最新习题解答finalversion汇总

Java习题答案第1章一、选择题1. B2.B3.C4.C5.C6.C二、填空题1.简单的、面向对象的、分布式的、健壮的、体系结构中立的、安全的、可移植的、解释的、高性能的、多线程的、动态的语言2.编辑源程序；编译生成字节码；解释运行字节码3.Java Application程序；Java Applet程序4.包含；继承；关联5.将Java程序源代码被译成字节码之后，交由Java运行环境（JRE）解释执行6.多行执行注释；单行注释；文档注释7.一个类（class）定义了将被一个对象集共享的结构和行为（数据和代码）8.由多个与某种特定用途相关的类组合而成，因此，可以将包理解成一个包含许多类的类库三、判断题1.错2.错3.对四、程序设计题1.定义一个类的语法如下：Class 类标识// 开始定义类，并定义类的标识{修饰符数据类型字段标识// 定义成员变量修饰符数据类型方法标识（参数表）// 定义成员方法{方法的内容}}//完成类的定义2.程序名为：MyJavaZYApplet.java程序内容：import java.awt.graphics;import java.applet. Applet;pub;ic class MyJavaZYApplet extends Applent{public void (Graphics g){g.drawString(“Welcome to Java Applet Word !”,10,20)}}第2章一、选择题1.true ;false2. 2 ;23.94.false5.static double additoryFee=0.1;6. 47.String ;StringBuffer;8.a;5/7将产生无限不循环小数，而float与douboe两种数据类型的精度不同，因此产生不相等的输出值9.b;5/8将得到0.625，float与double两种数据类型的精度不相等，因此将产生相等的产出10.||11.局部变量；类变量；方法参数变量；异常处理参数变量12.字节型(bute)；短整型(short)；整型(int)；长整型(long)；字符型(char)；浮点数(float)；双精度(double)；布尔型(boolean)13.readline()三、判断题1.错2.对3.错4.错5.错四、程序设计题1.参考程序：import java.io.*;public class Class1{ public static void main(String [] args){int i,j,max,min;int x[]=new int[10];Strng s;try{System.out.print(”请输入十个整数：”)；for (j=0;j<10;j++){Bufferedreader br=new Bufferedreader(new InputStreamReader(System.in));s=br.readLine();`x[j]=Integer.parseInt(s);}}catch(IOExpection e){}max=min=x[10];for(i=1;i<10;i++)if(min>x[i]) min=x[i];}System.out.println(“十个数中最大的是：”＋max);System.out.println(“十个数中最小的是：”＋min);}}import java.io.*;public class SUM{public static void main(String [] args){ int I,n=-1,sum=0;while(n<1)try{Bufferedreader br=new Bufferedreader(new InputStreamReader(System.in));n= Integer.parseInt( br.readLine());}catch(IOExpection e){}for(i=1;i<=n;i++)sum+=i;System.out.println（sum）;}}第3章一、选择题1.C2.C3.C4.D5.C6.D7.B二、填空题1.抽象方法；final（最终）方法2.方法头；方法体[public|private|protected][static][final][abstract][native][sync hronized]返回值类型方法名（[形式参数表]）[throws异常列表]{方法体语句}；3.for语句;while语句；do-while语句；4.if 语句；switch语句5.(year%4==0 && year%100!=0)||(year%400==0)6.初始化部分；循环体部分；迭代部分；终止部分；7.迭代表达式；条件表达式三、判断题1.错2.对3.（3）合法，而（1）（2）（4）均不是合法的循环结构4.对5.错6.对7.错四、程序设计题1.程序可描述如下：{public static void main(String [] args){double sum=0.0;for(int i=1;i<=100;i++)sum+=1.0/(double) i;System.out.println(“sum=”+sum);}}2.函数可描述如下：public class Ret{public static int fact(int n);{int ret=n;for(i=1;i<n;i++)< p="">ret=ret*i;return ret;}}3.参考程序如下：class answer3{public static void main（String args[]）{double d1=10000.11;double d2=2004.33;if(d1<=d2)System.out.println(d2+”>=”+d1); elseSystem..outprintln(d1+”>=”+d2);}}第4章一、选择题1.B2.C3.D4.A5.A6.D二、填空题1.从标准输入（即键盘）读入10个整数存入整型数a中，然后输出这10个整数2.在数组中查找最大值和最小值3.List myList=new ArrayList()三、判断题2.对四、程序设计题import java.io.*;public class SelectSort{public static void main(String args[]){int a[]={20,10,50,40,30,70,60,80,90,100};int temp;for(int i=0;i<a.length-1;i++)< p="">for(int j=i+1;j<a.length;j++)< p="">{if(a[i])<a[j])< p="">{temp=a[i];a[i=a[j];a[j]=temp;}}}for(int k =0;k<a.length;k++)< p="">{System.out.println(“a[”+k+”]”+a[k]);}}}第5章一、选择题1.C2.A3.A4.B5.D6.C7.B二、填空题1.抽象（abstract）；最终(final)2.单；多3.static double additoryFee=0.1;4.private public protected default; public5.Object6.new7.模板；实例8.同一包中的9.this10.(1)只有当一个对象不被任何引用类型的变量引用时，它的内存才能被垃圾回收站回收（2）不能通过程序强迫垃圾回收立即执行（3当垃圾回收器将要释放无用对象的内存时，先调用该对象的finalize方法11.package命令1.错2.错3.错4.对5.错6.对7.错8.错9.对10.错11.错12.错四、程序设计题1.参考程序如下：public class Point{int x,y;public Point(int x, int y){this.x=x;this.y=y;}void setX(int x){this.x=x;}void setY(int y){this.y=y;}int getX(){return this.x;}int getY(){return this.y}}public static void main(String args[]){Point point1=new Point(3,4);System.out.println(“Pointlocation:”+point1.getX()+”,”++point1.getY());point1.setX(8);point1.setY(8);Syste m.out.println(“Pointlocation:”+point1.getX()+”,”++point1.getY());}}或者：import java.io.*;public class Pointpublic Point(int x, int y){this.x=x;this.y=y;}public Point getPoint(){Point tempPont=new Point(x,y) ;return tempPoint;}public void setPoint(Point point){this.x=point.x;this.y=point.y;}public static void main(String args[]){Point Point1=new Point(3,4);System.out.println(“point1:”+”(”+Point1.x+”,”+Point1 .y+”)”); Point point2 =Point1.getPoint();System.out.println(“point2:”+”(”+Point2.x+”,”+Point2 .y+”)”); Point Point3=Point(5,6);Point1.setPoint(Point3);System.out.println(“point1:”+”(”+Point1.x+”,”+Point1 .y+”)”); }}2参考程序如下：public class Date{int year ,month,day;Date(){year=2004;month=5;day=1;}Date(int y,int m,int d){ year=y;}month=m;day=d;}int GetYear(){return year;}int GetMonth(){return month;}int GetDay(){return day;}void ShowDate(){System.out.println(year+”年”＋month＋”月”+day+”日”)；}第6章一、选择题1.C2.B3.A B4.B5.C二、填空题1.String ;StringBuffer2.{a,e,1,1}3.“acde”4.Hello! I like Java!三、判断题1.错2.错3.错4.错5.错四、程序设计题1.参考程序如下public class DeleteS{ public static void main (String args[]){//没有输入参数if (args.length==0){System.out.println(“There are no string inputted”); return ;}StringBuffer sb=new StringBuffer(args[0]);int i=0;while(I,sb.length()){if (sb.charAt(i)==’s’){sb.delete(i，i+1)；}else i++;}System.out.println(“original string ：”＋args[0]); System.out.println(“result string without ’s’: +sb”); }}2.参考程序如下;public class ReveresString{public static void main(string args[]){//没有输入参数if (args.length==0)return;}Stringbuffer sb=new Strngbuffer();String result;for(int i=(args[0].length()-1);i>=0;i-- ){sb.append(args[0].charAt(i));}result=sb.toStiring();System.out.println(“original string ：”＋args[0]); System.out.println（”Rever sed string：”＋result; }}补充：类一、单项选择题1~5 A B C C A6~10 C B D B C11~15 A C A C A16~21 A A B C D A二、多项选择题1 CD2 BCD 3CD4AB5AB6 ABC 7ABDEF8ABCDEF9ABCD10ABC三、判断题1 √2√3√4√5√6 ╳7╳8√9╳10╳全真模拟试卷一、选择题B A D B A</a.length;k++)<> </a[j])<></a.length;j++)<> </a.length-1;i++)<> </n;i++)<>。

