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ReverseWordsInString.java
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ReverseWordsInString.java
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package algorithm.string.leetcode;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* @author roseduan
* @time 2020/11/9 6:42 下午
* @description 翻转字符串中的单词
*/
public class ReverseWordsInString {
/**
* 借助一个额外的数组存储
*/
public String reverseWords1(String s) {
List<String> list = new ArrayList<>();
String[] words = s.split(" ");
for (String word : words) {
if (word.trim().length() > 0) {
list.add(word);
}
}
StringBuilder sb = new StringBuilder();
for (int i = list.size() - 1; i >= 0; i--) {
sb.append(list.get(i)).append(" ");
}
return sb.substring(0, sb.length() - 1);
}
/**
* 另一种写法
*/
public String reverseWords2(String s) {
String[] words = s.split(" +");
Collections.reverse(Arrays.asList(words));
return String.join(" ", words);
}
}