package?com.imooc.collection; import?java.util.ArrayList; import?java.util.List; public?class?TestGeneric?{ private?void?testForEach()?{ //?TODO?自動生成的方法存根 } public??List<Course>?courses; ??????public?TestGeneric(){ ???? ??this.courses=new?ArrayList<Course>(); ???? ? ?????}; ?????/* ??????*?測試添加 ??????*/ ?????public?void?testAdd(){ ???? ?Course?cr1=new?Course("1","大學(xué)英語"); ???? ?courses.add(cr1); ???? ?//泛型集合中不能添加泛型規(guī)定類型以外的對象；否則會報錯; ???? ?//courses.addAll("能否添加一些奇怪的數(shù)字呢"); ???? ?Course?cr2=new?Course("2","java基礎(chǔ)"); ???? ?courses.add(cr2); ?????} ???? ?//測試循環(huán)遍歷 ???? ?public?void?testForEach1(){ ???? for?(Course?cr:courses){ ???? System.out.println(cr.id+":"+cr.name); ???? ???? } ?????} ???? ?public?static?void?main(String[]?args)?{ ???? ???? TestGeneric?tg=new?TestGeneric(); ???? tg.testAdd(); ???? tg.testForEach(); ???? //?TODO?自動生成的方法存根 ???? /* ???? ?*?帶有泛型————Course,的List類型屬性; ???? ?*/ ???? } }