[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fycuj2f0le3kahh6ONBue3XiUgXGPToGXAuZebzTVX28":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-06-15 23:23:48",151877415,[8,9,10,11],"对象的类型转换可通过自动转换或强制转换进行","无继承关系的两个类的对象之间试图转换会出现编译错误","由new语句创建的父类对象可以强制转换为子类的对象","子类的对象转换为父类类型后,父类对象不能调用子类的特有方法",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},6,"686484b5c711dad9bec3133c5802a712","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff416a82ee50c5f966406b5d3c525d174.JPG","Java程序设计（原课程名《Java语言与网络编程》）","work_34945140","第四章作业","下列关于对象的类型转换的描述,说法错误的是( )",[21,33,42,45,54,64],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2024-06-15 23:23:47",151877411,[26,27,28,29],"产生编译错误","代码可以编译运行,并输出结果AB","代码可以编译运行,但没有输出","编译没有错误,但会产生运行时异常","下面程序运行的结果是( )public class A { public static void main(String[] args) { B b = new B(); b.test(); } void test() { System.out.print("A"); }}class B extends A { void test() { super.test(); System.out.print("B"); }}","v1",0,{"answer":34,"createTime":5,"id":35,"options":36,"question":41,"source":31,"type":32},[],151877413,[37,38,39,40],"Java中一个类只能有一个直接父类","多个类可以继承一个父类","Java中,C类继承B类,B类又继承A类,这时,C类也可称作A类的子类","Java是支持多继承的","下列关于继承的描述中,错误的是()",{"answer":43,"createTime":5,"id":6,"options":44,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":46,"createTime":5,"id":47,"options":48,"question":53,"source":31,"type":32},[],151877418,[49,50,51,52],"接口中定义的方法默认使用"public abstract"来修饰","接口中的变量默认使用"public static final"来修饰","接口中的所有方法都是抽象方法","接口中定义的变量可以被修改","下列关于接口的说法中,错误的是( )",{"answer":55,"createTime":56,"id":57,"options":58,"question":63,"source":31,"type":32},[],"2024-06-15 23:23:49",151877420,[59,60,61,62],"dog1.equals(dog2)","s1.equals(s2)","s3.equals(s4)","dog1==dog2","阅读下段代码:class Dog { public String name; Dog(String name){ this.name =name; }}public class Demo1 { public static void main(String[] args){ Dog dog1 = new Dog("xiaohuang"); Dog dog2 = new Dog("xiaohuang"); String s1 = dog1.toString(); String s2 = dog2.toString(); String s3 = "xiaohuang"; String s4 = "xiaohuang"; }}返回值为true的是( )",{"answer":65,"createTime":56,"id":66,"options":67,"question":72,"source":31,"type":32},[],151877422,[68,69,70,71],"import java.util.Scanner","import java.io.File","import java.io.File; package tt","package tt; import java.io.File","以下正错误的是"]