Add two numbers in Java

Step 1: Let's open a notepad and write the following code.
//Code
  1. class demo {
  2. public static void main(String arg[]) {
  3. int a = 10, b = 20, c = 0;
  4. c = a + b;
  5. System.out.println("sum of two no is :" + c);
  6. }
  7. }
Step 2: Name it as "ab.java" and save the file on any location. I saved at "C:\app".
Step 3: Open command prompt (Press Window + R and write cmd and hit OK).
a
Step 4: Go to "C:\app" by using command prompt
s
Step 5: Now write the following code for checking my java file is compiling or not.
javac ab.java
d
My java program compiled successfully.
Step 6: Write the following code in command prompt. Press enter and see the output.
java demo
// demo is a class name that is written in my ab.java file.
Output
f
Happy Coding.