JAVA试题英版(答案).docVIP

一．Which two demonstrate an “is a” relationship? (Choose Two) A. public interface Person { }//语法错了 public class Employee extends Person { } B. public interface Shape { }//语法错了 public class Employee extends Sha pe { } C. public interface Color { }//语法错了 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; 二．which statement is true? A. An anonymous inner class may be declared as final B. An anonymous inner class can be declared as private C. An anonymous inner class can implement mutiple interfaces D. An anonymous inner class can access final variables in any enclosing scope （不能） E. Construction of an instance of a static inner class requires an instance of the encloing outer class 构造一个静态的内部类对象需要构造包含它的外部类的对象 三. Given: 1. package foo; 2.? 3. public class Outer ( 4.??? public static class Inner ( 5.??? ) 6. ) Which statement is true? A. An instance of the Inner class can be constructed with “new Outer.Inner ()” B. An instance of the inner class cannot be constructed outside of package foo 他们都是public的，只要在外部import就行 C. An instance of the inner class can only be constructed from within the outer class D. From within the package bar, an instance of the inner class can be constructed with “new inner()” 四．Exhibit（展览、陈列）： 1 public class enclosinggone{ 2 public class insideone{} 3 } 4 public class inertest{ 5 public static void main (String[] args){ 6 enclosingone eo = new enclosingone(); 7 //insert code here 8 } } Which statement at line 7 constructs an instance of the inner class? A. InsideOne ei = eo.new InsideOne(); 写程序试出来 B. Eo.InsideOne ei = eo.new InsideOne(); C InsideOne ei = EnclosingOne.new InsideOne(); D.EnclosingOne InsideOne ei = eo.new InsideOne(); 五． 1)? interface Foo{ ?? 2)? ???????? int k=0; ?? 3)??? } ?? 4) public class Test implements Foo{ ?? 5)???????????? public static void m