Wu Yuxiong - natural born JAVA development of learning: Scanner class

Import java.util.Scanner; 
 
public  class ScannerDemo {
     public  static  void main (String [] args) { 
        Scanner Scan = new new Scanner (the System.in);
         // keyboard data received from 
 
        // the received character string next mode 
        System.out. println ( "next receiving mode:" );
         // determines whether there is an input 
        iF (scan.hasNext ()) { 
            String str1 = scan.next (); 
            System.out.println ( "data input is:" + str1 ); 
        } 
        scan.close (); 
    } 
}

Import java.util.Scanner; 
 
public  class ScannerDemo {
     public  static  void main (String [] args) { 
        Scanner Scan = new new Scanner (the System.in);
         // keyboard data received from 
 
        // the received character string nextLine embodiment 
        System.out. println ( "nextLine reception mode:" );
         // determines whether there is an input 
        iF (scan.hasNextLine ()) { 
            String str2 = scan.nextLine (); 
            System.out.println ( "data input is:" + str2 ); 
        } 
        scan.close (); 
    } 
}

Import java.util.Scanner; 
 
public  class ScannerDemo {
     public  static  void main (String [] args) { 
        Scanner Scan = new new Scanner (the System.in);
         // keyboard data received from 
        int I = 0 ;
         a float F = 0.0f ; 
        of System.out.print ( "enter an integer:" );
         iF (scan.hasNextInt ()) {
             // determines whether the input is an integer of 
            I = scan.nextInt ();
             // receiving integer 
            System.out.println ( "integer data: "+ I); 
        }the else {
             // input error information 
            System.out.println ( "input is not an integer!" ); 
        } 
        of System.out.print ( "Input Decimal:" );
         IF (scan.hasNextFloat ()) {
             // Analyzing input the fractional whether 
            F = scan.nextFloat ();
             // receiving decimal 
            System.out.println ( "fractional data:" + F); 
        } the else {
             // input error information 
            System.out.println ( "do not enter decimal "! ); 
        } 
        scan.close (); 
    } 
}

Import java.util.Scanner; 
 
class ScannerDemo {
     public  static  void main (String [] args) { 
        Scanner Scan = new new Scanner (the System.in); 
 
        Double SUM = 0 ;
         int m = 0 ; 
 
        the while (scan.hasNextDouble ()) {
             Double X = scan.nextDouble (); 
            m = m +. 1 ; 
            SUM = SUM + X; 
        } 
 
        System.out.println (m + "and the number of" + SUM); 
        System.out.println (m + "is the average number of" + (sum / m));
        scan.close();
    }
}