Example usage for java.util Scanner hasNextInt

Introduction

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

Prototype

public boolean hasNextInt() 

Source Link

Document

Returns true if the next token in this scanner's input can be interpreted as an int value in the default radix using the #nextInt method.

Usage

From source file:Main.java

public static void main(String[] args) {

    String s = "java2s.com 1 + 1 = 2.0 true ";

    Scanner scanner = new Scanner(s);

    while (scanner.hasNext()) {

        if (scanner.hasNextInt()) {
            System.out.println("Found :" + scanner.nextInt());
        }/*w w w  .  j av a2  s.c  o  m*/
        System.out.println("Not Found :" + scanner.next());
    }

    scanner.close();
}

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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 w w  w  . j av  a  2 s .com

    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();
}

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From source file:ScanMixed.java

public static void main(String args[]) throws IOException {
    int i;//from w w  w  . j a va 2  s .  com
    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();
}

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From source file:MainClass.java

public static void main(String args[]) throws IOException {
    int i;//from  ww w  .ja v  a  2s  . co  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();
}

---

From source file:MainClass.java

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

    int i;//  w ww. j  a v  a2s  . c o  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:Main.java

public static void main(String[] args) {

    String s = "java2s.com 1 + 1 = 2.0 ";

    Scanner scanner = new Scanner(s);

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

        System.out.println(scanner.next());
    }// w  w  w . j av  a  2s  . c om
    scanner.close();
}

---

From source file:Main.java

public static void main(String[] args) {

    String s = "java2s.com 1 + 1 = 2.0 true ";

    Scanner scanner = new Scanner(s);

    while (scanner.hasNext()) {

        // if the next is a int, print found and the int with radix 4
        if (scanner.hasNextInt()) {
            System.out.println("Found :" + scanner.nextInt(4));
        }//from   w w w .j  a  v a 2s  .c o  m
        System.out.println("Not Found :" + scanner.next());
    }

    scanner.close();
}

---

From source file:Main.java

public static int[] readNumsFromCommandLine() {
    Scanner s = new Scanner(System.in);
    int count = s.nextInt();
    s.nextLine(); // throw away the newline.
    int[] numbers = new int[count];
    Scanner numScanner = new Scanner(s.nextLine());
    for (int i = 0; i < count; i++) {
        if (numScanner.hasNextInt()) {
            numbers[i] = numScanner.nextInt();
        } else {//from w  ww.  j  av a  2 s  .c om
            System.out.println("You didn't provide enough numbers");
            break;
        }
    }
    return numbers;
}

---

From source file:Main.java

/**
 * Remove indexes from an xpath string.//  w ww.j a v  a2 s  .co m
 * @param xpath xpath string
 * @return unindexed xpath string
 */
public static String removeIndexes(String xpath) {
    final String[] partialSteps = xpath.split("[/]");
    if (partialSteps.length == 0) {
        return xpath;
    }

    int startIndex = 0;
    StringBuffer buf = new StringBuffer();

    for (int i = startIndex; i < partialSteps.length; i++) {
        String step = partialSteps[i];
        int start = step.indexOf('[');

        if (start > -1) {
            int end = step.indexOf(']');
            Scanner scanner = new Scanner(step.substring(start + 1, end));
            if (scanner.hasNextInt()) {
                // remove index and the brackets
                step = step.substring(0, start);
            }
        }
        buf.append(step);
        if (i < partialSteps.length - 1) {
            buf.append("/");
        }
    }
    return buf.toString();
}

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From source file:Main.java

private static int getChoice() {

    Scanner input = new Scanner(System.in);
    int choice = 1; //default value to force skip of first if statement check
    do {//from ww w . j a v  a2 s. c  o  m
        if (choice < 1 | choice > 4)
            System.out.println("Invalid choice...");
        System.out.print("Choice: ");
        /*This while loop checks the buffer stream for the next incoming input.
         *the purpose is to check if the input can be assigned an int value.
         *at this time choice has not be assigned*/
        while (!input.hasNextInt()) { // ask for an input, if input NOT nextInt then:
            input.next(); // consumes the token and returns to top of loop for another token
            System.out.print("Try again: "); //don't want println as that would shift cursor to new line
        }
        choice = input.nextInt(); //once the input has been found to be an int, assign to choice
        /*now choice needs to be checked for the correct range of values.
         * if its not within 1-4 then repeat while loop above*/
    } while (choice < 1 | choice > 4);
    //input.close();
    return choice;
}

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