目录第一章 Java入门 (2)第二章 Java基础 (5)第三章条件转移 (16)第四章循环语句 (22)第五章方法 (28)第六章数组 (34)第七章面向对象 (43)第八章异常 (65)第一章Java入门知识点汇总1、JAVA 三大体系⏹Java SE：（J2SE，Java2 Platform StandardEdition，标准版），三个平台中最核心的部分，包含Java最核心的类库。

⏹JavaEE：（J2EE，Java 2 Platform,Enterprise Edition，企业版），开发、装配、部署企业级应用，包含Servlet、JSP、JavaBean、JDBC、EJB、Web Service等。

⏹Java ME：（J2ME，Java 2 Platform MicroEdition，微型版），用于小型电子设备上的软件开发。

2、JDK,JRE,JVM的作用及关系作用★JVM：保证Java语言跨平台★JRE：Java程序的运行环境★JDK：Java程序的开发环境关系★JDK：JRE+工具★JRE：JVM+类库3、JDK环境变量配置⏹path环境变量：存放可执行文件的存放路径，路径之间用逗号隔开⏹classpath环境变量：类的运行路径，JVM在运行时通过classpath加载需要的类4、重点掌握两个程序⏹javac.exe：Java编译器工具，可以将编写好的Java文件（.java）编译成Java字节码文件（.class）;⏹java.exe：Java运行工具，启动Java虚拟机进程，运行编译器生成的字节码文件(.class)5、一切程序运行的入口public static void main（String args []）{System.out.println(“Hello World!”);}课堂笔记练习题一、填空题1、Java的三个技术平台分别是（J2SE）、（J2EE）、（J2ME）。

Unit 1 Never Give In, Never, Never, NeverKEY TO EXERCISESText comprehensionI. Decide which of the following best states the speaker's purpose.BII. Judge, according to the text, whether the following statements are true or false.1. T (Refer to the last sentence of Paragraph 1.)2. T (Refer to Paragraph 2.)3. F (Refer to Paragraph4. Imaginative people sometimes are pessimistic, as they see things far worse than they are and foresee more dangers than there will be.)4. F (Refer to Paragraph5. At the beginning of the German continual, intense air raids, many nations thought that Britain was finished. But to their surprise, Britain stood the ordeal and this miracle changed the view of those nations.)5. T (Refer to Paragraph 8.)III. A nswer the following questions.1. Refer to Paragraph2. Because he understands that the war is long and tough: it is not to end in months but in years. He tells the people there that however long the war lasts, the final victory belongs to Britain. But at the same time he makes it clear that not every day is an opportunity to take action: they have yet to wait and persevere.2. Refer to Paragraph3. Because he thinks that both Triumph and Disaster are deceptive in that people can make things out far worse than they really are when they have a disaster and they can lose their vigilance when they are in triumph.3. When Britain came under the heavy air attacks by Germany, many other nations thought that Britain was finished. As the country stood the ordeal to their great surprise, those nations changed their view.4. Refer to Paragraph 7. Because he has a strong conviction of victory. The two terms have different implications. When used in the text to refer to the days of war, "darker days" emphasizes the dark/negative side of the event and shows the user's pessimism. "Sterner days", though identical in its reference, suggests optimism and pride in having the chance to rise to the challenge.5. Refer to Paragraph 8. Yes, I do. By paying a visit to Harrow School and making a speech there, Churchill not only encouraged the audience of his speech but the British people in general to continue to fight rather than surrender to their enemy.IV. Explain in your own words the following sentences.1. Britain has been in too long a period of stillness without taking any particular action against the enemy.2. We are sure to experience both Triumph and Disaster, but must avoid clouding our judgment through exaggerating their importance.3. Never give in unless we are convinced that it is honourable and sensible for us to do so.4. Other nations thought that Britain was completely conquered.5. We will win as long as we hold on to the end.Structural analysis of the textIn Part 2 (Paragraphs 2?) Churchill outlined the lessons to be learned from these events and how they had proved other countries wrong about Britain. In Part 3 (Paragraphs 6?) he told the audience that he wanted to change a word in the additional verse of the school song and explained why he wanted to do it.Rhetorical features of the textThe following antonyms are used in the speech: ups -- downs, short -- long, triumph -- disaster, great -- small, large -- petty, dark days -- great days. Some of these antonyms (e.g. great -- small, large -- petty) are used to express the determination of the British people to fight on for the final victory, and some of them (e.g. dark days -- great days) are used to encourage the audience not to lose hope in the face of difficulties.Vocabulary exercisesI. Explain the underlined part in each sentence in your own words.1. gladden my heart2. situation; circumstances3. threat4. splendid; heroic5. sudden small movement because of pain or fearII. Fill in the blank(s) in each sentence with a word or phrase from the box in its appropriate form.1. put