Example usage for java.io FileReader FileReader

Introduction

In this page you can find the example usage for java.io FileReader FileReader.

Prototype

public FileReader(FileDescriptor fd)

Source Link

Document

Creates a new FileReader , given the FileDescriptor to read, using the platform's java.nio.charset.Charset#defaultCharset() default charset .

Usage

From source file:StreamTokenizerDemo.java

public static void main(String args[]) throws Exception {
    FileReader fr = new FileReader(args[0]);
    BufferedReader br = new BufferedReader(fr);
    StreamTokenizer st = new StreamTokenizer(br);
    st.ordinaryChar('.');
    st.wordChars('\'', '\'');

    while (st.nextToken() != StreamTokenizer.TT_EOF) {
        switch (st.ttype) {
        case StreamTokenizer.TT_WORD:
            System.out.println(st.lineno() + ") " + st.sval);
            break;
        case StreamTokenizer.TT_NUMBER:
            System.out.println(st.lineno() + ") " + st.nval);
            break;
        default:/*from   www  . j  av a 2  s.  c om*/
            System.out.println(st.lineno() + ") " + (char) st.ttype);
        }
    }

    fr.close();
}

From source file:MainClass.java

public static void main(String args[]) {

    try {// ww w. j a  v a  2 s  .c om

        FileReader fr = new FileReader(args[0]);

        FileWriter fw = new FileWriter(args[1]);

        int i;
        while ((i = fr.read()) != -1) {
            fw.write(i);
        }
        fw.close();

        fr.close();
    } catch (Exception e) {
        System.out.println("Exception: " + e);
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    FileReader rd = new FileReader("filename.java");
    StreamTokenizer st = new StreamTokenizer(rd);

    st.parseNumbers();//from ww  w  .  ja  v  a2 s .  co  m
    st.wordChars('_', '_');
    st.eolIsSignificant(true);
    st.ordinaryChars(0, ' ');
    st.slashSlashComments(true);
    st.slashStarComments(true);

    int token = st.nextToken();
    while (token != StreamTokenizer.TT_EOF) {
        token = st.nextToken();
        switch (token) {
        case StreamTokenizer.TT_NUMBER:
            double num = st.nval;
            System.out.println(num);
            break;
        case StreamTokenizer.TT_WORD:
            String word = st.sval;
            System.out.println(word);
            break;
        case '"':
            String dquoteVal = st.sval;
            System.out.println(dquoteVal);
            break;
        case '\'':
            String squoteVal = st.sval;
            System.out.println(squoteVal);
            break;
        case StreamTokenizer.TT_EOL:
            break;
        case StreamTokenizer.TT_EOF:
            break;
        default:
            char ch = (char) st.ttype;
            System.out.println(ch);
            break;
        }
    }
    rd.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    String first, last = null, line;
    BufferedReader in = new BufferedReader(new FileReader(args[0]));
    first = in.readLine();/*from www  .j a  va 2 s. c  o m*/
    while ((line = in.readLine()) != null) {
        if (line != null) {
            last = line;
        }
    }
    System.out.println(first + "\n" + last);
    in.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    File file = new File("data.csv");
    FileReader fr = new FileReader(file);
    LineNumberReader lnr = new LineNumberReader(fr);
    // lnr.setLineNumber(400);
    String line = "";
    while ((line = lnr.readLine()) != null) {
        System.out.println("Line Number " + lnr.getLineNumber() + ": " + line);
    }//from w ww  .ja  v  a 2 s .  c  o  m
    fr.close();
    lnr.close();
}

From source file:MainClass.java

public static void main(String args[]) {
    try {//  w ww  . j  a v a 2s  .c o  m
        int counts[] = new int[10];
        FileReader fr = new FileReader(args[0]);

        int i;
        while ((i = fr.read()) != -1) {
            char c = (char) i;
            int k = c - '0';
            if (k >= 0 && k < 10)
                ++counts[k];
        }

        // Display digit counts
        for (int j = 0; j < 10; j++) {
            char c = (char) ('0' + j);
            System.out.print(c + "=");
            System.out.print(counts[j] + "; ");
        }

        fr.close();
    } catch (Exception e) {
        System.out.println("Exception: " + e);
    }
}

From source file:WordCount.java

public static void main(String args[]) throws Exception {
    int words = 0;
    int lines = 0;
    int chars = 0;

    FileReader fr = new FileReader("yourFile.txt");
    int c = 0;/*from  w  w  w.j  av  a  2 s  .  c  o m*/
    boolean lastWhite = true;
    String whiteSpace = " \t\n\r";

    while ((c = fr.read()) != -1) {
        chars++;
        if (c == '\n') {
            lines++;
        }
        int index = whiteSpace.indexOf(c);
        if (index == -1) {
            if (lastWhite == true) {
                ++words;
            }
            lastWhite = false;
        } else {
            lastWhite = true;
        }
    }
    if (chars != 0) {
        ++lines;
    }
}

From source file:Main.java

public static void main(String args[]) {

    try {// w w w.  j  a v  a  2  s. com
        FileReader fr = new FileReader(args[0]);
        BufferedReader br = new BufferedReader(fr);
        StreamTokenizer st = new StreamTokenizer(br);

        st.ordinaryChar('.');

        st.wordChars('\'', '\'');

        while (st.nextToken() != StreamTokenizer.TT_EOL) {
            switch (st.ttype) {
            case StreamTokenizer.TT_WORD:
                System.out.println(st.lineno() + ") " + st.sval);
                break;
            case StreamTokenizer.TT_NUMBER:
                System.out.println(st.lineno() + ") " + st.nval);
                break;
            default:
                System.out.println(st.lineno() + ") " + (char) st.ttype);
            }
        }

        fr.close();
    } catch (Exception e) {
        System.out.println("Exception: " + e);
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    File f = new File("C:\\test.txt");
    FileReader fr = new FileReader(f);
    BufferedReader br = new BufferedReader(fr);

    StringBuffer sb = new StringBuffer();
    String eachLine = br.readLine();

    while (eachLine != null) {
        sb.append(eachLine);/*from ww w. ja  v  a2 s .com*/
        sb.append("\n");
        eachLine = br.readLine();
    }
    System.out.println(sb.toString());
}

From source file:TabFilter.java

public static void main(String args[]) throws Exception {
    FileReader fr = new FileReader(args[0]);
    BufferedReader br = new BufferedReader(fr);

    FileWriter fw = new FileWriter(args[1]);
    BufferedWriter bw = new BufferedWriter(fw);

    // Convert tab to space characters
    String s;// ww  w.j a va  2s .  co m
    while ((s = br.readLine()) != null) {
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (c == '\t')
                c = ' ';
            bw.write(c);
        }
    }

    bw.flush();
    fr.close();
    fw.close();
}