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:MainClass.java

public static void main(String args[]) throws IOException {
    // Write output to a file.
    FileWriter fout = new FileWriter("test.txt");
    fout.write("2 3.4 5 6 7.4 9.1 10.5 done");
    fout.close();//from   ww  w .  j  a va  2 s .c  o  m

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

    Scanner src = new Scanner(fin);

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

From source file:MainClass.java

public static void main(String args[]) throws IOException {
    // Write output to a file.
    FileWriter fout = new FileWriter("test.txt");
    fout.write("int: 1  double 1.0  boolean true");
    fout.close();//from www.j a  v a2s . co m

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

    Scanner src = new Scanner(fin);

    while (src.hasNext()) {
        if (src.hasNextInt()) {
            System.out.println("int: " + src.nextInt());
        } else if (src.hasNextDouble()) {
            System.out.println("double: " + src.nextDouble());
        } else if (src.hasNextBoolean()) {
            System.out.println("boolean: " + src.nextBoolean());
        } else {
            System.out.println(src.next());
        }
    }
    fin.close();
}

From source file:MainClass.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   ww w.j a va2s .  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:ScanMixed.java

public static void main(String args[]) throws IOException {
    int i;/* w  w  w . java 2  s .  co  m*/
    double d;
    boolean b;
    String str;

    FileWriter fout = new FileWriter("test.txt");
    fout.write("Testing Scanner 10 12.2 one true two false");
    fout.close();

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

    Scanner src = new Scanner(fin);

    while (src.hasNext()) {
        if (src.hasNextInt()) {
            i = src.nextInt();
            System.out.println("int: " + i);
        } else if (src.hasNextDouble()) {
            d = src.nextDouble();
            System.out.println("double: " + d);
        } else if (src.hasNextBoolean()) {
            b = src.nextBoolean();
            System.out.println("boolean: " + b);
        } else {
            str = src.next();
            System.out.println("String: " + str);
        }
    }

    fin.close();
}

From source file:MainClass.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  ww  w.j av a2 s.co  m*/

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

    Scanner src = new Scanner(fin);

    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:LogTest.java

public static void main(String[] args) throws IOException {
    String inputfile = args[0];/*from   ww w .j  a v a 2s.  co m*/
    String outputfile = args[1];

    Map<String, Integer> map = new TreeMap<String, Integer>();

    Scanner scanner = new Scanner(new File(inputfile));
    while (scanner.hasNext()) {
        String word = scanner.next();
        Integer count = map.get(word);
        count = (count == null ? 1 : count + 1);
        map.put(word, count);
    }
    scanner.close();

    List<String> keys = new ArrayList<String>(map.keySet());
    Collections.sort(keys);

    PrintWriter out = new PrintWriter(new FileWriter(outputfile));
    for (String key : keys)
        out.println(key + " : " + map.get(key));
    out.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Scanner scanner = new Scanner(new File("fileName"));
    scanner.useDelimiter(System.getProperty("line.separator"));
    while (scanner.hasNext()) {
        parseLine(scanner.next());/*  www  .  j a  va 2  s.  co  m*/
    }
    scanner.close();
}

From source file:com.skynetcomputing.skynettools.Main.java

/**
 * @param args the command line arguments
 *///w ww.  j  a  va 2 s.com
public static void main(String[] args) throws IOException {
    Scanner s = new Scanner(System.in);
    boolean isRunning = true;
    while (isRunning) {
        System.out.println("Enter file path for MD5 hash. Leave empty to quit");
        String input = s.nextLine();
        isRunning = !input.isEmpty();
        if (isRunning) {
            File inputFile = new File(input);
            if (inputFile.length() > 0) {
                try (FileInputStream fis = new FileInputStream(inputFile)) {
                    String md5 = org.apache.commons.codec.digest.DigestUtils.md5Hex(fis);
                    System.out.println("MD5: " + md5);
                }
            }
        }
    }

}

From source file:Matrix_Operations.java

public static void main(String[] args) {

    Scanner keyboard = new Scanner(System.in);

    //Allow user to enter number of columns
    int rows = getRowsNumberFromUser();
    int columns = getColumnNumberFromUser();
    double matrixA[][] = new double[rows][columns];

    //Enter values for matrix
    System.out.println("Enter values for each position in the matrix below. ");
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < columns; j++) {
            matrixA[i][j] = keyboard.nextDouble();

        }/*from  ww w  .j  a v a2  s  .c om*/
        System.out.println("");
    }

    showMatrix(matrixA);
    System.out.println("");
    RealMatrix A = MatrixUtils.createRealMatrix(matrixA);

    LUDecomposition lu = new LUDecomposition(A);

    showMatrix(matrixA);

    System.out.println(lu.getDeterminant());

}

From source file:MainClass.java

public static void main(String args[]) throws IOException {
    int i;//w w  w .  j  av  a2s.c  o m
    double d;
    boolean b;
    String str;

    FileWriter fout = new FileWriter("test.txt");
    fout.write("string true false 1 2 3 4.12");
    fout.close();

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

    Scanner src = new Scanner(fin);

    while (src.hasNext()) {
        if (src.hasNextInt()) {
            i = src.nextInt();
            System.out.println("int: " + i);
        } else if (src.hasNextDouble()) {
            d = src.nextDouble();
            System.out.println("double: " + d);
        } else if (src.hasNextBoolean()) {
            b = src.nextBoolean();
            System.out.println("boolean: " + b);
        } else {
            str = src.next();
            System.out.println("String: " + str);
        }
    }

    fin.close();
}