【单选题】The police went into action______ they heard the alarm.
【单选题】The policemen went into action______when they heard the alarm.
【单选题】假设c1、c2和c3是3个命令。以下哪个命令表示c1执行成功才执行c2,c1执行出错则不执行c2。不论c1出错与否,后面都会执行c3?
【判断题】培育和践行社会主义核心价值观,不需要从娃娃抓起,不需要从小事做起。
【单选题】The policemen went into action ______ they heard the alarm.
【单选题】给定以下类和它们的对象:class C1 {};class C2 extends C1 {};class C3 extends C1 {};C2 c2 = new C2();C3 c3 = new C3();分析以下赋值语句c2 = (C2)((C1)c3);
B.
得到一个错误,因为不能从兄弟类进行 对象 显示转换。
C.
得到一个错误,因为java无法 嵌套 执行多个 对象 显示 转换
【单选题】In the first week, Jenna went to tryouts(选拔赛)for cheerleaders(拉拉队队员). She was competing against very talented girls, and she knew it would be for her to be selected. [ ]
【单选题】给定以下类及其对象: class C1 {}; class C2 extends C1 {}; class C3 extends C1 {}; C2 c2 = new C2(); C3 c3 = new C3(); 分析以下语句: c2 = (C2)((C1)c3);
B.
您将收到运行时错误,因为无法从同级类强制转换对象。
C.
您将收到一个运行时错误,因为Java运行时系统无法以嵌套形式执行多次转换。