大家好，我是讯享网，很高兴认识大家。

1. The name of a

Java

source file

(a) has no restrictions

(b) must be the same as the

class

it defines, ignoring case

(c) must use the extension .

class

(d) must be the same as the

class

it defines, respecting case

2. Which of the following statements is (are) true about the use of an asterisk (*) in a

Java

import statement?

Ⅰ.It does not incur run-time overhead.

Ⅱ.It can be used to import multiple packages with a single statement.

Ⅲ.It can be used to import multiple

class

es with a single statement

(a) I, II, and III

(b) I and III only

(c) I only

(d) III only

.....

9. According to the

Java

code conventions, files that contain

Java

source code have the suffix _____, and compiled bytecode files have the suffix _____.

(a) .

class

, .

java

(b) .

class

, .

java

c

(c) .

java

, .

class

(d) .

java

c, .

class

10. As an aid in debugging a program in

Java

, print statements may be used to display which of the following types of information?

I. The names of methods being called

II. The values of the parameters of a method

Ⅲ. The values of the instance variables of a

class

(a) I and II only (b) I and III only

(c) II and III only (d) I, II, and III

1. In a UML

class

diagram's representation of a

class

, the top, middle, and lower rectangular compartments respectively describe the _____ of the

class

.

(a) name, attributes, and methods (b) name, methods, and constants

(c) 笔试题 java基础 英文 attributes, methods, and name (d) attributes, methods, and constants

2. UML

class

diagrams can describe which of the following?

I. The in

tern

al structure of

class

es

Ⅱ. Relationships between

class

es

(a) I and II (b) II only (c) None (d) I only

.......

1.The term

class

variable is a synonym for

(a) a private data field

(b) a static data field

(c) a read-only variable

(d) an instance variable

2. Consider the following

Java

program segment.

import

java

.io.*;

public

class

Test {

public Test( ) {

System.out.println("default");

}

public Test( int i ) {

System.out.println("non-default");

}

public static void main(String[] args) {

Test t = new Test(2);

}

}

.........

9. When a

subclass

defines an instance method with the same return type and signature as a method in its parent, the parent's method is said to be

(a) private (b) hidden (c) overloaded (d) overridden

10. Which is a

Java

access modifier used to

design

ate that a particular data field will not be inherited by a

subclass

?

(a) final (b) protected (c) private (d) default

1. Consider the following

Java

program segment.

String[] str = {"Three","Two","One"};

for (int i = 0; i < str.length; ++i) {

System.out.println(str[i]+"/");

}

What will be output upon execution of the program segment?

(a) Three/Two/One/ (b) Three,Two,One

(c) One,Two,Three (d) One/Two/Three/

2. Consider the following

Java

program segment.

int[] arr;

arr = new int[3];

arr[2]=19;

arr[1]=17;

arr[0]=15;

Which of the following

Java

statements is syntactically correct and semantically identical to the program segment?

(a) int[] arr= {15, 17, 19};

(b) int[3] arr = {15, 17, 19};

(c) int arr = {15, 17, 19};

(d) int arr[3]= {15, 17, 19};

........

2. Which of the following statements is (are) true about any

abstract

method in

Java

?

I. It contains no definition.

Ⅱ. It cannot be declared public.

(a) I and II (b) I only (c) None (d) II only

3. Consider the following

Java

program fragment.

public void drive(Vehicle v) {

...

}

...

drive(obj);

The method call drive(obj) is valid if obj is which of the following?

I. A descendent of

class

Vehicle

II. An ancestor of

class

Vehicle

Ⅲ. An object of

class

Vehicle

(a) I and III only (b) I, II, and III

(c) III only (d) II and III only