difference between java and javac

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certainly! let's dive into the differences between `java` and `javac`, two essential components of java development.

overview

**javac**: this is the java compiler. it is used to compile java source code files (with the `.java` extension) into bytecode files (with the `.class` extension). the bytecode is platform-independent and can run on any machine that has a java virtual machine (jvm).

**java**: this command is used to run java applications. it executes the compiled bytecode (.class files) on the java virtual machine.

how they work together

1. **write java code**: you start by writing your java code in a `.java` file.
2. **compile the code**: you use `javac` to compile your `.java` file into a `.class` file.
3. **run the application**: finally, you use the `java` command to run the compiled bytecode.

example

let's create a simple java program to illustrate the usage of both commands.

step 1: write a java program

create a file named `helloworld.java` with the following code:



step 2: compile the java code

open a terminal (or command prompt) and navigate to the directory where your `helloworld.java` file is located. use the `javac` command to compile the code:



if the compilation is successful, this command will generate a file named `helloworld.class` in the same directory. if there are any syntax errors in your code, `javac` will output error messages to help you debug.

step 3: run the compiled code

now that you have the `helloworld.class` file, you can run your program using the `java` command:



you should see the output:



summary of differences

| feature | javac | java |
|---------------|------------------------------------|----------------------------------|
| purpose | compiles `.java` files to `.class` files | executes `.class` files |
| command type | compiler command | runtime command |
| input | source c ...

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