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:MainClass.java

public static void main(String args[]) {
    try {//w ww  .  j  a  v a 2s  .  c om

        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);

        while (true) {

            System.out.print("Radius? ");

            String str = br.readLine();
            double radius;
            try {
                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;
            }

            double area = Math.PI * radius * radius;
            System.out.println("Area is " + area);
            return;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String strLine = in.readLine();
    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
    out.write(strLine, 0, strLine.length());
    out.flush();/*from  ww w. j  a v a2  s.c  o m*/
    in.close();
    out.close();
}

From source file:Main.java

public static void main(String args[]) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String tmp = br.readLine();/*from   w  w  w  .ja v a2  s .c o m*/
    int length = tmp.length();
    char c[] = new char[length];
    tmp.getChars(0, length, c, 0);
    CharArrayReader input1 = new CharArrayReader(c);
    int i;
    System.out.print("input1 is:");
    while ((i = input1.read()) != -1) {
        System.out.print((char) i);
    }

}

From source file:Main.java

public static void main(String args[]) throws IOException {
    String data, answer = "";
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("Enter any String : ");
    data = br.readLine();//from  w w w  .  java 2s. c o  m
    char[] findupper = data.toCharArray();
    for (int i = 0; i < findupper.length; i++) {
        if (findupper[i] >= 65 && findupper[i] <= 91) // ascii value in between 65
                                                      // and 91 is A to Z
        {
            answer += findupper[i]; // adding only uppercase
        }
    }
    System.out.println("Answer : " + answer);
}

From source file:Main.java

public static void main(String[] ap) {
    String line = null;//from w  w w.  j ava2s  . c o  m
    int val = 0;
    try {
        BufferedReader is = new BufferedReader(new InputStreamReader(System.in));
        line = is.readLine();
        val = Integer.parseInt(line);
    } catch (NumberFormatException ex) {
        System.err.println("Not a valid number: " + line);
    } catch (IOException e) {
        System.err.println("Unexpected IO ERROR: " + e);
    }
    System.out.println("I read this number: " + val);
}

From source file:Main.java

public static void main(String[] args) {
    String str = "java2s.com";
    ByteArrayInputStream bais = new ByteArrayInputStream(str.getBytes());
    System.setIn(bais);/*  ww  w. ja  v  a2 s . c  om*/

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

From source file:MainClass.java

public static void main(String args[]) {
    try {//w w w .  j  a v a 2 s  .c o  m
        System.out.print("Enter your name: ");
        InputStreamReader reader = new InputStreamReader(System.in);
        BufferedReader in = new BufferedReader(reader);

        String name = in.readLine();
        System.out.println("Hello, " + name + ". Enter three ints...");
        int[] values = new int[3];
        double sum = 0.0;

        for (int i = 0; i < values.length; i++) {
            System.out.print("Number " + (i + 1) + ": ");
            String temp = in.readLine();
            values[i] = Integer.parseInt(temp);
            sum += values[i];
        }

        System.out.println("The average equals " + sum / values.length);

    } catch (IOException e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String args[]) throws IOException {
    BufferedReader inData = new BufferedReader(new InputStreamReader(System.in));
    StreamTokenizer inStream = new StreamTokenizer(inData);
    inStream.commentChar('#');
    boolean eof = false;
    do {//www. j a  v  a2s.c  om
        int token = inStream.nextToken();
        switch (token) {
        case StreamTokenizer.TT_EOF:
            System.out.println("EOF encountered.");
            eof = true;
            break;
        case StreamTokenizer.TT_EOL:
            System.out.println("EOL encountered.");
            break;
        case StreamTokenizer.TT_WORD:
            System.out.println("Word: " + inStream.sval);
            break;
        case StreamTokenizer.TT_NUMBER:
            System.out.println("Number: " + inStream.nval);
            break;
        default:
            System.out.println((char) token + " encountered.");
            if (token == '!')
                eof = true;
        }
    } while (!eof);
}

From source file:Main.java

public static void main(String[] av) throws IOException {
    StreamTokenizer tf = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
    int i;//  w w w  .jav a 2s  .com

    while ((i = tf.nextToken()) != StreamTokenizer.TT_EOF) {
        switch (i) {
        case StreamTokenizer.TT_EOF:
            System.out.println("End of file");
            break;
        case StreamTokenizer.TT_EOL:
            System.out.println("End of line");
            break;
        case StreamTokenizer.TT_NUMBER:
            System.out.println("Number " + tf.nval);
            break;
        case StreamTokenizer.TT_WORD:
            System.out.println("Word, length " + tf.sval.length() + "->" + tf.sval);
            break;
        default:
            System.out.println("What is it? i = " + i);
        }
    }

}

From source file:StreamTokenApp.java

public static void main(String args[]) throws IOException {
    BufferedReader inData = new BufferedReader(new InputStreamReader(System.in));
    StreamTokenizer inStream = new StreamTokenizer(inData);
    inStream.commentChar('#');
    boolean eof = false;
    do {/*from w  w  w .  j a  v a  2 s .  co m*/
        int token = inStream.nextToken();
        switch (token) {
        case inStream.TT_EOF:
            System.out.println("EOF encountered.");
            eof = true;
            break;
        case inStream.TT_EOL:
            System.out.println("EOL encountered.");
            break;
        case inStream.TT_WORD:
            System.out.println("Word: " + inStream.sval);
            break;
        case inStream.TT_NUMBER:
            System.out.println("Number: " + inStream.nval);
            break;
        default:
            System.out.println((char) token + " encountered.");
            if (token == '!')
                eof = true;
        }
    } while (!eof);
}