? public void testSetContains(){

? //提示輸入課程名稱

? System.out.println("請(qǐng)輸入學(xué)生已選的課程名稱：");

? String name=console.next();

? //創(chuàng)建一個(gè)新的課程對(duì)象，ID和名稱，與course對(duì)象完全一樣

? Course course2=new Course();

? course2.name=name;

? System.out.println("新創(chuàng)建課程："+course2.name);

? System.out.println("備選課程中是否包含課程："+course2.name+","+student.courses.contains(course2));

? }

執(zhí)行到畫線句出現(xiàn)錯(cuò)誤，問題應(yīng)該在student.courses.contains(course2),但是已經(jīng)定義public Student student; ?而且

public class Student {

public String id;

public String name;

public Set<Course> courses;//Set和List一樣都是Collection的子接口

public Student(String id,String name){

this.id=id;

this.name=name;

this.courses=new HashSet<Course>();?

}

}