through2. addressed himself to3. was going through4. Throwing our minds back to5. yielded to6. close our account7. ups and downs8. misfortunesIII. F ill in the blanks with the appropriate forms of the given words.1. catastrophically2. deceptive3. convictions4. apparently5. Perseverance6. desperation7. unflinchingly 8. courageousIV. Choose the word that can replace the underlined part in each sentence without changing its original meaning.1. C2. D3. A4. D5. B6. A7. C8. AV. Give a synonym or an antonym of the word underlined in each sentence in the senseit is used.1. Synonym: threat (danger)2. Antonym: happy (successful)3. Synonym: position4. Synonym: seemingly5. Antonym: defeat (failure)6. Synonym: retreat (shrink, withdraw)7. Synonym: praise (commend, laud)8. Synonym: destroyVI. Explain the meaning of the underlined part in each sentence.1. current2. shown3. frequently4. depressed5. try harder6. takes inGrammar exercisesI. Improve the following sentences.1. The school teaches shorthand, bookkeeping and the use of business machines.2. The sentence is difficult to understand not because of the technical vocabulary butbecause of the faulty syntax.3. Marian could not decide whether to start college right after high school or to get a jobfirst.4. The Allies decided to invade Italy and then to launch a massive assault on theNormandy coast.5. The actor was stunned not only by the noise of booing but also by the sight of flyingtomatoes.6. Smoking cigarettes can be as dangerous as playing Russian roulette.7. The trip to the city is neither long nor expensive.8. You must either stay home or go with us.9. The course consists of several lectures, three written reports, and two impromptu oral presentations.10. The requirements for a chemistry degree are not as strict as the requirements / those for a medical degree.II. Combine the sentences in each of the following groups into one, using parallel constructions wherever possible.1. Heidi Ross was both rich and powerful.2. Most of the floggings and lynchings occur at harvest time, when fruit hangs heavy and ripe, when the leaves are red and gold, when nuts fall from the trees, when the earthoffers its best.3. I have nothing to offer but blood, toil, tears and sweat.4. Black people in America have been neglected and underestimated for years, but their recent accomplishments in a variety of fields have made "black power" real and black pride possible.5. New students will register on Monday; second-year students will register on Tuesday, and senior students will register on Wednesday.6. The actor taught his students how to read, how to stand, how to cry and how to talk with fans.7. We cannot be worried about or terrified of the difficulties in life.8. The factory workers were ready, able, and determined to do a great job.III. F ill in the blank in each sentence with the choice you think the most appropriate.1. B2. D3. D4. C5. C6. C7. A8. BIV. Combine the sentences in each group into one or two sentences. It may be necessary to change the wording or the order in which the information is presented.1. Secretaries do not want flowers but the recognition of their abilities to helpmanagement to get more done at less cost, thus contributing to profitability. They would, therefore, like to be recognized as professional coworkers.2. In Medieval times intelligent men frequently became priests. They did so to gain influential positions, for, in spite of the number of bishops from royal families, the Church was a democratic institution in which ability could make its way.3. I miss the open fire now that most houses have central heating. Central heatingprovides warmth but it does not provide a focal point in a room, which depresses me.V. Fill in the blanks with the correct forms of the verbs given.Trains have run / have been running very badly since the railway staff began a "go-slow" last month. Several times it has taken me nearly two hours to get home whereas in normal conditions it takes me half the time, and when I returned from Brighton last week the train was over three hours late. The passengers became furious that they literally screamed at the ticket collector as they left / were leaving the platform. I have never seen passengers behave like that before.VI. Make sentences of your own after the sentences given below, keeping the underlined structures in your sentences.(Reference version)1. It seems to me that I have neglected my duty.2. They are a bunch of noisy people, unbearably noisy, and we really have to think of moving.Translation exercisesI. Translate the following sentences into Chinese.1. 但我们必须学会同样善于应付短暂而干脆与漫长而艰难的局面。

