麻烦大家帮忙看看，thx!!!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | //这是测试方法public void testContains(){ Course course = courseToSelect.get(0); System.out.println("取得备选课程："+course.name); System.out.println("备选课程中是否包含本课程："+course.name+", "+courseToSelect.contains(course)); Course course2 = new Course(course.id,course.name); System.out.println("新建课程："+course2.name); System.out.println("备选课程中是否包含本课程："+course2.name+", "+courseToSelect.contains(course2)); System.out.println("请输入要查询的课程名称："); String name = sc.next(); Course course3 = new Course(); course3.name = name; System.out.println("备选课程中是否包含本课程："+course3.name+", "+courseToSelect.contains(course3)); } //这是Course类里面重写的equals方法@Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if(!(obj instanceof Course)) return false; Course other = (Course) obj; if (this.id == null) { if (other.id != null) return false; } else if (!id.equals(other.id)) return false; if (this.name == null) { if (other.name != null) return false; } else if (!this.name.equals(other.name)) return false; return true; } |
这里为什么会是false呢？
