Steps for Data Input

1. Using BufferedReader

                ==> Without the try-catch block

                a. Input Data String
                                public static void main (String [] args) throws IOException {
                                                InputStreamReader reader = new InputStreamReader (System.in);
                                                BufferedReader input = new BufferedReader (reader);
                                                System.out.print ("Enter Any Word =");
                                                String text = input.readLine ();

          b. Input Data Characters
                                public static void main (String [] args) throws IOException {
                                                BufferedReader input = new BufferedReader (new InputStreamReader (System.in));
                                                System.out.print ("Enter Any Word =");
                                                char ch = (char) br.read () ;/ / for character
               
                                / * Can also tipedata first declaration, that is
                                                new char ch then ch = (char) br.read () * /                           

                                / * The following statement is the same
                                A. InputStreamReader reader = new InputStreamReader (System.in);
                                                BufferedReader input = new BufferedReader (reader);
                                                -> Reader = new InputStreamReader (System.in) <-

2. BufferedReader input = new BufferedReader
                                (New InputStreamReader (System.in));

                 ==> With the try-catch block

                                BufferedReader dataInput = new BufferedReader (new InputStreamReader (System.in));
                                System.out.print ("Enter Any Word =");
                                String text = "" ;/ / String variable declaration
                                try {
                                dataInput.readLine = text () ;/ / read a string
                                } Catch (IOException e) {/ / e is the name of the identifier (ID)
                                System.out.println ("Error!");
                                 }


 note:
                 in the use of a try-catch statement then be without or throws Exception throws IOException

          c. Numerical Data Input

                                public static void main (String [] args) throws IOException {  
                                                System.out.print ("Enter an integer:");
                                                String temp; 
                                                int number = 0;
                                                 InputStreamReader isr = new InputStreamReader (System.in);
                                                BufferedReader br = new BufferedReader (isr);
 
                                                 / / Input data is considered as a string
                                                temp = br.readLine ();
 
                                                try {
                                                                / / Conversion from string to integer
                                                                number = Integer.parseInt (temp);
                                                                } Catch (NumberFormatException NFE) {
                                                                System.out.println ("Input data" +
                                                                "Is not an integer");
                                                                System.exit (1);
                                               }
/ * The above error detection can occur due to eg a computer network is disconnected,
          there is an error in the system hardware, etc. * /

2.using JOptionPane

                public static void main (String [] args)
                {
                String text = JOptionPane.showInputDialog ("Enter Data");
                System.out.print ("The data entered is =" + text);
                System.exit (0);
                }



source: STMIK AMIKOM YOGYAKARTA