated only within the method where the inner class is defined. The following program shows how to use a method-local inner class.ExampleLive Demopublic class OuterClass {    public void display(){       int num = 23;       class Inner{          public void print() {             System.out.println("This is method inner class "+num);     ... Read More

The Object class of the java.lang package is the root class in Java i.e. It is the super class of every user-defined/predefined class n Java. All objects, including arrays, implement the methods of this class. The reason for this is to have common functionalities such as synchronization, garbage collection, collection support, object cloning for all objects in Java. The class named Class of java.lang package provides a method named getSuperclass() this method returns the Class representing the superclass of the current Class. So, Create a sample concrete class and try to get the name of its super class using this ... Read More

The full form of API is Application Programming Interface. It is a document which gives you the list of all the packages, classes, and interfaces, along with their fields and methods.Using these API’s, the programmer can know how to use the methods, fields, classes, interfaces provided by Java libraries.

Following are the notable differences between inner classes and static inner classes.Accessing the members of the outer classThe static inner class can access the static members of the outer class directly. But, to access the instance members of the outer class you need to instantiate the outer class.Examplepublic class Outer {    int num = 234;    static int data = 300;    public static class Inner{       public static void main(String args[]){          Outer obj = new Outer();          System.out.println(obj.num);          System.out.println(data);       }    } ... Read More

Java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. Java programs can carry an extensive amount of run-time information that can be used to verify and resolve accesses to objects at run-time.

Unlike many other programming languages including C and C++, when Java is compiled, it is not compiled into platform specific machine, rather into platform-independent byte code. This byte code is distributed over the web and interpreted by the Virtual Machine (JVM) on whichever platform it is being run on. Thus when you write a piece of Java code in a particular platform and generated an executable code .class file. You can execute/run this .class file on any system the only condition is that the target system should have JVM (JRE) installed in it. In short, Java compiler generates an architecture-neutral ... Read More

Java runs on operating systems such as Windows, Mac OS, and the various versions of UNIX/Linux like HP-Unix, Sun Solaris, Redhat Linux, Ubuntu, CentOS, etc.

Java Standard Edition provides 14 packages namely –applet − This package provides classes and methods to create and communicate with the applets.awt− This package provides classes and methods to create user interfaces.beans− This package contains classes and methods to develop components based on java beans. io− This package contains classes and methods to read and write data standard input and output devices, streams and files.lang− This package contains the fundamental classes, methods, and, interfaces of Java language.math− This package contains classes and methods which helps you to perform arithmetic operations using the Java language.net− This package provides classes to implement networking ... Read More

A fully object-oriented language needs to have all the 4 oops concepts. In addition to that, all predefined and, user-defined types must be objects and, all the operations should be performed only by calling the methods of a class.Though java follows all the four object-oriented concepts,Java has predefined primitive data types (which are not objects).You can access the members of a static class without creating an object of it.Therefore, Java is not considered as fully object-oriented Technology.