31、实现interface的方法前一定要用public修饰
31、实现interface的方法前一定要用public修饰
参考答案和解析
正确
相关考题：
如果创建的一个子类覆盖一个父类public方法，则对该方法可以使用哪些修饰符修饰?A．publicB．public 和 protectedC．priviteD．任意修饰符都可以，由系统随机选取
使用jdbc 编写class EnrollmentImpl 实现接口 Enrollment:public interface Enrollment{public void createStudent(Student student) throws Exception;pubic void createCourse(Course course) throws Exception;public void enroll(Student student, Course course) throws Exception;public void exam(Student, Course course, float grade) throws Exception;}
以下对接口描述错误的有( )A)接口没有提供构造方法B)接口中的方法默认使用public、abstract修饰C)接口中的属性默认使用public、static、final修饰D)接口不允许多继承
接口中的方法默认是public abstract方法,所以类在实现接口方法时必须给出方法体,并且一定要用public来修饰,而且接口中的常量默认是public static常量。() 此题为判断题(对，错)。
public interface A { String DEFAULT_GREETING = “Hello World”； public void method1（）； } A programmer wants to create an interface called B that has A as its parent. Which interface declaration is correct？（） A、 public interface B extends A {}B、 public interface B implements A {}C、 public interface B instanceOf A {}D、 public interface B inheritsFrom A {}
Which three demonstrate an “is a” relationship？（） A、 public class X { } public class Y extends X { }B、 public interface Shape { } public interface Rectangle extends Shape{ }C、 public interface Color { } public class Shape { private Color color； }D、 public interface Species { } public class Animal { private Species species； }E、 public class Person { } public class Employee { public Employee（Person person） { }F、 interface Component { } class Container implements Component { private Component[] children； }
Which the two demonstrate an “is a” relationship？（）A、 public interface Person {} Public class Employee extends Person {}B、 public interface Shape {} public interface Rectangle extends Shape {}C、 public interface Color {} public class Shape { private Color color； }D、 public class Species {} public class Animal { private Species species； }E、 interface Component {} Class Container implements Component {private Component [] children；
Which two demonstrate an “is a” relationship？（） A、 public interface Person { } public class Employee extends Person { }B、 public interface Shape { } public class Employee extends Shape { }C、 public interface Color { } public class Employee extends Color { }D、 public class Species { } public class Animal （private Species species；）E、 interface Component { } Class Container implements Component （ Private Component[ ]children； ）
多选题Which three demonstrate an “is a” relationship？（）Apublic class X { } public class Y extends X { }Bpublic interface Shape { } public interface Rectangle extends Shape{ }Cpublic interface Color { } public class Shape { private Color color； }Dpublic interface Species { } public class Animal { private Species species； }Epublic class Person { } public class Employee { public Employee（Person person） { }Finterface Component { } class Container implements Component { private Component[] children； }
多选题Which two demonstrate an “is a” relationship？（）Apublic interface Person { } public class Employee extends Person { }Bpublic interface Shape { } public class Employee extends Shape { }Cpublic interface Color { } public class Employee extends Color { }Dpublic class Species { } public class Animal （private Species species；）Einterface Component { } Class Container implements Component （ Private Component[ ]children； ）
多选题Which the two demonstrate an “is a” relationship？（）Apublic interface Person {} Public class Employee extends Person {}Bpublic interface Shape {} public interface Rectangle extends Shape {}Cpublic interface Color {} public class Shape { private Color color； }Dpublic class Species {} public class Animal { private Species species； }Einterface Component {} Class Container implements Component {private Component [] children；
单选题public interface A { String DEFAULT_GREETING = “Hello World”； public void method1（）； } A programmer wants to create an interface called B that has A as its parent. Which interface declaration is correct？（）A public interface B extends A {}B public interface B implements A {}C public interface B instanceOf A {}D public interface B inheritsFrom A {}