文章目录
- 下面java代码的执行结果是?()
class A {
public static void main(String[] args) {
Map<String, String> map = new HashMap<String, String>();
map.put("a", "1");
map.put("a", "2");
map.put("b", "3");
map.put("c", "3");
map.put("d", null)<
class A {
public static void main(String[] args) {
Map<String, String> map = new HashMap<String, String>();
map.put("a", "1");
map.put("a", "2");
map.put("b", "3");
map.put("c", "3");
map.put("d", null)<