编写程序，颠倒句子中单词的顺序： Enter a sentence: why free software is m

编写程序，颠倒句子中单词的顺序： Enter a sentence: why free software is m

这不是都有提示了么...
char[] charStr = "Enter a sentence: why free software is more important now than ever before?
Reversal of sentence: before ever than now important more is software free why?".toCharArray();
List strList = new ArrayList();
String one= "";//保存每一个单词
for(int i =0;i if(charStr[i] == ',' ||charStr[i] == '.'||charStr[i] == '?'||charStr[i] == '!'){
list.add(one)

one = "";
} else{
one +=charStr[i];

}
}
String all = "";
for(int i =strList.size()-1;i>=0;i--){
all += strList.get(i);//倒着取list里的值
}
System.out.println(all);

不按提示来，简单点是(str就是字符串)：
byte[] b = str.getBytes();

for(int i =0;i byte b1 = b[i];

b[i]=b[b.length-1-i];

b[b.length-1-i] = bi;
}
System.out.println(new String(b));