NetBeans 8 Basic Console Input Output [CIO]
STEPS
1) Start NetBeans.
2) Create a new project.
2-1) Select Java Application.
2-2) Type the name MyConsole1.
2-3) Project is created.
3) Edit Codes
3-1) Replace the line “// TODO …” with the following codes.
Scanner sc = new Scanner(System.in); System.out.print("Please enter your weight: "); int weight = sc.nextInt(); System.out.println("Weight = " + weight); |
Press SHIFT-ALT-F to realign your codes.
3-2) Notice some syntax errors.
3-3) If you hover your mouse over the red underlined text, you will get some help message.
3-4) Choose “Add import for java.util.Scanner”
3-5) NetBeans add the import line.
3-6) Run.
3-6-1) You will see the prompt “Please enter your weight:”
3-6-2) Click an area just after the colon, type 60 and press ENTER key.
3-7) Run again but this time enter “sixty” instead of a number 60.
3-8) You will get an error message.
3-9) Replace the codes in Step 3-1.
Scanner sc = new Scanner(System.in); System.out.print("Please enter your weight: "); int weight; // Accept input and test to see if it’s an integer if (sc.hasNextInt()) { // Success, it was an integer so get it weight = sc.nextInt(); System.out.println("Weight = " + weight); } else { // Failure so retrieve the input as a String String bad = sc.next(); // Inform the user what went wrong System.out.println(bad + " cannot be converted to an integer"); } |
3-10) Run.
3-11) Enter “sixty”.
3-12) Finally, replace the current codes with the following
Scanner sc = new Scanner(System.in); System.out.println("Select an Account"); System.out.println("A: Savings"); System.out.println("B: Checking"); System.out.println("C: Exit"); System.out.print("Please choose A, B or C: "); char letter; if (sc.hasNext("[A-Ca-c]")) { String choice = sc.next(); letter = choice.toUpperCase().charAt(0); System.out.println("You chose: " + letter); } else { String choice = sc.next(); System.out.println(choice + " is not valid input"); } |
3-13) Outcome:
Source: http://netbeans.dzone.com/nb-class-console-input-regular-exp