JDK

Source: Dev.to

What is JDK?

JDK is a complete software package used to develop Java applications.
It contains tools to write, compile, debug, and run Java programs.

When is JDK used?

• When you are writing Java code.
• When you are compiling a Java program.
• During development time.

How JDK is used?

1. Write a .java file.
2. Use javac (the compiler from the JDK) to convert it to a .class file.
3. Run the program using the java command.

Example

// Hello.java
public class Hello {
    public static void main(String[] args) {
        System.out.println("Hello, world!");
    }
}

javac Hello.java
java Hello