1.4 Additional Knowledge

1. Class name can be different as the file name.

class A{
    public static void main(String args[])
    {
         System.out.println("Test");
    }
}

Save it as B.java
after compiling B.java  -----  javac B.java
you'll get a class file with name A.class. To run this code you have to write java A instead of java B.

2. Comments

/*
Multiple line comments
Multiple line comments

*/

// Single line comment

3. Concatenation operator = "+"

int a,b,c;

a=5;

b=5;

c=a+b;

System.out.println("Addition of "+a+ " and "+b+" is "+c);

4. printf in java

System.out.printf("Addition of %d and %d is 5d",a,b,c);