题目内容

下列【1】、【2】、【3】、【4】注释标注的哪行代码有错误？public interface Com {abstract void cry();//【1】public int x = 0;//【2】}abstract class Animal implements Com {public abstract void cry();}class E {public static void main(String args[]){Animal dog = null ; // 【3】dog = new Animal(); // 【4】}}

A. 【1】
B. 【2】
C. 【3】
D. 【4】

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给出下列【代码】注释标注的代码的输出结果。interface Com {public abstract char cry();}class Dog implements Com{public char cry(){return 'D';}}class Cat implements Com{public char cry(){return 'C';}}class People {Com com;char seeCry(Com com){return com.cry();}}public class E {public static void main(String args[]){People p = new People ();char c1 = p.seeCry(new Dog());char c2 = p.seeCry(new Cat());System.out.printf("%c:%c",c1,c2);//【代码】}}

interfaceCom{intadd(inta,intb);publicstaticintget(intn){returnn;}publicdefaultintsee(intn){returnn;}publicdefaultintlook(intn){returnn;}}classAimplementsCom{publicintadd(inta,intb){returna+b;}publicintsee(intn){returnn+1;}}publicclassMain{publicstaticvoidmain(Stringargs[]){Aa=newA();intm=a.add(12,6);intn=Com.get(12);intt=a.see(6);intq=a.look(6);System.out.printf("%d:%d:%d:%d",m,n,t,q);//【代码】}}

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According to video 1, Vertov's work can perhaps best be described as constructive realism.

A. 对
B. 错