Example usage for java.lang System in

Introduction

In this page you can find the example usage for java.lang System in.

Prototype

InputStream in

To view the source code for java.lang System in.

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Document

The "standard" input stream.

Usage

From source file:ReadConsole.java

public static void main(String args[]) throws Exception {
    InputStreamReader isr = new InputStreamReader(System.in);

    BufferedReader br = new BufferedReader(isr);

    String s;//from  ww w  .  ja  va 2  s .c  o  m
    while ((s = br.readLine()) != null) {
        System.out.println(s.length());
    }
    isr.close();
}

From source file:MainClass.java

public static void main(String[] args) {
    int inChar;//from w  ww . j  av  a2  s  .c o  m
    System.out.println("Enter a Character:");
    try {
        inChar = System.in.read();
        System.out.print("You entered ");
        System.out.println(inChar);
    } catch (IOException e) {
        System.out.println("Error reading from user");
    }
}

From source file:ReverseConsoleInput.java

public static void main(String args[]) throws Exception {
    InputStreamReader isr = new InputStreamReader(System.in);
    BufferedReader br = new BufferedReader(isr);

    // Read and process lines from console
    String s;// w  w w .  j  a v  a 2 s.  c o  m
    while ((s = br.readLine()) != null) {
        StringBuffer sb = new StringBuffer(s);
        sb.reverse();
        System.out.println(sb);
    }
    isr.close();
}

From source file:Main.java

public static void main(String args[]) throws Exception {
    InputStreamReader isr = new InputStreamReader(System.in);
    BufferedReader br = new BufferedReader(isr);

    while (true) {
        System.out.print("Radius? ");
        String str = br.readLine();
        double radius;
        try {/*from w ww .  j a va  2 s.c  o m*/
            radius = Double.valueOf(str).doubleValue();
        } catch (NumberFormatException nfe) {
            System.out.println("Incorrect format!");
            continue;
        }
        if (radius <= 0) {
            System.out.println("Radius must be positive!");
            continue;
        }
        System.out.println("radius " + radius);
        return;
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    String input = reader.readLine();

    double number = Double.parseDouble(input);

    System.out.println(input + ":" + Math.sqrt(number));

    reader.close();//from  w w  w  .ja  v a 2 s  .c om
}

From source file:Calculator.java

public static void main(String[] args) {
    System.out.println("type something like: 1+3");
    Scanner scanner = new Scanner(System.in);
    double n1 = Double.NaN;
    double n2 = Double.NaN;
    String operation = null;/* w  w w .  ja  va2s. c o m*/

    try {
        n1 = scanner.nextDouble();
        operation = scanner.next();
        n2 = scanner.nextDouble();
        double result = calculate(n1, n2, operation);
        System.out.printf("%s %s  %s  = %.2f%n", n1, operation, n2, result);
    }

    catch (Exception e) {
        System.out.println("An invalid expression.");
    }
}

From source file:EchoStdin.java

public static void main(String[] args) throws IOException {
    System.out.print("Please type   a  message  and  press enter: ");

    int c = '\n';
    while ((c = System.in.read()) != '\n') {
        System.out.print((char) c);
    }/*from w  w  w  .j a  v  a  2s .  co m*/
}

From source file:Test.java

public static void main(String[] args) {
    try {//  w  w w .  j a  v  a2 s . 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:MainClass.java

public static void main(String[] args) throws IOException {
    BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Enter a line:");
    System.out.println(stdin.readLine());
}

From source file:MainClass.java

public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String s;//from w w w  .j a v a2s.  co  m
    while ((s = in.readLine()) != null && s.length() != 0)
        System.out.println(s);
    // An empty line or Ctrl-Z terminates the program
}