SCJP程序员认证考试
多选题Which two are true？（）AAn encapsulated， public class promotes re-use.BClasses that share the same interface are always tightly encapsulated.CAn encapsulated class allows subclasses to overload methods， but does NOT allow overriding methods.DAn encapsula
题目
An encapsulated， public class promotes re-use.
Classes that share the same interface are always tightly encapsulated.
An encapsulated class allows subclasses to overload methods， but does NOT allow overriding methods.
An encapsulated class allows a programmer to change an implementation without affecting outside code.
相似问题和答案
第1题：
public class SomeException { } Class a： public class a { public void doSomething（） { } } Class b： public class b extends a { public void doSomething（） throws SomeException { } } Which is true about the two classes？（）
- A、 Compilation of both classes will fail.
- B、 Compilation of both classes will succeed.
- C、 Compilation of class a will fail. Compilation of class b will succeed.
- D、 Compilation of class a will fail. Compilation of class a will succeed.
正确答案:D
第2题：
In which two cases does the compiler supply a default constructor for class A？（）
- A、 class A{}
- B、 class A { public A（）{} }
- C、 class A { public A（int x）{} }
- D、 class Z {} class A extends Z { void A（）{} }
正确答案:A,D
第3题：
A.The class implements java.lang.Comparable.
B.The class implements java.util.Comparator.
C.The interface used to implement sorting allows this class to define only one sort sequence.
D.The interface used to implement sorting allows this class to define many different sort sequences.
第4题：
class One { public One foo（） { return this； } } class Two extends One { public One foo（） { return this； } } class Three extends Two { // insert method here } Which two methods， inserted individually， correctly complete the Three class？（）
- A、 public void foo（） { }
- B、 public int foo（） { return 3； }
- C、 public Two foo（） { return this； }
- D、 public One foo（） { return this； }
- E、 public Object foo（） { return this； }
正确答案:C,D
第5题：
Which two allow the class Thing to be instantiated using new Thing（）？
- A、 public class Thing { }
- B、 public class Thing { public Thing（） {} }
- C、 public class Thing { public Thing（void） {} }
- D、 public class Thing { public Thing（String s） {} }
- E、 public class Thing { public void Thing（） {} public Thing（String s） {} }
正确答案:A,B
第6题：
Which two are true？（）
- A、 An encapsulated， public class promotes re-use.
- B、 Classes that share the same interface are always tightly encapsulated.
- C、 An encapsulated class allows subclasses to overload methods， but does NOT allow overriding methods.
- D、 An encapsulated class allows a programmer to change an implementation without affecting outside code.
正确答案:A,D
第7题：
Which three demonstrate an “is a” relationship？（）
- A、 public class X { } public class Y extends X { }
- B、 public interface Shape { } public interface Rectangle extends Shape{ }
- C、 public interface Color { } public class Shape { private Color color； }
- D、 public interface Species { } public class Animal { private Species species； }
- E、 public class Person { } public class Employee { public Employee（Person person） { }
- F、 interface Component { } class Container implements Component { private Component[] children； }
正确答案:A,B,F
第8题：
A.public class MinMax<?> {
B.public class MinMax<? extends Number> {
C.public class MinMax<N extends Object> {
D.public class MinMax<N extends Number> {
E.public class MinMax<? extends Object> {
F.public class MinMax<N extends Integer> {
第9题：
public class CreditCard { private String cardlD； private Integer limit； public String ownerName； public void setCardlnformation（String cardlD， String ownerName， 28. Integer limit） { this.cardlD = cardlD； this.ownerName = ownerName； this.limit = limit； } } Which is true？（）
- A、 The class is fully encapsulated.
- B、 The code demonstrates polymorphism.
- C、 The ownerName variable breaks encapsulation.
- D、 The cardlD and limit variables break polymorphism.
- E、 The setCardlnformation method breaks encapsulation.
正确答案:C
第10题：
Which the two demonstrate an “is a” relationship？（）
- A、 public interface Person {} Public class Employee extends Person {}
- B、 public interface Shape {} public interface Rectangle extends Shape {}
- C、 public interface Color {} public class Shape { private Color color； }
- D、 public class Species {} public class Animal { private Species species； }
- E、 interface Component {} Class Container implements Component {private Component [] children；
正确答案:B,E