Reading Input Through Scanner Class

[sreekandank]

Java provides the classes and methods that supports to read input and print output. To read the input, you first construct a Scanner that is attached to the standard input stream System.in.

Scanner in=new Scanner(System.in);

Methods of Scanner class:

• nextLine() - to read a line of input
• next() - to read a single word
• nextInt() - to read an integer
• nextDouble() - to read an double floating point number

For example, the following code used to read a line of input:

System.out.println("Enter Your Name:");
Scanner in=new Scanner(System.in);
String name=in.nextLine();

ScannerDemo.java

import java.util.*;
/**
 *@author Sreekandan.K
*/
class ScannerDemo
{
 public static void main(String args[])
 {
  Scanner in=new Scanner(System.in);
  System.out.println("What is ur name..?");
  String name=in.nextLine();
  System.out.println("What is ur age..?");
  int age=in.nextInt();
  System.out.println("Hello Mr."+name+",Your Age Is:"+age);
 }
}

Note: To be run this program in JDK1.5 or Higher version.