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Compilation of Java Program

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Compilation of Java Program Compilation of Java program is necessary before its execution. Javac is the compiler of java which compiles the source code of java program and JVM is the interpreter which generates machine code from the compiled source code. Compiling a java program we need a compiler known as JAVAC . See how to compile a java program in java programming. Compilation of a java program contains following steps- 1-Type your java program in a text editor. 2-Save it with the name of class with .java extension in your java program. 3-Now open command prompt and go to directory in which your java program has been saved. 4-Set the path of javac using set path=”path” 5-Type javac and enter file name with .java extension and press enter. 6-If your program is error free it will generate one or more .class file. 7-Type java and then file name without any extension and press enter. Now you will see output. For example if your java progr...
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Basic Data Types in Java

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Definition of Basic Data Types in Java: Datatype  (data-types) is the name of storage format which store the specific type's and its corresponding range's value. Different data types have been defined by java. These data types are frequently  used  by programmers. Data types in java are used to specify whether which type of value will be stored in specified variable. A variable is responsible for storing the particular value. But a variable does not store value itself. Variable is just a name for a memory location where a value is to be stored.Java has been defined different types of basic data types. We categorize them broadly into 2 category. There are defined two types of data types in java- Primitive Data Types Non-Primitive/Reference Data Types Primitive Data Types: Primitive means ancient. As its meaning states Primitive Data Types are defined already in the Java API. Programmers can use th...
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Internal working of JVM(Java Virtual Machine)

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Internal working of  Java Virtual Machine (JVM)  in java Programming Java:Internal Working of JVM(Java Virtual Machine). Let us describe what is the internal working of Java Virtual Machine(JVM) in java-programming. I am describing here what happens internally in the JVM when a java-program is executed. Working of Java Virtual Machine is described below- Working of Java Virtual Machine(JVM):- To load .class file from hard disk to RAM by the Class Loader Subsystem and stored into method memory area only once. To allocate the memory for all the static member of the specified class. If in specified class there is a static variable without initialized then JVM sets the default value of corresponding data type. If a class contains static blocks, then they executes in top to bottom order. Now control moves to the main method. Above five steps defines the internal working of JVM(Java Virtual Machine) when a java-program is executed.  .
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