测试contanisAll方法，如何改进不区分字母大小写？
/*
* 测试List的contanisAll方法
*/
private void testListContanisAll() {
System.out.println("请输入课程名称集合，以,分割");
String[] arr = console.next().split(",");
while (true) {
if(arr.length == 0) {
System.out.println("请输入课程名称");
continue;
}else {
for(String name: arr) {
Course course = new Course();
course.name = name;
System.out.println("取得课程为：" + course.name);
System.out.println("备选课程中是否包含课程：" + course.name +
"," + coursesToSelect.contains(course));
}
break;
}
}
}
