There were so many students in the class that the teacher couldn’t talk to them all.翻译
There were so many students in the class that the teacher couldn’t talk to them all.翻译
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类Teacher和Student是类Person的子类; Person p; Teacher t; Student s; //p, t and s are all non-null. if(t instanceof Person) { s = (Student)t; } 最后一句语句的结果是:()A.将构造一个Student对象;B.表达式是合法的;C.表达式是错误的;D.编译时正确,但运行时错误。
类Teacher和Student都是类Person的子类 Person p; Teacher t; Student s; 若p,t和s都是非空值 if(t instanceof Person) { s = (Student)t; } 若默认new时声明的都是本类,这个语句导致的结果是()A.将构造一个Student对象B.表达式合法C.编译时非法D.编译时合法而在运行时可能非法
类 Teacher 和 Student 是类 Person 的子类; Teacher t; Student s; // t and s are all non-null. if (t instanceof Person ){ s=(Student)t; } 最后一条语句的结果是:A.将构造一个Student 对象;B.表达式是合法的;C.表达式是错误的;D.编译时正确, 但运行时错误。
现有代码t = ('a'),在Python3解释器中查看type(t)的结果为()A.<class 'str'>B.<class 'tuple'>C.(class 'str')D.(class 'tuple')
1、类Teacher和Student都是类Person的子类 Person p; Teacher t; Student s; 若p,t和s都是非空值,并且new时声明的都是本类; if(t instanceof Person) { s = (Student)t; } 这个语句导致的结果是什么?A.将构造一个Student对象B.表达式合法C.编译时非法D.编译时合法而在运行时可能非法
21、类Teacher和Student都是类Person的子类 Person p; Teacher t; Student s; 若p,t和s都是非空值,并且new时声明的都是本类; if(t instanceof Person) { s = (Student)t; } 这个语句导致的结果是什么?A.将构造一个Student对象B.表达式合法C.编译时非法D.编译时合法而在运行时可能非法
5、鼻爆破只可能出现在成音节中,例如:couldn't,wouldn't,hadn’t。