Found 4348 Articles for Java 8

Java Virtual Machine is an abstract computing machine which is used to run the java program. JVM accepts byte code, loads it and translates it into system understandable code.

Java uses javac (compiler) to convert the java code to byte code (.class file). Then, JVM internally converts the byte code to system understandable code using the interpreter in addition to it JVM. Instead of executing a piece of code, again and again, JVM identifies them as “hot spots” and compiles them using Just in time compiler and, later reuses the same when required. Just in Time compiler is a compiler which is used by JVM internally to translate the hot spots in the byte code to machine understandable code. The main purpose of JIT compiler is to do heavy ... Read More

Download the latest version of Java from the official site. Run the .exe to install Java on your machine. Once you installed Java on your machine, you will need to set environment variables to point to correct installation directories −Setting Up the Path for Windows:Assuming you have installed Java in c:\Program Files\java\jdk directory − Right-click on 'My Computer' and select 'Properties'.Click the 'Environment variables' button under the 'Advanced' tab.Now, alter the 'Path' variable so that it also contains the path to the Java executable. Example, if the path is currently set to 'C:\WINDOWS\SYSTEM32', then change your path to read 'C:\WINDOWS\SYSTEM32;c:\Program Files\java\jdk\bin'.Read More

Java uses javac (compiler) to convert the java code to byte code (.class file).When we run this code using JVM, it internally converts the byte code to system understandable code using an interpreter.Instead of executing a piece of code, again and again, JVM identifies them as “hot spots” and compiles them using Just in time compiler and, later reuses the same when required.A compiler compiles (translates) the given program to executable code (whole code at a time).A JIT compiler performs a similar task but it is used by JVM internally, to translate the hotspots in the byte code.A compiler compiles ... Read More

The javac command is used to compile Java programs, it takes .java file as input and produces bytecode. Following is the syntax of this command. >javac sample.java The java command is used to execute the bytecode of java. It takes byte code as input and runs it and produces the output. Following is the syntax of this command. >java sample Let us consider an example create a Sample Java program with name Sample.java Sample.java public class Sample { public static void main(String args[]) { System.out.println("Hi welcome ... Read More

You can create a JAR file using the following command.jar cf jar-file input-file(s)  You can also create JAR files using IDE’s. To create a JAR file using eclipse follow the procedure given below.Open the Jar File wizardThe Jar File wizard can be used to export the content of a project into a jar file. To bring up the Jar File wizard −In the Package Explorer select the items that you want to export. If you want to export all the classes and resources in the project just select the project.Click on the File menu and select Export.In the filter text box ... Read More

A java archive file is a file format/ archiving tool which contains all the components of an executable Java application. All the predefined libraries are available in this format. To include any of these (other than rt.jar) in to your project you need to set the class path for this particular JAR file. You can create a JAR file using the command line options or using any IDE’s. Creating a Jar file You can create a Jar file using the jar command as shown below. jar cf jar-file input-file(s) Let us consider an example, create a Sample Java ... Read More

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, If you have a ... Read More

The final modifier for finalizing the implementations of classes, methods, and variables. The main purpose of using a class being declared as final is to prevent the class from being subclassed. If a class is marked as final then no class can inherit any feature from the final class. You cannot extend a final class. If you try it gives you a compile time error. Example final class Super { private int data = 30; } public class Sub extends Super{ public static void main(String args[]){ } } Output ... Read More

When you compile Java programs using javac compiler it generates bytecode. We need to execute this bytecode using JVM (Java Virtual machine) Then, JVM translates the Java bytecode to machine understandable code.You can download JVM’s (comes along with JDK or JRE) suitable to your operating system and, once you write a Java program you can run it on any system using JVM.