JavaCodeAcc/src/containers/Reverse.java at master · kylez7/JavaCodeAcc · GitHub

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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));

}

JavaCodeAcc/src/containers/Reverse.java at master · kylez7/JavaCodeAcc · GitHub

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