ConsoleReader.java

/**
 * ConsoleReader.java
 *   Reads input from the keyboard.
 *   This is useful for teaching students about basic input and
 *   output without scaring them away with the gritty details.
 * EXAMPLE:
 *     ConsoleReader console = new ConsoleReader(System.in);   
 *     String txt = console.readLine();    // returns a String 
 * -or-
 *     int num = console.readInt();        // returns an int
 * -or-
 *     Double num = console.readDouble();  // returns a double
 */
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.BufferedReader;
import java.io.IOException;
 
public class ConsoleReader {
    private BufferedReader reader;
 
    public ConsoleReader(InputStream inStream) {
	reader = new BufferedReader(new InputStreamReader(inStream));
    }
 
    public String readLine() {
	String inputLine = "";
 
	try {
	    inputLine = reader.readLine();
	}
	catch(IOException e) {
	    System.out.println(e);
	    System.exit(1);
	}
 
	return inputLine;
 
    }
 
    public int readInt() {
	String inputString = readLine();
	int n = Integer.parseInt(inputString);
	return n;
    }
 
    public double readDouble() {
	String inputString = readLine();
	double x = Double.parseDouble(inputString);
	return x;
    }
 
}