java 字符串按单词倒序输出

String str = "hi,hello world !";

//分割符
char[] splits = ", ".toCharArray();
Set splitCharSet = new HashSet();
for(char split:splits){
    splitCharSet.add(split);
}[code="java"]

StringBuilder reverseStr = new StringBuilder();
StringBuilder rsIndex = new StringBuilder();
Character indexChar;
for(int i=str.length()-1;i>-1;i--){
indexChar = Character.valueOf(str.charAt(i));
if(!splitCharSet.contains(indexChar)){
rsIndex.append(indexChar);
}else{
reverseStr.append(rsIndex.reverse()).append(indexChar);
rsIndex.delete(0, rsIndex.length());
}
}
reverseStr.append(rsIndex.reverse());
System.out.println(reverseStr);[/code]