单选题Given a class Repetition： 1.package utils； 2. 3.public class Repetition{ 4.public static String twice（Strings）{returns+s；} 5.} and given another class Demo： 1.//insert code here2. 3.public class Demo{ 4.public static void main（String[]args）{ 5.System.o - 搜考题

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题目

单选题

Given a class Repetition： 1.package utils； 2. 3.public class Repetition{ 4.public static String twice（Strings）{returns+s；} 5.} and given another class Demo： 1.//insert code here2. 3.public class Demo{ 4.public static void main（String[]args）{ 5.System.out.println（twice（"pizza"））； 6.} 7.} Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”？（）

A

import utils.*；

B

static import utils.*；

C

importutils.Repetition.*；

D

static importutils.Repetition.*；

E

import utils.Repetition.twice（）；

F

import static utils.Repetition.twice；

G

static import utils.Repetition.twice；

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相似问题和答案

第1题：

Given:10. interface Data { public void load(); }11. abstract class Info { public abstract void load(); }Which class correctly uses the Data interface and Info class?()()

A.

B.

C.

D.

E.

F.

参考答案：A

第2题：

Given:Which statement is true about the class of an object that can reference the variable base? ()

A.It can be any class.

B.No class has access to base.

C.The class must belong to the geometry package.

D.The class must be a subclass of the class Hypotenuse.

参考答案：C

第3题：

public class Test{2.int x=12;3.public void method(intx){4.x＋=x;5.System.out.println(x);6.}7.}Given:34.Test t=new Test();35.t.method(5);What is the output from line 5 of the Test class?()

A.5

B.10

C.12

D.17

E.24

参考答案：B

第4题：

Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）

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.

正确答案:A,C

第5题：

Which two statements are true about the hashCode method？（）

A、 The hashCode method for a given class can be used to test for object equality and object inequality for that class.
B、 The hashCode method is used by the java.util.SortedSet collection class to order theelements within that set.
C、 The hashCode method for a given class can be used to test for object inequality， but NOT object equality， for that class.
D、 The only important characteristic of the values returned by a hashCode method is that the distribution of values must follow a Gaussian distribution.
E、 The hashCode method is used by the java.util.HashSet collection class to group the elements within that set into hash buckets for swift retrieval.

正确答案:C,E

第6题：

Given:Which two, inserted at line 11, will allow the code to compile?()

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> {

参考答案：D, F

第7题：

Given a class Repetition:Which code should be inserted at line 1 of Demo.java to compile and run Demo to print "pizzapizza"?()

A.import utils.*;

B.static import utils.*;

C.import utils.Repetition.*;

D.static import utils.Repetition.*;

E.import utils.Repetition.twice();

F.import static utils.Repetition.twice;

G.static import utils.Repetition.twice;

参考答案：F

第8题：

Given:What can directly access and change the value of the variable name?()

A. any class

B. only the Target class

C. any class in the test package

D. any class that extends Target

参考答案：C

第9题：

1. public class a { 2. public void method1（） { 3. try { 4. B b=new b（）； 5. b.method2（）； 6. // more code here 7. } catch （TestException te） { 8. throw new RuntimeException（te）； 9. } 10. } 11. } 1. public class b { 2. public void method2（） throws TestException { 3. // more code here 4. } 5. } 1. public class TestException extends Exception { 2. } Given： 31. public void method（） { 32. A a=new a（）； 33. a.method1（）； 34. } Which is true if a TestException is thrown on line 3 of class b？（）

A、 Line 33 must be called within a try block.
B、 The exception thrown by method1 in class a is not required to be caught.
C、 The method declared on line 31 must be declared to throw a RuntimeException.
D、 On line 5 of class a， the call to method2 of class b does not need to be placed in a try/catch block.

正确答案:B

第10题：

定义类： package utils； public class Rep{ public static String twice （String s）{return s+s ；} } 再定义另一个类Demo： //insert code here public class Demo{ public static void main （String[] args）{ System. out .println（ twice（ "Hello"））； } } 在第一行插入哪项代码，可以使程序正常编译和执行？（）

A、import utils.*；
B、 import utils.Rep.*；
C、 import static utils.Rep.twice；
D、 static import utils.Rep.twice；

正确答案:C

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