How do you compiling a source code in java?

Answer 1

The javac command is used to invoke Java's compiler and compile a Java source file.

A typical invocation of the javac command would look like below:

javac [options] [source files]

Both the [options] and the [source files] are optional parts of the command, and both allow multiple entries. The following are both legal javac commands:

javac -help

javac ClassName.java OneMoreClassName.java

The first invocation doesn't compile any files, but prints a summary of valid options. The second invocation passes the compiler two .java files to compile (ClassName.java and OneMoreClassName.java). Whenever you specify multiple options and/or files they should be separated by spaces.

This command would create the .class files that would be require to run the java progam.

Answer 2

For Windows and Dos:

1. Install the Java Development Kit (JDK) fromthe Java or Oracle web site into C:\ drive.

2. Set path by giving following command path = %path%;c:\jdk1.3\bin;c:\jdk1.3\lib with your proper version of JDK(i.e. jdk1.2.2 or jdk1.2 etc).

3. Write simple program in Edit of Dos or Notepad with "class_name.java". Here class_name is the name of file you used in your program with the keyword class. Remember that Java is case sensitive.

4. Compile the program with the command "javac class_name.java". If there are compile errors, fix the source and repeat this step again until it works.

5. Run this command "java class_name". If the program does not work correctly , review the code, fix the errors and repeat step 4 above.

Answer 3

When you install Java, you get the Java compiler: javac.

To compile a Java source file you can run:

javac MyClass.java

On Terminal Mac I write:

cd Desktop

javac myClass.java

cd = change directory followed by the directory of the java file (I have chosen the Desktop) push enter.

write javac (Java Compile) followed by the java files name and extension and push enter (this will create a .class file to the Desktop).

Answer 4

Compiling Java Programs

The javac command is used to invoke Java's compiler and compile a Java source file.

A typical invocation of the javac command would look like below:

javac [options] [source files]

Both the [options] and the [source files] are optional parts of the command, and both allow multiple entries. The following are both legal javac commands:

javac -help

javac ClassName.java OneMoreClassName.java

The first invocation doesn't compile any files, but prints a summary of valid options. The second invocation passes the compiler two .java files to compile (ClassName.java and OneMoreClassName.java). Whenever you specify multiple options and/or files they should be separated by spaces.

Running Java Programs

The java command is used to invoke the Java virtual machine. This command invokes the JVM and asks it to run the program that is specified in the argument.

java [options] className [args]

The [options] and [args] parts of the java command are optional, and they can both have multiple values. You must specify exactly one class file to execute, and the java command automatically assumes that you're going to send only a .class file, so you don't have to specify the .class extension on the command line. Here's an example:

java MyTestClass 1 2 3

The above command invokes the .class file of our test class MyTestClass and passes 1, 2 and 3 as command line arguments.

For fun, just assume that the hypothetical code inside MyTestClass expects 3 command line arguments. Don't worry, am not going to bore you with the code of that class here…

Answer 5

javac somefile.java

^that will compile

java somefile.java

^that will execute

Answer 6

javac programname.java