自己写的一个replaceAll方法

在J2ME中只提供了public String replace(char oldChar,char newChar)方法，不像J2SE中提供了public String replaceAll(String regex,String replacement)方法。由于项目需要自己写了一个：

public static String replaceAll(String src,String oldStr,String newStr){int oldStrLength = oldStr.length();StringBuffer dest = new StringBuffer();int index = src.indexOf(oldStr);if(index==-1){dest.append(src);}else{dest.append(src.substring(0, index));}while(index!=-1){dest.append(newStr);int beforeIndex = index ;index = src.indexOf(oldStr,index+oldStrLength);if(index==-1){dest.append(src.substring(beforeIndex+oldStrLength));}else{dest.append(src.substring(beforeIndex+oldStrLength,index));}}return dest.toString() ;}