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SSD3 卡耐基课程选择题题库

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几乎将卡莱基网站上SSD3题库中选择题全部列出，绝对完美~从此不必再为ssd课程单选题目都看不明白而麻烦O(∩_∩)O哈哈~

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1.1.1

1. The name of a Java source file (d)

(a) must be the same as the class it defines, ignoring case

(b) must use the extension .class

(d) must be the same as the class it defines, respecting case

2. Which method must exist in every Java application? (a)

(a) main

(b) paint

(d) begin

1.1.3

1. Given the following code, how many tokens will be output? (b)

StringTokenizer st = new StringTokenizer("this is a test");

while (st.hasMoreTokens()) {

stdOut.println(st.nextToken() );

}

(a) 1 (b) 4 (c) 0 (d) 3

2. Classes from which of the following packages are implicitly imported into every Java program?

(a) java.awt (d)

(b) java.io

(d) java.lang

3. What is the name of the wrapper class for the type int? (d)

(a) integer

(b) Int

(d) Integer

4. Classes from which of the following packages are implicitly imported into every Java program?

(a) java.util (c)

(b) java.awt

(d) java.io

5. The term wrapper classes refers to (a)

(a) a collection of Java classes that "wrap" Java primitive types

(b) the Java classes that contain at least two data fields

(d) a collection of Java classes that contain other Java classes

6. What will be output caused by the execution of the following Java program segment? (c)

String name = "Elvis";

System.out.print(name + "was here");

(a) name + was here

(b) Elvis was here

(d) name was here

1.1.4

1. What will be output when the following Java program segment is executed? (c)

int x = 5;

int y = 2;

System.out.println(x + y);

(a) 5 2

(b) 5+2

(d) 52

2. A difference between the methods print and println of the class java.io.PrintWriter is that (a)

(a) println appends a new line to the end of its output, but print does not

(b) print appends a new line to the end of its output, but println does not

(d) print inserts a new line at the beginning of its output, but println does not

3. Consider the following Java program segment. (c)

int x = 5;

int y = 2;

System.out.println(x + "1" + y);

Which of the following statements is true about the program segment?

(a) The output caused by the code will be 8.

(b) The output caused by the code will be 5 1 2.

(d) The code will cause a compilation error.

1.1.5

1. All Java exception classes are derived from the class (a)

(a) java.lang.Throwable

(b) java.lang.Error

(d) java.io.IOException

2. In Java, exceptions that are not handled are passed up the (b)

(a) exception ladder

(b) call stack

(d) catch blocks

3. What is the right way to handle abnormalities in input on Java? (d)

(a) By writing while loops to guard against bad input

(b) By always specifying the throws clause in every method header where file I/O is performed

(d) By handling these problems by providing exception handlers

4. Consider the following Java program segment.

import java.io.*;

public class SomeClass{

public void x() {

throw new RuntimeException("Exception from x");

}

public void y(){

throw new IOException("Exception from y");

}

Which of the following is true concerning the definitions for the methods x and y? (a)

(a) x has a legal definition, but y has an illegal definition.

(b) x has an illegal definition, but y has a legal definition.

(d) Both x and y have legal definitions.

1.1.6

1. Which of the following statements is true of the conventions outlined by Sun Microsystems in

the document entitled Code Conventions for the Java Programming Language? (d)

They define a standard interface definition language that must be used for all Java classes.

They provide recommendations intended to make source code easier to read and understand.

They describe one mechanism for network communication between Java and C++ programs.

(a) III only

(b) I and III only

(d) II only

Feedback: See section 1.1.6, subsection "CodeConvTOC" and section 1.1, subsection "Why Have

Code Conventions," in the course notes.

2. According to the Java code conventions, files that contain Java source code have the suffix

_____, and compiled bytecode files have the suffix _____. (d)

(a) .class, .javac

(b) .javac, .class

(d) .java, .class

Feedback: See section 1.1.6, subsection "CodeConvTOC" and section 2.1, subsection "File

Suffixes," in the course notes.

3. According to the document entitled Code Conventions for the Java Programming Language, file

suffixes used by Java software include which of the following? (b)

.obj

.class

(a) I and III only

(b) II only

(d) II and III only

1.1.7

1. Which of the following patterns of characters opens a Javadoc comment block? (b)

(a) /*

(b) /**

(d) //

1.1.8

1. After a typical debugger encounters a breakpoint, the programmer using the debugger may

perform which of the following actions? (a)

Examine the values of variables in the halted program

Execute the current line

Resume execution of the halted program

(a) I, II, and III

(b) I and II only

(d) III only

2. In a typical source-code debugger, a programmer can set a _____ to cause a program to stop

executing at a particular line of code. (c)

(a) test case

(b) stack trace

(d) print statement

3. A stack trace is (b)

(a) a list of variables allocated on a program's stack

(b) a sequence of method calls

(d) a fatal error that causes a typical debugger to terminate

4. A tool that allows programmers to execute lines of a program one line at a time in order to help

locate the source of a program's errors is known as a(n) (b)

(a) stack trace

(b) debugger

(d) exception handler

1.1.

1．According to Javadoc convention, the first sentence of each Javadoc comment should be (c)

(a) an @author tag

(b) an @version tag

(d) the order of lines is not important

Feedback: See http://java.sun.com/j2se/javadoc/writingdoccomments/index.html#format for more

information.

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