How to take input in Java

 Java is an object oriented programming language. In java there are two ways to take the input .

1. Scanner class 

2. BufferedReader class

We use these two classes to take input . Let's see these two one by one.

Scanner Class : It is most used class for the primitve data types. Basically it is text reader which parse the data to the primitive type . To use the Scanner  class we use import java.util.Scanner

Scanner class non-synchronous so it is not used in case of multiple threads . Let's take an example for the scanner class.

import java.util.Scanner;

class HindiCodingCommunity{

public static void main(String args[]){

Scanner sc = new Scanner(System.in);

// To take the string input

String str = sc.nextLine();

System.out.println(str);

// To take the integer input

int intval = sc.nextInt();

System.out.println(intval);

// To take the float input

float floatval = sc.nextFloat();

System.out.println(floatval);

}

}

Input Types for Scanner :

nextBoolean() It reads a boolean value 

nextByte() It reads a byte value

nextDouble() It reads a double value 

nextFloat() It reads a float value

nextInt()         It reads a int value 

nextLine() It reads a String value 

nextLong() It reads a long value 

nextShort() It reads a short value 

BufferedReader Class : It is not mostly  used class for the primitve data types. It is used in case of Multiple threads .  To use the Buffered Reader class we use import java.io.*

Buffered Reader  class is synchronous so it is used in case of multiple threads . Also it is faster than the Scanner class . So Let's take an example for the Buffered Reader class.

import java.io.*;

class HindiCodingCommunity{

public static void main(String args[]) throws IOException{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

// To take the string input

String str = br.readLine();

System.out.println(str);

// To take the integer input

int intval = Integer.parseInt(br.readLine());

System.out.println(intval);

// To take the float input

float floatval = Float.parseFloat(br.readLine());

System.out.println(floatval);

}

}

In this way we can take the input in Java.

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