java复制list，javalist,package cn.o

java复制list，javalist,package cn.o

package cn.outofmemory.snippets.core;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class SafeListCopy extends Object {    public static void output(String[] word) {        System.out.println("characters=" + word.length);        for (int i = 0; i < word.length; i++) {            System.out.println("word[" + i + "]=" + word[i]);        }    }    public static void main(String[] args) {        List wordList = Collections.synchronizedList(new ArrayList());        wordList.add("OutOfMemory.CN");        wordList.add("is");        wordList.add("cool!");        String[] aword = (String[]) wordList.toArray(new String[0]);        output(aword);        String[] bword;        synchronized (wordList) {            int size = wordList.size();            bword = new String[size];            wordList.toArray(bword);        }        output(bword);        String[] cword;        synchronized (wordList) {            cword = (String[]) wordList.toArray(new String[wordList.size()]);        }        output(cword);    }}

输出：

characters=3word[0]=OutOfMemory.CNword[1]=isword[2]=cool!characters=3word[0]=OutOfMemory.CNword[1]=isword[2]=cool!characters=3word[0]=OutOfMemory.CNword[1]=isword[2]=cool!