In this chapter you will learn:

1. How to get Integer Input?
2. How to get String Input?
3. How to get Float Input?

This chapter demonstrates how to get user input in java. Various times while programming in java you need to accept some value from the user end. This value might be integer, string or float. As a java programmer you must know the input mechanism of java. Once you will finish this chapter, I am sure you will be master in accepting input in Java.

How to get user input in java?

To get input in java there are several classes which allow you to accept user end data but the most popular way is using Scanner Class.

Scanner Class

It is the most popular way to accept user input. Scanner class uses following method to accept different types of data. You must import java.util.Scanner class before using scanner method.

 Scanner sc=new Scanner(System.in);
 

Here we are writing a program which accept some user input and print the output. The program will ask following details from the user.

Name:
Age:
Mobile No:
Sex:
Qualification:

Programming Example

//You must write this line here for using Scanner class in program
import java.util.Scanner;

class ScannerClass
{
  public static void main(String[] args)
  {
    String name;
    int pin;
    Short age;
    Long mobileNumber;
   
    
    //Initializing Scanner Class
    Scanner sc=new Scanner(System.in);
    
    //Getting User Details
    System.out.println("Enter Your Name: ");
    name=sc.nextLine();   
    System.out.println("Enter your 4 Digit Pin Number: ");
    pin=sc.nextInt();
    System.out.println("Enter your age: ");
    age=sc.nextShort();    
    System.out.println("Enter your Mobile Number: ");
    mobileNumber=sc.nextLong();
    
    //Printing User Details
    System.out.println("********************User Details**********************");
    System.out.println("Name : " + name);
    System.out.println("Pin : " + pin);
    System.out.println("Age : " + age);
    System.out.println("MobileNumber : " + mobileNumber);
  
  }
}

Output

Explanation

In the above example we added Scanner Library to program so that we can use Scanner class.

 //You must write this line here for using Scanner class in program
 import java.util.Scanner;

After that we have used several Scanner Object methods for accepting different types of value as

  name=sc.nextLine(); //For accepting string
  pin=sc.nextInt(); //For accepting integer
  age=sc.nextShort(); //For accepting short
  mobileNumber=sc.nextLong(); //For accepting Long

Summary