Java实验报告_实验一_.docx

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1、【实验名称】实验1 Java程序设计基础【实验目标】1、学习和掌握Java程序的基本结构。 2、学习和掌握Java程序的基本开发过程和方法。 3、学习和掌握程序设计的基本开发步骤。 4、学习和掌握Java程序的基本输入、输出方法。 5、学习和掌握Java程序设计的基本技.【实验日期和时间记录】2014.4.18-2014.4.26 1.创建、编译和执行Welcome.java。【实验预习】练习利用Java输出简单语句。【实验过程及结果记录】public class Welcomepublic static void main(String args)System.out.println(“Wl

2、ecome to Java！”); 2、（财务应用程序：工资单）编写程序，读入工资基本信息并打印工资单。编写两种版本的程序，依次使用控制台实现输入输出和GUI实现输入输出。运行效果可参见图1和图2。【实验预习】练习GUI输入输出，键盘输入，存在一个变量里面,整体输出。【实验过程及结果记录】控制台界面/* * (#)ComputeAndShowSolary.java * * * author * version 1.00 2014/4/12 */ import java.util.Scanner;/ public class ComputeAndShowSolary public static

3、void main(String args) /input section System.out.print(Enter employees name:);/Promt the user to enter a name Scanner input= new Scanner(System.in); String name=input.nextLine();/input the name System.out.print(Enter number of hours worked in a week:);/Promt the user to enter number of hours double

4、workhour=input.nextDouble();/input the hour System.out.print(Enter hourly pay rate:);/Promt the user to enter the rate double payrate=input.nextDouble();/input the rate System.out.print(Enter federal tax Withholding rate:);/Promt the user to enter the federal tax rate double federalrate=input.nextDo

5、uble();/input the federal tax rate System.out.print(Enter state tax Withholding rate:);/promt the user to enter the state tax rate double staterate=input.nextDouble();/inout the state tax rate /output section System.out.println(雇员姓名: +name);/output employees name System.out.println(工作小时数: +workhour)

6、;/output hours worked System.out.println(每小时工资数: +$+payrate);/output pay rate System.out.println(工资总收入: +$+payrate*workhour);/output payrate System.out.println(所纳税款:);/output Deductions System.out.println(联邦税+(+federalrate*100+%+)+: +$+workhour*payrate*federalrate); System.out.println(州税+(+staterate

7、*100+%+)+: +$+workhour*payrate*staterate); System.out.printf(总纳税: +$); System.out.printf(%.2fn,workhour*payrate*(0.2+0.09); System.out.printf(净收入: +$); System.out.printf(%.2f,workhour*payrate*(1.0-0.2-0.09); GUI界面/* * (#)ComputeAndShowSolaryWithGUI.java * * * author * version 1.00 2014/4/12 */import

8、 javax.swing.JOptionPane;public class ComputeAndShowSolaryWithGUI public static void main(String args) /input section String namestring=JOptionPane.showInputDialog(Enter employees name:); String hoursstring=JOptionPane.showInputDialog(Enter numbers of hours worked in a week:); int hours=Integer.pars

9、eInt(hoursstring); String payratestring=JOptionPane.showInputDialog(Enter hourly pay rate:); double payrate=Double.parseDouble(payratestring); String federalstring=JOptionPane.showInputDialog(Enter federal tax withholding rate:); double federal=Double.parseDouble(federalstring); String statestring=J

10、OptionPane.showInputDialog(Enter state tax withholding rate:); double state=Double.parseDouble(statestring); /output section JOptionPane.showMessageDialog(null, 雇员姓名: +namestring+ n工作小时数：+hours+ n每小时工资数：+$+payrate+ n工资总收入：+ $+payrate*hours+ n所纳税款：+ n 联邦税(20.0%):+$+hours*payrate*0.2+ n 州税(9.0%):+$+(i

11、nt)(hours*payrate*0.09*100)/100.0+ n 总纳税：+$+(int)(hours*payrate*(0.2+0.09)*100)/100.00+ n净收入：+$+(int)(hours*payrate*(1.0-0.2-0.09)*100)/100.00 ); 3、（财务应用程序：计算税款）按照表1，基于纳税人的身份和可征税收入，编写程序，计算某个纳税人的纳税额。比如，计算一个收入美元的单身纳税人的纳税额。程序的运行效果见图3。 说明：题目来源，编程练习3.13（P85）和程序清单3-6(P68)。程序设计的基本步骤，参见2.2小节（P18）和教材P84给出的教学

12、注意。解决方案的选择模型，参见授课ppt文稿。 【实验预习】练习if语句和基本运算语句【实验过程及结果记录】import java.util.Scanner;public class ComputeTax public static void main(String args) System.out.println(0-单身纳税人。1-已婚共同纳税人或证实的鳏寡，2-已婚单独纳税人，3-家庭户主纳税人); System.out.print(Enter the filing status:); Scanner input=new Scanner(System.in); int choice=in

