Example usage for java.lang String charAt

Introduction

In this page you can find the example usage for java.lang String charAt.

Prototype

public char charAt(int index)

Source Link

Document

Returns the char value at the specified index.

Usage

From source file:MainClass.java

License:asdf

public static void main(String[] argv) throws Exception {
    CharBuffer buffer = CharBuffer.allocate(100);

    String string = "asdf";

    for (int i = 0; i < string.length(); i++) {
        buffer.put(string.charAt(i));
    }//from ww  w.j a  v  a 2 s  . c  om

    buffer.flip();
    drainBuffer(buffer);
    buffer.clear();
}

From source file:Main.java

public static void main(String args[]) throws IOException {
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.size());
    ByteArrayInputStream inStream = new ByteArrayInputStream(outStream.toByteArray());
    int inBytes = inStream.available();
    System.out.println("inStream has " + inBytes + " available bytes");
    byte inBuf[] = new byte[inBytes];
    int bytesRead = inStream.read(inBuf, 0, inBytes);
    System.out.println(bytesRead + " bytes were read");
    System.out.println("They are: " + new String(inBuf));
}

From source file:Main.java

public static void main(String[] args) {
    String numbers = "1234567890";
    for (int i = 0; i < numbers.length(); i++) {
        if (Character.isDigit(numbers.charAt(i))) {
            System.out.println(numbers.charAt(i) + " is a number.");
        } else {//from  w w w. ja va2  s .  c om
            System.out.println(numbers.charAt(i) + " not a number.");
        }
    }
}

From source file:ByteArrayIOApp.java

public static void main(String args[]) throws IOException {
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.size());
    ByteArrayInputStream inStream;
    inStream = new ByteArrayInputStream(outStream.toByteArray());
    int inBytes = inStream.available();
    System.out.println("inStream has " + inBytes + " available bytes");
    byte inBuf[] = new byte[inBytes];
    int bytesRead = inStream.read(inBuf, 0, inBytes);
    System.out.println(bytesRead + " bytes were read");
    System.out.println("They are: " + new String(inBuf));
}

From source file:Main.java

public static void main(String args[]) throws IOException {
    StringWriter outStream = new StringWriter();
    String s = "This is a test from j a va2s.com.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.toString().length());
}

From source file:StringIOApp.java

public static void main(String args[]) throws IOException {
    StringWriter outStream = new StringWriter();
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.toString().length());
    StringReader inStream;//from  ww  w.j  av  a  2  s.  com
    inStream = new StringReader(outStream.toString());
    int ch = 0;
    StringBuffer sb = new StringBuffer("");
    while ((ch = inStream.read()) != -1)
        sb.append((char) ch);
    s = sb.toString();
    System.out.println(s.length() + " characters were read");
    System.out.println("They are: " + s);
}

From source file:Main.java

public static void main(String args[]) throws IOException {
    CharArrayWriter outStream = new CharArrayWriter();
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.size());
    CharArrayReader inStream;/* ww  w .  j av  a  2s  .  co  m*/
    inStream = new CharArrayReader(outStream.toCharArray());
    int ch = 0;
    StringBuffer sb = new StringBuffer("");
    while ((ch = inStream.read()) != -1)
        sb.append((char) ch);
    s = sb.toString();
    System.out.println(s.length() + " characters were read");
    System.out.println("They are: " + s);
}

From source file:Main.java

public static void main(String[] args) {
    Map<Character, Integer> map = new TreeMap<>();

    String blah = "aaaabbbbddd";

    for (int i = 0; i < blah.length(); i++) {
        char c = blah.charAt(i);
        if (!map.containsKey(c)) {
            map.put(c, 1);/*from ww w  .j  a v a2 s .co m*/
        } else {
            map.put(c, (map.get(c) + 1));
        }
    }

    for (Map.Entry<Character, Integer> entry : map.entrySet()) {
        System.out.print(entry.getKey() + "" + entry.getValue());
    }
}

From source file:FileIOApp.java

public static void main(String args[]) throws IOException {
    FileOutputStream outStream = new FileOutputStream("test.txt");
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));
    outStream.close();//from www.j a v a2  s  .  c o  m
    FileInputStream inStream = new FileInputStream("test.txt");
    int inBytes = inStream.available();
    System.out.println("inStream has " + inBytes + " available bytes");
    byte inBuf[] = new byte[inBytes];
    int bytesRead = inStream.read(inBuf, 0, inBytes);
    System.out.println(bytesRead + " bytes were read");
    System.out.println("They are: " + new String(inBuf));
    inStream.close();
    File f = new File("test.txt");
    f.delete();
}

From source file:Main.java

public static void main(String args[]) throws IOException {
    StringWriter outStream = new StringWriter(100);
    String s = "This is a test from j a va2s.com.";
    for (int i = 0; i < s.length(); ++i) {
        outStream.write(s.charAt(i));
    }//  w  ww .jav  a  2  s .co m
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.toString().length());
}