南昌大学Java实验报告2.docx

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1、 南昌大学实验报告学生姓名： 学 号： 专业班级： 实训类型： 验证 综合 设计 创新 实验日期：2017.11.8 实验成绩：一、 实验项目名称字符串和数组二、 实验的评分标准实验分为AF，A为最高，F最低。F：在规定时间内没有完成所有的实验，而且没有及时提交实验报告，或者实验过程中出现了抄袭复制他人实验代码。D：能完成实验，但是实验结果出现严重错误，不能体现对教学内容的理解。C：能基本完成实验，实验结果基本正确。但是实验内容有较少的错误，提交的实验代码质量一般。B：能较好的完成实验，实验报告条理清楚，实验代码结构清晰，代码质量较高，及时更正试验中出现的错误，并对运行中一些异常错误进行分析，

2、解释错误产生的原因。A：能较好的完成实验，实验代码质量高，实验报告完成度高，能在实验完成的基础上，根据个人的理解增加实验的新功能，具有一定的创新能力。三、 实验目的和要求1. 掌握java的基础知识。2. 掌握和运用java的控制语句和数组。3. 掌握和运用java的字符串。四、 实验内容1.使用BigInteger计算超大整数的问题。2.结合字符串和数组计算超大整数的问题这里，我模仿Math写了专门计算数组形式存放整数的一个工具类（见后面源代码），只有静态函数，想来挑战Biginteger类。在循环体计算前后，分别用时间函数获取系统当前时间，作差来近似等价于核心运算时间。Biginteger

3、类耗时1ms，自己写的方法耗时13ms，相差13倍，惨败。3. 字符串的“=”和equals()方法。详细结果解释在源代码注释中给出。4. 统计英文单词5.用StringBuffer模拟扑克牌洗牌6.数独游戏Clear:清除用户输入的所有数据Restart：开始新的数独游戏Check：检查用户输入数据的正确性提示框用户输入的数字显示蓝色，已知的数字显示黑色为增加可判断性，做出了灰色阴影效果7. 财务应用程序，比较不同利率下的贷款。8. 财务应用程序，信用卡号的合法性实验源代码如下：1. 使用Biginteger计算大数package one;import java.math.BigIntege

4、r;public class BigintegerCal public static void main(String args) BigInteger res = new BigInteger(1); BigInteger b = new BigInteger(1); long start = System.currentTimeMillis(); for(int i = 1;i=100;i+) b = b.multiply(new BigInteger(2); res = res.multiply(b.add(BigInteger.ONE); long end = System.curre

5、ntTimeMillis(); System.out.println(res.toString(); System.out.println(After + (end-start) + ms);2. 字符串或数组计算大数=part1=package two;* this class is designed to offer tools to calculate* huge integer numbers via plain integer arraypublic class ArrayCal private ArrayCal(); /*array a multiply array b*/ pub

6、lic static int mul(int a,int b) int res = new inta.length + b.length; for(int i = 0;i=0;-i) for(int j = a.length-1;j=0;-j) tmp += (resj+i+1 + aj*bi); resj+i+1 = tmp %10; tmp /= 10; resi = tmp; tmp = 0; return ArrayCal.clean(res); /*array a add a single integer*/ public static int add(int a,int num)

7、int res = new inta.length+1; for(int i = a.length-1;i=0;i-) num = ai +num; resi+1 = num % 10; num /= 10; res0 = num; return ArrayCal.clean(res); /* array a multiply a single integer*/ public static int mul(int a,int num) int res = new inta.length+1; int c = 0;/pre for(int i = a.length-1;i=0;i-) c =

8、ai * num + c; resi+1 = c %10; c /= 10; res0 = c; return ArrayCal.clean(res); /*clean the redundant 0 in the front of the array*/ public static int clean(int a) if(a0!=0) return a; else int count = 0; for(int i = 0;ia.length & ai=0;+i) count+; int res = new inta.length - count; System.arraycopy(a,cou

9、nt,res,0,a.length-count); return res;=part2=package two;public class Calculate public static void main(String args) int part2 = 1; int part1; int res = 1; long start = System.currentTimeMillis(); for(int i = 1;i0 for more ,0 for less System.out.println(4.+ pareTo(three); /same as 2 System.out.printl

10、n(5.+one.intern() = three.intern(); 4.统计英文单词package four;import java.util.ArrayList;import java.util.Scanner;public class CountWord public static void main(String args) Scanner input = new Scanner(System.in); ArrayList list = new ArrayList(); System.out.println(Please input an English sentence,seper

11、ated by blank:); String data = input.nextLine(); int count = new intdata.length(); /split the string inputted by the user with / making it String String dataNew = data.split( ); for(String e:dataNew) if(!list.contains(e) list.add(e); countlist.size()-1+; else countlist.indexOf(e)+; int max = count0;

12、 int index = 0; for(int i = 1;imax) max = counti; index = i; System.out.println(The word with the most appearance time: + dataNewindex); System.out.println(The times of its appearance: + max);5. StringBuffer模拟扑克牌洗牌=part1=package five;* the class is designed to create the basic Poke model* in which u

13、ser can shuffle it ,display the cardsclass Poke private char type = ,;private String value = 3 ,4 ,5 ,6 ,7 ,8 ,9 ,10,J ,Q ,K ,A ,2 ;private StringBuffer cards = new StringBuffer();public Poke() for(char x : type)for(String y : value) this.cards.append(x+y);void shuffle(int times) for(int i=0;i= 3 &

14、(len-1 -right)/3 = 3) /the amount of cards to be shuffled at random on each side(13)numOfL = (int)(Math.random()*3+1);numOfR = (int)(Math.random()*3+1);temp.append(cards.substring(left-numOfL*3, left);temp.append(cards.substring(right, right+numOfR*3);left -= numOfL*3;right += numOfR*3;/less than 3

