SmallPepsi

摘要： Student s1 = new Student(14,"张三");Student s2 = new Student(12,"王五");Student s3 = new Student(16,"李四");Student s4 = new Student(11,"lucy");List<Student 阅读全文

摘要： List<String> list = new ArrayList<String>();list.add("b");list.add("a");list.add("123");list.add("a");System.out.println(list);//反转list集合的顺序Collection 阅读全文