Table of Contents

Overview

We will practice basic programming in Java, discuss basic operations on data types like int and String, run the program, and examine the desired output.

Problem Statement

Declare 2 datatype variables and follow the steps below to write your program in Java.

Steps:
1.Declare 2 variables: one int, one String variable for example 20 , John ( or the name of your best friend.)
2.Add value 10 to the above integer and print.
3.Concatenate Hi to your best friend’s name and print.

Sample:
20
John

Desired Output

Sample output of your program should be :
30
Hi John

Try to practice the code in your fav IDE like Eclipse or IntelliJ.

Sample Code Snippet

public class Day2 {

 public static void main(String[] args) {
 // TODO Auto-generated method stub
 
 int i = 20 ;
 String s = "John" ;
 
 
 System.out.println(i + 10);
 System.out.println("Hi " + s);
 
 System.out.println("Another way :");
 
 System.out.println(i + 10 );
 System.out.println("Hi ".concat(s));
 }

}

Output :

30
Hi John
Another way :
30
Hi John

The System class contains several useful class fields and methods. It cannot be instantiated, since its constructor System() is not visible and not public.

The following facilities provided by the System class are standard input, standard output, and error output streams; access to externally defined properties and environment variables; a means of loading files and libraries; and a utility method for quickly copying a portion of an array.

Conclusion

Explore the class System methods and their usage. Also, a handy way to explore things is to look at the Java API.

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