13、put.nextInt(); System.out.print(Enter the taxable income:); double income=input.nextDouble(); double tax=0; if(0=choice) if(0=income&income=8350) tax=income*0.1; else if(8351=income&income=33950) tax=8350*0.1+(income-8350)*0.15; else if(33951=income&income=82250) tax=8350*0.1+(33950-8350)*0.15+(inco

14、me-33950)*0.25; else if(82251=income&income=) tax=8350*0.1+(33950-8350)*0.15+(82250-33950)*0.25+(income-82250)*0.28; else if(=income&income=) tax=8350*0.1+(33950-8350)*0.15+(82250-33950)*0.25+(-82250)*0.28+(income-)*0.33; else if(=income) tax=8350*0.1+(33950-8350)*0.15+(82250-33950)*0.25+(-82250)*0.

15、28+(- )*0.33+(income-)*0.35; if(1=choice) if(0=income&income=16700) tax=income*0.1; else if(16701=income&income=67900) tax=16700*0.1+(income-16700)*0.15; else if(67901=income&income=) tax=16700*0.1+(67900-16700)*0.15+(income-67900)*0.25; else if(=income&income=) tax=16700*0.1+(67900-16700)*0.15+(-67

16、900)*0.25+(income-13751)*0.28; else if(=income&income=) tax=16700*0.1+(67900-16700)*0.15+(-67900)*0.25+(-13751)*0.28+ (income-)*0.33; else if(=income) tax=16700*0.1+(67900-16700)*0.15+(-67900)*0.25+(-13750)*0.28+ (-)*0.33+(income-)*0.35; if(2=choice) if(0=income&income=8350) tax=income*0.1; else if(

17、8351=income&income=33950) tax=8350*0.1+(income-8350)*0.15; else if(33951=income&income=67525) tax=8350*0.1+(33950-8350)*0.15+(income-33950)*0.25; else if(68526=income&income=) tax=8350*0.1+(33950-8350)*0.15+(68525-33950)*0.25+(income-68525)*0.28; else if(=income&income=) tax=8350*0.1+(33950-8350)*0.

18、15+(68525-33950)*0.25+(-68525)*0.28+(income- )*0.33; else if(=income) tax=8350*0.1+(33950-8350)*0.15+(68525-33950)*0.25+(-68525)*0.28+(- )*0.33+(income-)*0.35; if(3=choice) if(0=income&income=11950) tax=income*0.1; else if(11951=income&income=45500) tax=11951*0.1+(income-11950)*0.15; else if(45501=i

19、ncome&income=) tax=11951*0.1+(45500-11950)*0.15+(income-45500)*0.25; else if(=income&income=) tax=11951*0.1+(45500-11950)*0.15+(-45500)*0.25+(income-)*0.28; else if(=income&income=) tax=11951*0.1+(45500-11950)*0.15+(-45500)*0.25+(-)*0.28+(income-)*0.33; else if(=income) tax=8350*0.1+(33950-8350)*0.1

20、5+(82250-33950)*0.25+(-82250)*0.28+(- )*0.33+(income-)*0.35; System.out.println(Tax is +tax); 4、（财务应用程序：打印税表）在问题3的基础上，使用下面的方法头部，编写一个计算税款的方法： public static double computeTax()int status,double taxableIncome) 使用这个方法编写程序，打印可征税收入从50000美元到60000美元，收入间隔50美元的所有四种纳税人的纳税表。 【实验预习】练习if语句，以及方法的使用【实验过程及结果记录】/* *

21、(#)NewComputeTax.java * * * author * version 1.00 2014/5/4 */public class NewComputeTax public static double computeTax(int status,double taxableIncome) double tax=0; double income=taxableIncome; int choice=status; if(0=choice) if(0=income&income=8350) tax=income*0.1; else if(8351=income&income=3395

22、0) tax=8350*0.1+(income-8350)*0.15; else if(33951=income&income=82250) tax=8350*0.1+(33950-8350)*0.15+(income-33950)*0.25; else if(82251=income&income=) tax=8350*0.1+(33950-8350)*0.15+(82250-33950)*0.25+(income-82250)*0.28; else if(=income&income=) tax=8350*0.1+(33950-8350)*0.15+(82250-33950)*0.25+(

23、-82250)*0.28+(income-)*0.33; else if(=income) tax=8350*0.1+(33950-8350)*0.15+(82250-33950)*0.25+(-82250)*0.28+(-)*0.33+(income-)*0.35; if(1=choice) if(0=income&income=16700) tax=income*0.1; else if(16701=income&income=67900) tax=16700*0.1+(income-16700)*0.15; else if(67901=income&income=) tax=16700*

24、0.1+(67900-16700)*0.15+(income-67900)*0.25; else if(=income&income=) tax=16700*0.1+(67900-16700)*0.15+(-67900)*0.25+(income-13751)*0.28; else if(=income&income=) tax=16700*0.1+(67900-16700)*0.15+(-67900)*0.25+(-13751)*0.28+(income-)*0.33; else if(=income) tax=16700*0.1+(67900-16700)*0.15+(-67900)*0.

