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:Main.java

public static String reverse(String input) {
    StringBuilder output = new StringBuilder();
    for (int i = input.length() - 1; i >= 0; i--) {
        output.append(input.charAt(i));
    }/*from   ww  w  . ja v a 2  s. com*/
    return output.toString();
}

From source file:Main.java

/**
 * Tell whether the string contains a positive or negative number
 * delta, i.e., a number with an obligatory + or - sign.
 *//*from  ww  w  .j av a  2s.  c o  m*/
public static boolean isNumberDelta(String string) {
    String s = string.trim();
    if (s.length() < 2)
        return false;

    return (s.charAt(0) == '+' || s.charAt(0) == '-') && isUnsignedNumber(s.substring(1));
}

From source file:Main.java

protected static String display(byte[] array) {
    char[] val = new char[2 * array.length];
    String hex = "0123456789abcdef";
    for (int i = 0; i < array.length; i++) {
        int b = array[i] & 0xff;
        val[2 * i] = hex.charAt(b >>> 4);
        val[2 * i + 1] = hex.charAt(b & 15);
    }/*from  w w  w  .  j  a  v a  2 s.com*/
    return String.valueOf(val);
}

From source file:Main.java

/**
 * Encode a String for XML output, displaying it to a PrintWriter.
 * The String to be encoded is displayed, except that
 * special characters are converted into entities.
 * @param input a String to convert.//from  w  w  w.  ja v a  2 s  . co m
 * @param out a PrintWriter to which to write the results.
 */
public static void stringEncodeXML(String input, PrintWriter out) {
    for (int i = 0; i < input.length(); i++) {
        char c = input.charAt(i);
        switch (c) {
        case '<':
        case '>':
        case '"':
        case '\'':
        case '&':
        case '\t':
        case '\n':
        case '\r':
            out.print("&#" + (int) c + ";");
            break;
        default:
            out.print(c);
        }
    }
}

From source file:Main.java

/**
 * Check whether the parameter is effective compression IPv6 address.
 *
 * @param input IPV6 address./*  w  ww.  j ava 2s  .c o m*/
 * @return True or false.
 * @see #isIPv6StdAddress(String)
 */
public static boolean isIPv6HexCompressedAddress(final String input) {
    int colonCount = 0;
    for (int i = 0; i < input.length(); i++) {
        if (input.charAt(i) == ':') {
            colonCount++;
        }
    }
    return colonCount <= 7 && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
}

From source file:Main.java

/**
 * Scan to ")", return position following the ")".
 * @param domainsAtt/*  w  ww. ja  v  a 2s .  co  m*/
 * @param p
 * @return position of character following the ")".
 */
private static int parseParens(String domainsAtt, int p) {
    char c = domainsAtt.charAt(p);
    while (p < domainsAtt.length()) {
        switch (c) {
        case ')':
            p++;
            break;
        default:
            p++;
        }
    }
    return p;
}

From source file:Main.java

public static String getter2property(String methodName) {
    if (methodName.startsWith("get") && methodName.length() > 3) {
        return Character.toLowerCase(methodName.charAt(3)) + methodName.substring(4);
    }/*from w w w.ja  v  a2  s .c o m*/
    if (methodName.startsWith("is") && methodName.length() > 2) {
        return Character.toLowerCase(methodName.charAt(2)) + methodName.substring(3);
    }
    return null;
}

From source file:Main.java

private static byte bits2byte(String bString) {
    byte result = 0;
    for (int i = bString.length() - 1, j = 0; i >= 0; i--, j++) {
        result += (Byte.parseByte(bString.charAt(i) + "") * Math.pow(2, j));
    }/*from w ww .  ja v a  2 s. com*/
    return result;
}

From source file:Main.java

public static String string2HexString(String str) {

    StringBuffer hexString = new StringBuffer();
    for (int i = 0; i < str.length(); i++) {
        int ch = (int) str.charAt(i);
        String strHex = Integer.toHexString(ch);
        hexString.append(strHex);/*  w  w  w  .j  a v  a  2 s .c om*/
    }
    return hexString.toString();

}

From source file:Main.java

public static int DEKHash(String str) {
    int hash = str.length();

    for (int i = 0; i < str.length(); i++) {
        hash = ((hash << 5) ^ (hash >> 27)) ^ str.charAt(i);
    }//from   ww  w  .  ja va2s. c om

    return (hash & 0x7FFFFFFF);
}