Example usage for java.util Scanner Scanner

Introduction

In this page you can find the example usage for java.util Scanner Scanner.

Prototype

public Scanner(ReadableByteChannel source)

Source Link

Document

Constructs a new Scanner that produces values scanned from the specified channel.

Usage

From source file:Test.java

public static void main(String[] args) {
    try {/*www . j av a 2s.c  om*/
        System.out.print("Enter a number: ");
        int number = new Scanner(System.in).nextInt();
        if (number < 0) {
            throw new InvalidParameter();
        }
        System.out.println("The number is: " + number);
    } catch (InputMismatchException | InvalidParameter e) {
        System.out.println("Invalid input, try again");
    }
}

From source file:Main.java

public static void main(String[] args) {

    String s = "java2s.com 1 + 1 = 2.0 true ";
    Long l = 123456789098765432L;
    s = s + l;/*from w w w .j a  v  a 2  s  .  c  o m*/

    Scanner scanner = new Scanner(s);

    while (scanner.hasNext()) {

        System.out.println("Not Found :" + scanner.next());

        if (scanner.hasNextLong()) {
            System.out.println("Found :" + scanner.nextLong());
        }
    }
    scanner.close();
}

From source file:Main.java

public static void main(String[] args) {

    String s = "java2s.com ";
    Long l = 1234567890987654L;/*from w w  w .  j av a  2  s  .  com*/
    s = s + l;

    Scanner scanner = new Scanner(s);

    // use US locale in order to be able to identify long in a string
    scanner.useLocale(Locale.US);

    while (scanner.hasNext()) {
        // check if the scanner's next token is along
        System.out.println(scanner.hasNextLong());

        System.out.println(scanner.next());
    }
    scanner.close();
}

From source file:Main.java

public static void main(String[] args) {

    String s = "java2s.com ";
    Long l = 1234567890987654L;// w w w.  jav a 2s . c  om
    s = s + l;

    Scanner scanner = new Scanner(s);

    // use US locale in order to be able to identify long in a string
    scanner.useLocale(Locale.US);

    while (scanner.hasNext()) {
        // check if the scanner's next token is a long with radix 4
        System.out.println(scanner.hasNextLong(4));

        System.out.println(scanner.next());
    }
    scanner.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {

    URLConnection connection = new URL("http://java.net").openConnection();
    String text = new Scanner(connection.getInputStream()).useDelimiter("\\Z").next();

}

From source file:Main.java

public static void main(String[] args) {

    String s = "java2s.com 1 + 1 = 2.0 true ";
    Float f = 1.2385f;/*from  w  ww . j av  a  2s  .co m*/
    s = s + f;

    Scanner scanner = new Scanner(s);

    scanner.useLocale(Locale.US);

    while (scanner.hasNext()) {
        scanner.next();
        if (scanner.hasNextFloat()) {
            System.out.println("Found :" + scanner.nextFloat());
        }
    }

    scanner.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {

    Console cnsl = System.console();

    if (cnsl != null) {
        System.out.print("Enter name : ");
        Scanner scan = new Scanner(cnsl.reader());
        while (scan.hasNext()) {
            String str = scan.next();
            System.out.println(str);
        }//  w  w  w  .j a v  a  2 s . c o m
    }
}

From source file:Main.java

public static void main(String[] args) {
    String str = "java2s.com";
    ByteArrayInputStream bais = new ByteArrayInputStream(str.getBytes());
    System.setIn(bais);//w  ww.  j a va2  s.com

    Scanner scanner = new Scanner(System.in);
    String input = scanner.next();
    System.out.println(input);
}

From source file:Main.java

public static void main(String args[]) throws IOException {

    int count = 0;
    double sum = 0.0;

    FileWriter fout = new FileWriter("test.txt");

    fout.write("2, 3.4,    5,6, 7.4, 9.1, 10.5, done");
    fout.close();//from  w  ww . j a v a 2s.c o  m

    FileReader fin = new FileReader("Test.txt");

    Scanner src = new Scanner(fin);

    src.useDelimiter(", *");

    while (src.hasNext()) {
        if (src.hasNextDouble()) {
            sum += src.nextDouble();
            count++;
        } else {
            String str = src.next();
            if (str.equals("done"))
                break;
            else {
                System.out.println("File format error.");
                return;
            }
        }
    }

    fin.close();
    System.out.println("Average is " + sum / count);
}

From source file:MainClass.java

public static void main(String args[]) throws IOException {

    FileWriter fout = new FileWriter("test.txt");
    fout.write("2, 3.4,    5,6, 7.4, 9.1, 10.5, done");
    fout.close();/*from   w  ww. j  av  a 2 s.c  o m*/

    FileReader fin = new FileReader("Test.txt");
    Scanner src = new Scanner(fin);
    // Set delimiters to space and comma.
    // ", *" tells Scanner to match a comma and zero or more spaces as
    // delimiters.

    src.useDelimiter(", *");

    // Read and sum numbers.
    while (src.hasNext()) {
        if (src.hasNextDouble()) {
            System.out.println(src.nextDouble());
        } else {
            break;
        }
    }
    fin.close();
}