Java如何向数组里添加元素

1.已有的数组datecolumn和list集合

String[] datecolumn = {"Mon", "Tue", "Wed"};
List<String> list = new ArrayList<>();
list.add("Thu");
list.add("Fri");
list.add("Sat");
list.add("Sun");

2.数组和集合add到titleList中

List<String> titleList = new ArrayList<String>();
//将datecolum数组转换list并add到titleList中
titleList.addAll(Arrays.asList(datecolumn));
//将list添加到titleList中
titleList.addAll(list);

3.titleList集合转换title数组

String[] title = titleList.toArray(new String[titleList.size()]);

4.遍历title数组

for (String string : title) {
	System.out.println(string);
}