Java数组、List的转化合并

昨天偶换了一个小方法来实现Java数组、List的转化、合并，并在新数组的第一位置入自己想要或已定的数据变量/对象，

代码如下：

    //preCondition    List list1 = new ArrayList();    List list2 = new ArrayList();    list1.add("test1");    list1.add("test2");    list2.add(1);    list2.add(2);    String temp = "TEMP";

    //first:get arrays from list    Object[] array1 = list1.toArray();    Object[] array2 = list2.toArray();        //second:get new array that length is list1.size+list2.size     Object[] obj = Arrays.copyOf(array1, list1.size()+list2.size()+1);    for (int j=0; j<=array1.length; j++)      obj[j] = j==0?temp:array1[j-1];//add temp into obj[0]        //third:add array2's data into obj[]    for(int i=0; i<array2.length; i++)      obj[obj.length-i-1] = array2[array2.length-i-1];