public?void?testListContains(){
Course?courses1=coursesToSelect.get(0);
System.out.println("課程信息為"+courses1.id+":"+courses1.name+","+coursesToSelect.contains(courses1));
Course?courses2=new?Course(courses1.id,courses1.name);
System.out.println("課程信息為"+courses2.id+":"+courses2.name+","+coursesToSelect.contains(courses2));
}


public?boolean?eaquals(Object?obj){
if(this==obj)
return?true;
if(obj==null)
return?false;
if(!(obj?instanceof?Course))
return?false;
//通過以上3個if判斷，obj是一個Course類型且不為空的對象。
Course?courses=(Course)obj;
if(this.name==null){
if(courses.name!=null)
return?false;
else?return?true;
}
else
if(this.name.equals(courses.name))
return?true;
else?return?false;
}