How To Scan Input In Java

The best way to scan input in java includes the use of BufferedReader class, another method uses Scanner class but is slower, so here we will prefer BufferedReader.

The following code demonstrate the use of BufferedReader for scanning input of different type.

// file ScanInput.java
import java.io.*;
public class ScanInput{
	public static void main(String args[]) throws IOException{

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

		System.out.print("Enter a String: ");
		String msg=br.readLine();

		System.out.print("Enter a Integer: ");
		int integer=Integer.parseInt(br.readLine());

		System.out.print("Enter a Decimal Number: ");
		Float float_number=Float.parseFloat(br.readLine());

		System.out.println("String you entered is:"+msg);
		System.out.println("Integer you entered is:"+integer);
		System.out.println("Decimal Number you entered is:"+float_number);
	}
}

output is

Enter a String: Hello World!!
Enter a Integer: 12345
Enter a Decimal Number: 123.345221
String you entered is:Hello World!!
Integer you entered is:12345
Decimal Number you entered is:123.34522