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Reverse Words in a String

2014-07-01 23:31 375 查看
3rd time begin!!

Given an input string, reverse the string word by word.

For example,

Given s = "
the sky is blue
",

return "
blue is sky the
".

click to show clarification.

Clarification:

What constitutes a word?

A sequence of non-space characters constitutes a word.
Could the input string contain leading or trailing spaces?

Yes. However, your reversed string should not contain leading or trailing spaces.
How about multiple spaces between two words?

Reduce them to a single space in the reversed string.

By using string.split

***Notes:StringBuilder-->This class provides an API compatible with 
StringBuffer
, but with no guarantee of synchronization

public String reverseWords(String s) {
s = s.trim();
String[] st = s.split(" ");
StringBuilder sb = new StringBuilder();

for(int i = st.length -1; i>=0;i--){
String tmp = st[i];
if(tmp.length()>=1 && tmp.charAt(0) != ' '){
sb.append(tmp);
sb.append(" ");
}
}

return sb.toString().trim();
}
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