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 \
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 "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{ 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(){} }
- 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..."); } }
- 下列哪个类声明是正确的 ( ) A: abstract class G2 extends superClass1,superClass2{...} B: abstract public class classmates{...} C: public final class NewClass extends superClass implemnets Interface1{...} D: public abstract class String{...}
内容
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下列哪个类声明是正确的 ( ) A: A) abstract class G2 extends superClass1, superClass2 … B: B) abstract public class classmates… C: C) public final class NewClass extends superClass implemnets Interfacel… D: D) public abstract class String…
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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) { } }
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（7-1）以下程序的运行结果是（ ）。 class A{ A(){ System.out.print(10); } } public class Demo extends A { public static void main(String[] args) { new A(); new Demo(); } }
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{下面程序编译运行的结果是( )class Demo <;T>; {void setData(T a){System.out.print(a);};}public class Demo2015 {public static void main(String[]a){Demo<;String>; d = new Demo<;String>;();d.setData("a");d.setData(1);}}} A: a B: 1 C: a1 D: 编译错误
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6、阅读下列代码，构造方法（）可以存在于上述Demo类中。public class Demo{......Demo(){}......} A: public Demo(){} B: private Demo(){} C: public Demo( int age ){} D: String name(){}