FilesExpand file tree

master

/

Reverse.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

62 lines (51 loc) · 1.23 KB

master

/

Reverse.java

Copy path

Top

File metadata and controls

• Code
• Blame

62 lines (51 loc) · 1.23 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

package containers;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collection;

import java.util.Iterator;

/**

* 利用迭代器实现反转操作

*

* @author liu yuning

*

*

*/

public class Reverse {

@SuppressWarnings("serial")

private static class ReverseCollection<T> extends ArrayList<T> {

public ReverseCollection(Collection<T> collection) {

super(collection);

}

public Iterable<T> reverse() {

return new Iterable<T>() {

@Override

public Iterator<T> iterator() {

return new Iterator<T>() {

int current = size() - 1;

@Override

public boolean hasNext() {

return current > -1;

}

@Override

public T next() {

return get(current--);

}

};

}

};

}

}

public static String reverseWords(String s) {

ReverseCollection<String> reverseCollection = new ReverseCollection<String>(

Arrays.asList(s.split(" ")));

StringBuilder stringBuilder = new StringBuilder();

for (String word : reverseCollection.reverse()) {

stringBuilder.append(word + " ");

}

return stringBuilder.toString().trim();

}

public static void main(String[] args) {

String s = "This is a test for reversing words";

System.out.println(reverseWords(s));

}

}