JAVA 1.3 中实现replaceAll 方法

JAVA 1.3中没有replaceAll方法，但有时会用到：

以下方法实现：

while(value.indexOf("  ")!=-1){
	value = replaceAll(value, "  ", " ", false);
}

方法：

public static boolean isEmpty(String messages){
		if(messages != null)
			return false;
		return true;
	}
	
	public static String replaceAll(
			String source, 
			String find, 
			String replace,
			boolean bIgnoreCase)throws IllegalArgumentException {
		
		if (isEmpty(source)) {
			throw new IllegalArgumentException("Empty   source   String");
		} else if (isEmpty(find)) {
			return (source);
		}
		if (replace == null) {
			replace = "";
		}
		StringBuffer sb = new StringBuffer(source);
		StringBuffer mod;
		boolean bDone = false;
		int prevIndex = 0, currIndex = 0, i = 0;
		if (bIgnoreCase) {
			source = source.toLowerCase();
			find = find.toLowerCase();
		}
		mod = new StringBuffer(source);
		while (!bDone) {
			if ((currIndex = mod.toString().indexOf(find, prevIndex)) != -1) {
				sb = sb.replace(currIndex, currIndex + find.length(), replace);
				mod = mod.replace(currIndex, currIndex + find.length(), replace);
				prevIndex = currIndex + replace.length();
			} else {
				bDone = true;
			}
		}
		return (sb.toString());
	}