I am using NetBeans IDE 7.4 and I am very new to Java and I am trying to get the user to input two numbers (both of them are doubles) and then store them in another variable. I have gone to DOZENS of tutorial sites and they are no good. How can I get basic input and outputs?
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2 Answers
Primitive example:
import java.util.Scanner;
public class TestIO {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Print something:"); // printing output
String text = scanner.nextLine(); // taking input
System.out.println("You have printed the following text: " + text);
}
}
UPDATE:
Sorry, missed the point, that you want to take doubles. Here you go:
import java.util.Scanner;
import java.util.InputMismatchException;
public class TestIO {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double firstDouble = 0L;
double secondDouble = 0L;
while (true) { // take input (two doubles) until successful
System.out.println("Print two doubles (press enter after each input):");
try {
firstDouble = scanner.nextDouble();
secondDouble = scanner.nextDouble();
} catch (InputMismatchException e) {
System.out.println("Wrong input. You must print doubles.\n" +
"Depending on your locale, as a decimal separator " +
"use either a comma or a dot.\n");
scanner.nextLine(); // clearing the buffer with the wrong input
// to avoid infinite loop
continue;
}
break;
}
// Printing the user input (limiting doubles to 3 decimal places)
System.out.format("You have printed %.3f and %.3f %n",
firstDouble, secondDouble);
}
}
Recommended reading:
- the official Oracle Java Tutorials - it's very informative and easy to understand
- Lesson: Basic I/O (from the above tutorials)
2 Comments
slackmart
double d1 = Double.parseDouble(text);
informatik01
@sgmart Yeah, there're lots of variations. I just threw some basic example ))
import java.util.*;
public class Test
{
static Scanner console = new Scanner (System.in)
public static void main (String[] args)
{
double input1, input2; // Declares the double value of input1 and input2
input1 = console.nextDouble(); // User inputs value into input1
input2 = console.nextDouble();
String value1 = "" + input1; // Storing value into a String
String value2 = "" + input2;
// If you want to store it in let's say string.
// Or else i think / int value1 = Integer.parseInt(input1);
// This changes the double value into an Int value
// Something like that.
}
}
Not quite sure if that was your question because outputting a value could also be with
System.out.println(input1); // This outputs the value of input1 on the screen.