Question

Investigate 3 method from the scanner class (java.util package )

- List them and briefly describe their purpose

- show (code) examples using them

You will need to type this report using MS word submit your report that includes source code examples with their output.

Answer 1

Scanner class:-

It is used to create an object which is used to read/take data from the keyboard.

Java Scanner class extends Object class and implements Iterator and Closeable interfaces.

It is found in Java.util. Package.

We need to import this package before using the methods of this class.

Ex:- Scanner obj_name = new Scanner(System.in).

System.in the reference of the keyboard.

Methods in the Scanner class:-

Example :-

// creating object for the scanner class.

Scanner obj = new Scanner(System.in);

1) Int nextInt():-

Description:- It is used to read integer from the keyboard.

Syntax:- Scanner obj_name .nextInt().

Example:- obj .nextInt()

2)Int nextFloat():-

Description:- It is used to take float type from the keyboard.

Syntax:- Scanner obj_name .nextFloat().

Example:- obj .nextFloat()

3)String nextLine():-

Description:- It is used to take string from the keyboard.

Syntax:- Scanner obj_name .nextLine();

Example:- obj.nextLine();

Program for Scanner class methods:-

First compile the java file :- javac HomeworkLibjava.java

It will create a HomeworkLibjava.class file

Then run the file :- java HomeworkLibjava

//import the package for the Scanner class methods

import java.util.*;

class HomeworkLibjava{

public static void main(String []args){

String fname;

int number;

float marks;

//creating object of Scanner class

Scanner obj = new Scanner(System.in);

System.out.print("Enter your full name:- ");

//take name from the user by keyboard

fname = obj.nextLine();

System.out.print("Enter your favourite integer:- ");

//take number(integer) from the user by keyboard

number= obj.nextInt();

System.out.print("Enter your marks:- ");

//take marks(float) from the user by keyboard

marks = obj.nextFloat();

System.out.println("Full Name: " + fname + ", number: "+ number+ ", Marks: "+ marks);

}

}

output:-

Enter your full name:- HomeworkLib.com

Enter your favourite integer:- 123

Enter your marks:- 99.9

Full Name: HomeworkLib.com, number: 123, Marks: 99.9