View Compilation Error

0_0_8161179_6923\Main.java:8: 非法的类型开始
		ArrayList<E> arrayList = new ArrayList<>();
		                                       ^
0_0_8161179_6923\Main.java:52: 非法的类型开始
			queue = new Queue<>();
			                  ^
0_0_8161179_6923\Main.java:55: 非法的类型开始
				resultstep = new ArrayList<>();
				                           ^
0_0_8161179_6923\Main.java:56: 非法的类型开始
				curstep = new ArrayList<>();
				                        ^
4 错误