以下抽象类的定义中，错误的是？（）
A: abstract class Demo1{ }
B: abstract class Demo2{ public abstract String fun(String a); }
C: abstract class Demo3{ public String fun(){ return "abc"; } }
D: abstract class Demo4{ public static final String str = "abcde"; abstract void fun(){} }
A: abstract class Demo1{ }
B: abstract class Demo2{ public abstract String fun(String a); }
C: abstract class Demo3{ public String fun(){ return "abc"; } }
D: abstract class Demo4{ public static final String str = "abcde"; abstract void fun(){} }
举一反三
- 以下抽象类的定义中，错误的是？ A: abstract class Demo1{} B: abstract class Demo2{ public abstract String fun(String a); } C: abstract class Demo3{ public String fun(){ return \ D: abstract class Demo4{ public static final String CZBK = \高等教育 \
- 以下抽象类的定义中，错误的是？（） A: abstract class Demo1{} B: abstract class Demo2{ public abstract String fun(String a); } C: abstract class Demo3{ public String fun(){ return "CZBK"; } } D: abstract class Demo4{ public static final String CZBK = "传智播客"; abstract void fun(){} }
- 以下抽象类的定义中,错误的是 A: abstract class Demo1{} B: abstract class Demo2{<br>public abstract String fun(String a);<br>} C: abstract class Demo3{<br>public String fun(){<br>return "dlvtc";<br>}<br>} D: abstract class Demo4{<br>public static final String str= "dlvtc";<br>abstract void fun(){}<br>}
- 下列程序运行结果是( ) public class Demo { public static void main(String[] args) { Demo demo = new Demo(); demo.show(new Car() { public void run() { System.out.println("demo run"); } }); } public void show(Car c) { c.run(); } }abstract class Car { public void run() { System.out.println("car run..."); } }
- 给定代码如下: public abstract interface Frobnicate { public void twiddle(String s); } 以下哪个类是正确的?(). A: public abstract class Frob implements Frobnicate { public abstract void twiddle(String s) { } } B: public abstract class Frob implements Frobnicate { } C: public class Frob extends Frobnicate { public void twiddle(Integer i) { } } D: public class Frob implements Frobnicate { public void twiddle(Integer i) { } }