Question: What is the output of the following program?
1 class Tool<T> {
2 public String name;
3 }
4 public class ToolBox<U> {
5 public static <T> Tool<T> solve(T t) {
6 Tool<T> u = new Tool<T>();
7 return u;
8 }
9 public static <T> T desc(T t) {
10 return t;
11 }
12 public static U idle(U u){return u;}
13
14 public static void main(String...args) {
15 System.out.print(ToolBox.desc("hammer"));
16 System.out.print(ToolBox.solve("hammer").name);
17 System.out.print(ToolBox.<Integer>solve(10).name);
18 System.out.println(idle("xxx"));
19 }
20 }
Choice:
A. compiler error at line 1
B. compiler error at line 4
C. compiler error at line 6
D. compiler error at line 10
E. compiler error at other lines
F. hammerhammer10xxx
G. nullnllnullxxx
H. hammernullnullxxx