25、25+(-13750)*0.28+(-)*0.33+(income-)*0.35; if(2=choice) if(0=income&income=8350) tax=income*0.1; else if(8351=income&income=33950) tax=8350*0.1+(income-8350)*0.15; else if(33951=income&income=67525) tax=8350*0.1+(33950-8350)*0.15+(income-33950)*0.25; else if(68526=income&income=) tax=8350*0.1+(33950-

26、8350)*0.15+(68525-33950)*0.25+(income-68525)*0.28; else if(=income&income=) tax=8350*0.1+(33950-8350)*0.15+(68525-33950)*0.25+(-68525)*0.28+(income-)*0.33; else if(=income) tax=8350*0.1+(33950-8350)*0.15+(68525-33950)*0.25+(-68525)*0.28+(-)*0.33+(income-)*0.35; if(3=choice) if(0=income&income=11950)

27、 tax=income*0.1; else if(11951=income&income=45500) tax=11951*0.1+(income-11950)*0.15; else if(45501=income&income=) tax=11951*0.1+(45500-11950)*0.15+(income-45500)*0.25; else if(=income&income=) tax=11951*0.1+(45500-11950)*0.15+(-45500)*0.25+(income-)*0.28; else if(=income&income=) tax=11951*0.1+(4

28、5500-11950)*0.15+(-45500)*0.25+(-)*0.28+(income-)*0.33; else if(=income) tax=8350*0.1+(33950-8350)*0.15+(82250-33950)*0.25+(-82250)*0.28+(- )*0.33+(income-)*0.35; System.out.println(choice+ +income+ +tax); return 0; public static void main(String args)for(int status=0;status4;status+)for(double inco

29、me=50000;income=60000;income+=50)computeTax(status,income); 5、（财务应用程序：计算税款）使用数组重新编写问题3的实现。使用数组表示税率： double rates = 0.10,0.15,0.25,0.28,0.33,0.35; 使用数组表示收入分段： int brackets = 8350,33950,82250, 16700,67900, 8350,33950,68525, 11950,45500, ; 【实验预习】练习数组的输入输出以及处理数组内的数据。【实验过程及结果记录】/* * (#)ComputeTaxWithArra

30、y.java * * * author * version 1.00 2014/5/4 */import java.util.Scanner;public class ComputeTaxWithArray public static void main(String args) / Create a ScannerScanner input = new Scanner(System.in);/ Prompt the user to enter filing status/ Prompt the user to enter filing statusSystem.out.print(0-sin

31、gle filer, 1-married jointly,n +2-married separately, 3-head of household)n +Enter the filing status: );int status = input.nextInt();/ Prompt the user to enter taxable incomeSystem.out.print(Enter the taxable income: );double income = input.nextDouble();/ Compute and display the resultSystem.out.pri

32、ntln(Tax is +(int)(computeTax(status, income) * 100) / 100.0);public static double computeTax(int status, double income) double rates = 0.10, 0.15, 0.25, 0.28, 0.33, 0.35;int brackets = 8350, 33950, 82250, , , / Single filer 16700, 67900, , 20885, , / Married jointly 8350, 33950, 68525, , , / Marrie

33、d separately 11950, 45500, , , / Head of household;double tax = 0; / Tax to be computed/ Compute tax in the first bracketif (income = bracketsstatus0)return tax = income * rates0; / Doneelsetax = bracketsstatus0 * rates0;/ Compute tax in the 2nd, 3rd, 4th, and 5th brackets, if neededfor (int i = 1;

34、i bracketsstatusi)tax += (bracketsstatusi - bracketsstatusi - 1) *ratesi;else tax += (income - bracketsstatusi - 1) * ratesi;return tax; / Done/ Compute tax in the last (i.e., 6th) bracketreturn tax += (income - bracketsstatus4) * rates5;【思考题】 l 你开始“每天做一点编程练习”了吗？ 已经坚持了一段时间l 在问题3的解决方案中，你使用的是哪种选择结构模型（可以使用流程图描述）？实现这个选择结构模型的java语法结构是什么？ 先判断纳税人的情况，根据纳税人情况再对其收入进行分析以确定其应缴多少的税；使用的事if选择结构l 在问题4中，你使用了哪种循环方法？为什么？ for循环；循环开始，终止条件一目了然l 你如何理解教材作者说的“如果能够使用循环编写程序，你就懂得如何编程了”？（语出教材P103） 利用循环可以简化语句，熟练地掌握编程语言l 从问题3到问题5，可以使用不同的编程技术，解决同一个问题。说说你对这个过程中的编程感受和想法？ 编程的方法是多种多样的，不可局限于某一种方法。