javainput

How to get the user input in Java?

I attempted to create a calculator, but I can not get it to work because I don't know how to get user input.

How can I get the user input in Java?

Solution

  • You can use any of the following options based on the requirements.

    Scanner class

    import java.util.Scanner; 
//...
Scanner scan = new Scanner(System.in);
String s = scan.next();
int i = scan.nextInt();

    BufferedReader and InputStreamReader classes

    import java.io.BufferedReader;
import java.io.InputStreamReader;
//...
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String s = br.readLine();
int i = Integer.parseInt(s);

    DataInputStream class

    import java.io.DataInputStream;
//...
DataInputStream dis = new DataInputStream(System.in);
int i = dis.readInt();

    The readLine method from the DataInputStream class has been deprecated. To get String value, you should use the previous solution with BufferedReader

    Console class

    import java.io.Console;
//...
Console console = System.console();
String s = console.readLine();
int i = Integer.parseInt(console.readLine());

    Apparently, this method does not work well in some IDEs.