A: public class A implements C,D{ }
B: public class A implements C implements D{ }
C: public class A extends C,D{ }
D: public class A extends C extends D{ }
举一反三
- (1+X)假设 C 是抽象类,I1 和 I2 是接口。下列关于抽象类或接口的定义,哪一个是正确的( )。 A: public class A extends C implements I1,I2{} B: public class A extends I1,I2 implements C{} C: public class A implements I1,I2 extends C {} D: public class A extends C, I1, I2 {}
- 下面哪些语法结构是不正确的( ) A: public class A extends B implements C B: public class A implement A B C: public class A implements B,C,D D: public class A implements B
- 假设C是抽象类,I1和I2是接口。下列关于抽象类或接口的定义,哪一个是正确的? A: public class A extends C implements I1,I2{} B: public class A extendsI1,I2 implements C{} C: public class AimplementI1,I2extends C{} D: public class A extends C,I1,I2{}
- A类同时实现接口B和接口C,正确的写法是: A: public class A implements B, implements C {...} B: public class A implements B, C {...} C: public class A interface B, iinterface C {...} D: public class A extends B, C {...}
- 下列类的定义中,错误的是() A: class x{....} B: public x extends y{...} C: public class x extends y{....} D: class x extends y implements yl{....}
内容
- 0
下列类头定义中,错误的是 ?( )。 A: public x extends y B: public class x extends y C: class x D: class x extends y implements y1
- 1
列类头定义中,错误的是 A: public x extends y B: public class x extends y C: class x extends y implements y1 D: class x
- 2
下列哪个方法可用于创建一个可运行的类() A: public class X implements Runnable{public void run() {……}} B: public class X extends Thread{public void run() {……}} C: public class X extends Thread{public int run() {……}} D: public class X implements Runnable{protected void run() {……}}
- 3
下列哪个方法可用于创建一个可运行的类X? A: public class X implements Runnable{ public void run(){......} } B: public class X implements Thread{ public void run(){......} } C: public class X implements Thread{ public int run(){......} } D: public class X extends Runnable{ public void run(){......} }
- 4
下面关于子类继承父类,正确的是( )。 A: public class Student extends People{} B: public class Student implements People{} C: public class Student extends Teacher People{} D: 以上都不正确