Java String.charAt方法代碼示例

import java.lang.String; //導入方法依賴的package包/類
public static String normalizeSpace(String a) {
	StringBuffer result = new StringBuffer();
	boolean needSpace = false;
	for (int i = 0; i < a.length(); i++) {
		char c = a.charAt(i);
		if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
			needSpace = true;
		else
		{
			if (needSpace && result.length() != 0)
				result.append(' ');
			result.append(c);
			needSpace = false;
		}
	}
	return result.toString();
}
 

import java.lang.String; //導入方法依賴的package包/類
public static List<String> lexSqlScript(String sqlScript) {
	ArrayList<String> sl = new ArrayList<String>();
	boolean inString = false, quoteNext = false;
	StringBuilder b = new StringBuilder(100);

	for (int i = 0; i < sqlScript.length(); i++) {
		char c = sqlScript.charAt(i);

		if (c == ';' && !inString && !quoteNext) {
			sl.add(b.toString());
			b = new StringBuilder(100);
			inString = false;
			quoteNext = false;
			continue;
		}

		if (c == '\'' && !quoteNext) {
			inString = !inString;
		}

		quoteNext = c == '\\' && !quoteNext;

		b.append(c);
	}

	if (b.length() > 0) {
		sl.add(b.toString());
	}

	return sl;
}
 

import java.lang.String; //導入方法依賴的package包/類
public static String castToString(double d)
{
	double dAbs = Math.abs(d);
	DecimalFormatSymbols decfmtsymb = new DecimalFormatSymbols(java.util.Locale.US);	// US locale represents numbers with a . as comma and without any (ten)thousend separators.
	decfmtsymb.setInfinity("INF");
	decfmtsymb.setNaN("NaN");
	DecimalFormat decfmt = new DecimalFormat((dAbs > 1E7 || dAbs < 1E-3) && dAbs > 0.0 ?
			"0.##############E000" : "0.#############", decfmtsymb);
	
	String s = decfmt.format(d);
	// 1.234E567 => 1.234E+567
	int e = s.indexOf("E");
	if (e > 0 && s.charAt(e+1) != '-' )
	s = s.substring(0, e) + "E+" + s.substring(e+1);
	return s;
}
 

import java.lang.String; //導入方法依賴的package包/類
public static String formatFraction(long value, long precision)
{
	String result = "";
	if (value != 0)
	{
		result += '.';
		result += formatNumber(value, precision);
		int i = result.length();
		while (result.charAt(i - 1) == '0')
			i -= 1;
		result = result.substring( 0, i );
	}
	return result;
}
 

import java.lang.String; //導入方法依賴的package包/類
public static String translate(String a, String b, String c) {
	String result = "";
	for (int i = 0 ; i < a.length(); i++) {
		char ai = a.charAt(i);
		int off = b.indexOf(ai);
		if (off != -1 && off < c.length())
			result += c.charAt(off);
		else if (off == -1)
			result += ai;
	}
	return result;
}
 

import java.lang.String; //導入方法依賴的package包/類
/**
 * This method was introduced to fix defect #26964.  For Java 1.0.2
 * on Win NT, the escape sequence \u0020 was not being handled
 * correctly by the Java Properties class when it was the final
 * character of a line.  Instead the trailing blank was dropped
 * and the next line was swallowed as a continuation.  To work
 * around the problem, we introduced our own metasymbol to represent
 * a trailing blank.  Hence:
 *
 * Performs substitution for any metasymbols in the message
 * templates.  So far only %B is needed.  This was introduced
 * to make it more convenient for .properties files to
 * contain message templates with leading or trailing blanks
 * (although %B may actually occur anywhere in a template).
 * Subsequently, checking for '\n' has also been added.  Now,
 * wherever '\n' occurs in a message template, it is replaced
 * with the value of System.getProperty ("line.separator").
 */
private static final void fixMessages (Properties p) {

    Enumeration keys = p.keys ();
    Enumeration elems = p.elements ();
    while (keys.hasMoreElements ()) {
        String key = (String) keys.nextElement ();
        String elem = (String) elems.nextElement ();
        int i = elem.indexOf (LTB);
        boolean changed = false;
        while (i != -1) {
            if (i == 0)
                elem = " " + elem.substring (2);
            else
                elem = elem.substring (0, i) + " " + elem.substring (i+2);
            changed = true;
            i = elem.indexOf (LTB);
        }
        int lsIncr = lineSeparator.length () - 1;
        for (i=0; i<elem.length (); i++) {
            if (elem.charAt (i) == NL) {
                elem = elem.substring (0, i) +
                    lineSeparator + elem.substring (i+1);
                i += lsIncr;
                changed = true;
            }
        }
        if (changed)
            p.put (key, elem);
    }

}