為什么獎這兩個course數(shù)據(jù)里的內(nèi)容提取出來時get位置是一樣的，卻都能顯示出來而不會被覆蓋？
course[] cr4 = { new course("5", "離散數(shù)學"), new course("6", "java語言") };
beixuankecheng.addAll(Arrays.asList(cr4));
course kc3=(course) beixuankecheng.get(2);
course kc4=(course) beixuankecheng.get(3);
System.out.println("添加了兩毛課程"+kc3.id+kc3.name+kc4.id+kc4.name);
course []cr5={ new course("6", "高等數(shù)學"), new course("7", "c#語言") };
course kc5=(course) beixuankecheng.get(2);
course kc6=(course) beixuankecheng.get(3);
System.out.println("添加了門毛課程"+kc5.id+kc5.name+kc6.id+kc6.name);
2017-10-08
beixuankecheng.addAll(Arrays.asList(cr5));
希望對你有所幫助(●￣(?)￣●)