commons-collections-3.2.1数组处理工具包

该jar包封装了很多关于数组的操作，非常方便。西面给出几个示例，其他大家可以自己摸索。
包括:MapUtils,SetUtils
JDK自带的Arrays,Collections,System.arraycopy
都非常好用

package test.ArrayToList;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.collections.CollectionUtils;

public class Test {

    public static void main(String[] args) {
        List<Integer> list = new ArrayList<Integer>();
        String[] myString = new String[] { "1", "2", "hello array!" };
        CollectionUtils.addAll(list, myString);
        System.out.println(list.get(0));
        System.out.println(list.get(1));
        System.out.println(list.get(2));
    }

}

package test.collectionsUtils;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.collections.CollectionUtils;

public class Test {

    public static void main(String[] args) {
        List<Object> list = new ArrayList<Object>();
        List<Object> list2 = null;
        System.out.println("isEmpty=" + CollectionUtils.isEmpty(list));
        System.out.println("isNotEmpty=" + CollectionUtils.isNotEmpty(list));
        System.out.println("isEmpty=" + CollectionUtils.isEmpty(list2));
        list.add(1);
        System.out.println("isEmpty=" + CollectionUtils.isEmpty(list));
    }
}