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为什么不可以使用引用数组的对象school调用引用类School的方法open？？？
class School{
private boolean isOpen = false;
public void open(){
this.isOpen = true;
}
public boolean isOpen(){
return this.isOpen;
}
}
publib class Test{
School[] school = new School[2];
School higher = new
School("higher");
School primary = new
School("primary");
school[0] = higher;
school[1] = primary;
//school.open();//error! why??
higher.open();//right!
}