一个简单的递归——逆序输出字符串

public static String getStr(String source){
if(source==null||source.equals("")){
return "";
}
if(source.length()==1){
return source;
}else{
String temp = source.substring(0, source.length()-1);
String value = source.substring(source.length()-1, source.length());
return value + getStr(temp);
}

}