[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$faFJMFTkYcF4gkVp5_Jh-YeF4mokfxCaeHfY0OGZHqpQ":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-06-15 23:23:49",151877422,[8,9,10,11],"import java.util.Scanner","import java.io.File","import java.io.File; package tt","package tt; import java.io.File",{"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","以下正错误的是",[21,33,43,52,61,70],{"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":35,"id":36,"options":37,"question":42,"source":31,"type":32},[],"2024-06-15 23:23:48",151877413,[38,39,40,41],"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":44,"createTime":35,"id":45,"options":46,"question":51,"source":31,"type":32},[],151877415,[47,48,49,50],"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","下列关于对象的类型转换的描述,说法错误的是( )",{"answer":53,"createTime":35,"id":54,"options":55,"question":60,"source":31,"type":32},[],151877418,[56,57,58,59],"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":62,"createTime":5,"id":63,"options":64,"question":69,"source":31,"type":32},[],151877420,[65,66,67,68],"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":71,"createTime":5,"id":6,"options":72,"question":19,"source":31,"type":32},[],[8,9,10,11]]