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Java > Learn Java > How can I execute a Java program?
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How can I execute a Java program?

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Through command-line 1.compile the code using javac filename.java 2. Finally run the code using java filename here filename is classname. If u use eclipse then right click the java code n select run as java application .
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Java source code is compiled into bytecode when we use the javac compiler. The bytecode gets saved on the disk with the file extension .class . When the program is to be run, the bytecode is converted, using the just-in-time (JIT) compiler. The result is machine code which is then fed to the memory and...
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Java source code is compiled into bytecode when we use the javac compiler. The bytecode gets saved on the disk with the file extension .class . When the program is to be run, the bytecode is converted, using the just-in-time (JIT) compiler. The result is machine code which is then fed to the memory and is executed. read less
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Running a Java Program from Command Prompt ------------------------------ Create a temporary folder C:\mywork. Using Notepad or another text editor, create a small Java file HelloWorld.java with the following text: public class HelloWorld { public static void main(String args) { System.out.println("Hello,...
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Running a Java Program from Command Prompt ------------------------------ Create a temporary folder C:\mywork. Using Notepad or another text editor, create a small Java file HelloWorld.java with the following text: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World!"); } } Save your file as HelloWorld.java in C:\mywork. To make sure your file name is HeloWorld.java, (not HelloWorld.java.txt), first choose "Save as file type:" All files, then type in the file name HelloWorld.java. Run Command Prompt (found under All Programs/Accessories in the Start menu). Type C:\> cd \mywork This makes C:\mywork the current directory. C:\mywork> dir This displays the directory contents. You should see HelloWorld.java among the files. C:\mywork> set path=%path%;C:\Program Files\Java\jdk1.8.0_51\bin (use the JDK folder for the version installed on your system). This tells the system where to find JDK programs. C:\mywork> javac HelloWorld.java This runs javac.exe, the compiler. You should see nothing but the next system prompt... C:\mywork> dir javac has created the HelloWorld.class file. You should see HelloWorld.java and HelloWorld.class among the files. C:\mywork> java HelloWorld This runs the Java interpreter. You should see the program output: Hello, World! If the system cannot find javac, check the set path command. read less
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At Dos prompt , write following commands Javac filename E.g. Javac x.java To run program after compilation Write following code Java filename E.g. Java x
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Download and install the latest version of the Java Platform, Standard Edition Development Kit (Java SE 6 Update 27). Note the installation directory for later—probably something like C:\Program Files\Java\jdk1.6.0_27\bin. To make sure that Windows can find the Java compiler and interpreter: Select Start...
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Download and install the latest version of the Java Platform, Standard Edition Development Kit (Java SE 6 Update 27). Note the installation directory for later—probably something like C:\Program Files\Java\jdk1.6.0_27\bin. To make sure that Windows can find the Java compiler and interpreter: Select Start -> Computer -> System Properties -> Advanced system settings -> Environment Variables -> System variables -> PATH. [ In Vista, select Start -> My Computer -> Properties -> Advanced -> Environment Variables -> System variables -> PATH. ] [ In Windows XP, Select Start -> Control Panel -> System -> Advanced -> Environment Variables -> System variables -> PATH. ] Prepend C:\Program Files\Java\jdk1.6.0_27\bin; to the beginning of the PATH variable. Click OK three times. Then Compile the Program From the Command Prompt, navigate to the directory containing your .java files, say C:\introcs\hello, by typing the cd command below. C:\Users\username>cd c:\introcs\hello C:\introcs\hello\> Assuming the file, say HelloWorld.java, is in the current working directory, type the javac command in boldface below to compile it. C:\introcs\hello\>javac HelloWorld.java C:\introcs\hello\> Execute the Program From the Command Prompt, type the java command below. C:\introcs\hello\>java HelloWorld Hello, World If all goes well, you should see the output of the program - Hello, World. read less
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