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:Main.java

public static void main(String[] ap) {
    int val;
    try {/*from   ww  w  .j ava2 s . c om*/
        Scanner sc = new Scanner(System.in); // Requires J2SE 1.5
        val = sc.nextInt();
    } catch (NumberFormatException ex) {
        System.err.println("Not a valid number: " + ex);
        return;
    }
    System.out.println("I read this number: " + val);
}

From source file:Main.java

public static void main(String[] arg) {
    System.out.println("Type something");
    try {//from   www  . j a  va2  s .  c o  m
        System.in.read();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String[] args) {

    try {//from   ww w  . j  a v  a 2s. c  o  m
        while (true) {
            int datum = System.in.read();
            if (datum == -1)
                break;
            System.out.println(datum);
        }
    } catch (IOException ex) {
        System.err.println("Couldn't read from System.in!");
    }
}

From source file:MainClass.java

public static void main(String args[]) {
    Scanner input = new Scanner(System.in);

    int number1;/*w w  w .j a v a 2s.c  o m*/
    int number2;

    System.out.print("Enter first integer: "); // prompt 
    number1 = input.nextInt(); // read first number from user 

    System.out.print("Enter second integer: "); // prompt 
    number2 = input.nextInt(); // read second number from user 

    if (number1 == number2)
        System.out.printf("%d == %d\n", number1, number2);

    if (number1 != number2)
        System.out.printf("%d != %d\n", number1, number2);

    if (number1 < number2)
        System.out.printf("%d < %d\n", number1, number2);

    if (number1 > number2)
        System.out.printf("%d > %d\n", number1, number2);

    if (number1 <= number2)
        System.out.printf("%d <= %d\n", number1, number2);

    if (number1 >= number2)
        System.out.printf("%d >= %d\n", number1, number2);

}

From source file:Main.java

public static void main(String[] args) {
    System.out.println("Enter a string");
    Scanner input = new Scanner(System.in);
    String s1 = input.nextLine();
    s1 = s1.trim();/*ww  w.  j a v  a 2s.c  o m*/
    int howLong = s1.length();

    for (int counter = 0; counter < howLong; counter++) {
        char ch = s1.charAt(counter);
        System.out.print(ch);
    }

}

From source file:MainClass.java

public static void main(String args[]) {
    Scanner conin = new Scanner(System.in);

    int count = 0;
    double sum = 0.0;

    System.out.println("Enter numbers to average.");

    while (conin.hasNext()) {
        if (conin.hasNextDouble()) {
            sum += conin.nextDouble();//from  ww  w .  ja va2s. c o  m
            count++;
        } else {
            String str = conin.next();
            if (str.equals("done"))
                break;
            else {
                System.out.println("Data format error.");
                return;
            }
        }
    }

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

From source file:Main.java

public static void main(String[] args) throws Exception {
    System.setIn(new FileInputStream("file.txt"));

    char ret = (char) System.in.read();

    System.out.println(ret);//from www .jav  a 2s  .  c om
}

From source file:MainClass.java

public static void main(String[] args) {
    try {// w w  w.  j a va 2  s .  c  om
        System.out.println("In second try block in main()");
        System.in.read();
        return;
    } catch (IOException e) {
        System.out.println("I/O exception caught in main()");
    } finally {
        System.out.println("finally block for second try block in main()");
    }
    System.out.println("Code after second try block in main()");
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    InputStream in = System.in;
    BufferedWriter bw = new BufferedWriter(new FileWriter("output.txt"));

    int letter;//from  ww  w  .ja  v a 2 s  .  c o m

    while ((letter = in.read()) != -1) {
        bw.write((char) letter);
        bw.flush();
    }
}

From source file:MainClass.java

public static void main(String[] args) {
    try {//from w  w w. j  ava 2  s  .  c  om
        copy(System.in, System.out);
    } catch (IOException ex) {
        System.err.println(ex);
    }

}