Job1-11【填空题】Sun公司于年正式对外公布Java语言。

正确答案：第一空：19952【填空题】2007年11月，Google公司宣布推出基于Linux的开源智能手机操作系统，它使用Java 语言来开发应用程序,使用类似的Dalvik虚拟机来运行程序，这给了Java一个新的发展和推广机遇。

（英文单词请注意大小写，英文缩写全部大写）正确答案：第一空：Android;安卓第二空：JVM;jvm;Java虚拟机3【填空题】JVM是英文单词的缩写；JDK是英文单词的缩写，由JRE和编译、运行、调试Java应用程序的各种工具和资源包构成。

如果我们只想运行别人开发的Java程序，只需要安装即可JRE( ) 英文即可。

（英文单词之间只允许一个空格,首字母大写）正确答案：第一空：Java Virtual Machine 第二空：Java Development Kit第三空：Java Runtime Environment4【填空题】Java分为三个版本：、和。

(英文单词不加空格，注意大小写)正确答案：第一空：JavaEE 第二空：JavaME 第三空：JavaSE5【填空题】Java采用_____________和_______________合，实现了执行效率和可移植性的双重提高。

正确答案：第一空：编译第二空：解释6【填空题】Java程序运行的五个步骤：_______________、_______________、_______________、_______________、_____________。

（汉字）正确答案：第一空：编辑第二空：编译第三空：加载第四空：验证第五空：运行7【填空题】请列出Java程序的各种形态:_______________、______________、JSP/Servlet和JavaBean。

(英文单词首字母应大写)正确答案：第一空：Application 第二空：Applet8【填空题】一个Java源文件中可定义多个_____________和_____________，但public class/interface如果有的话只能定义一个，并且其类名与Java源文件名必须相同。