15、cards in each side,put them all in the new stringif(left!=0)temp.append(cards.substring(0, left);if(right!=len-1)temp.append(cards.substring(right, len);cards = temp;/renew the original cards/shuffle finishedvoid showCards() for(int i = 0;i52;i+) if(i+13)%13=0)System.out.println();System.out.print(c

16、ards.substring(3*i, 3*i+3)+ );System.out.println();=part2=package five;public class Shuffle public static void main(String args) Poke poke = new Poke(); poke.shuffle(4);/shuffle for 4 times poke.showCards();6. 数独游戏=part1=package six;import java.util.Arrays;/*this class is designed to generate one so

17、lution of Sudo,to mask several numbers at random in all 81 numbers to raise a Sudo problem,to define the rules to check whether the numbers inputted by user are correct */public class Sudo private int solution; /initialize the sudoku according to /-the regularity of the sum of i and j public Sudo()

18、solution = new int9; for(int i = 0;i9;i+) solutioni = new int9; for(int j = 1;j9)?(i+j-9):i+j; martrix(); colSwap(); mask(); /return a concrete and random solution public int getDigit(int i,int j) return solutionij; /construct a situation object to the sudoku rules /by extracting the line147,258,369

19、 from the solution private void martrix() int temp = new int99; for(int i = 0,j = 0;i3;i+) tempj+ = Arrays.copyOf(solutioni,solutioni.length); tempj+ = Arrays.copyOf(solutioni+3,solutioni+3.length); tempj+ = Arrays.copyOf(solutioni+6,solutioni+6.length); solution = temp; /based on the123,456,789 col

20、umn group /swap each column value among each group private void colSwap() int colForSwap= 0; int temp = new int9; for(int i = 0;i9;i+) switch(i) /choose the column to swap case 0: case 1: case 2: colForSwap = (int)(Math.random()*3); break;/group1 case 3: case 4: case 5: colForSwap = (int)(Math.rando

21、m()*3 + 3); break;/group2 case 6: case 7: case 8: colForSwap = (int)(Math.random()*3 + 6);/group3 if(colForSwap!=i) for(int j = 0;j9;j+) /j for line tempj = solutionjcolForSwap; /the same column,diffent line solutionjcolForSwap = solutionji; solutionji = tempj; /finish one-column swap /finish all-co

22、lumns swap private void mask() /choose the value masked at random for(int i = 0;i9;+i) for(int j = 0;j9;j+) int difficulty = (int)(Math.random()*2); /0 or 1 if(difficulty=0) solutionij = 0; private boolean lineVlid(int i,int j,int value) for(int m = 0;m9 & m != j;m+) if(solutionim = value) return fa

23、lse; return true; private boolean colValid(int i,int j,int value) for(int n = 0;n9 & n!=i;n+) if(solutionnj = value) return false; return true; private boolean recValid(int i,int j,int value) for(int m = 3*(i/3);m=3*(i/3)+2;+m) for(int n = 3*(j/3);n0 & value10) return (lineVlid(i,j,value)&colValid(i

24、,j,value)&recValid(i,j,value); else return false; =part2=package six;import javafx.geometry.Insets;import javafx.geometry.Pos;import javafx.scene.control.Button;import javafx.scene.control.TextField;import javafx.scene.layout.BorderPane;import javafx.scene.layout.GridPane;import javafx.scene.text.Fo

25、nt;import javafx.scene.text.FontWeight;/*this class is designed to add UI elements of the plain Sudo gamedefine the simple rules of the users operation on uiand the layout of all these elements */public class SudoUI private Sudo rule; private Font fontButton; private Font fontDigit; private GridPane

26、 board; private GridPane infoCenter; private BorderPane frame; private TextField result; private Button control; private TextField grid; public SudoUI() this.rule = new Sudo(); this.infoCenter = new GridPane(); this.board = new GridPane(); this.frame = new BorderPane(); this.grid = new TextField81;

27、this.result = new TextField(); this.control = new Button4; this.fontButton = Font.font(null, FontWeight.NORMAL,20); this.fontDigit = Font.font(null, FontWeight.BOLD,30); public void init() result.setPrefSize(150,40); result.setEditable(false); result.setAlignment(Pos.CENTER); control0 = new Button(C

28、lear); control1 = new Button(Restart); control2 = new Button(Quit); control3 = new Button(Check); for(int i = 0;i4;+i) controli.setPrefSize(150,40); controli.setFont(fontButton); control2.setStyle(-fx-background-color:rgba(230,0,0);); control0.setStyle(-fx-background-color:orangered;); control1.setS

29、tyle(-fx-background-color:rgba(0,230,0);); control3.setStyle(-fx-background-color:rgba(72,118,255);); /set the property of all the textfields for(int i = 0;i81;+i) gridi = new TextField(); gridi.setPrefSize(60,60); gridi.setFont(fontDigit); gridi.setAlignment(Pos.CENTER); public void load() for(int

30、i = 0;i81;+i) board.add(gridi,i/9,i%9); for(int i = 0;i4;+i) infoCenter.add(controli,0,i); infoCenter.setVgap(30); infoCenter.add(result,0,7); board.setGridLinesVisible(true); frame.setRight(infoCenter); frame.setCenter(board); BorderPane.setMargin(infoCenter,new Insets(40,20,0,0); public BorderPane

31、 getFrame() return frame; public Button getControl(int i) return controli; public void setGame() for(int i = 0;i9;+i) for(int j = 0;j9;+j) /set the different color in textfilds ,hence,the borders /of 9 squares are clearer boolean isGray = i/3=0&j/3=0 | i/3=0&j/3=2 | i/3=1&j/3=1 | i/3=2&j/3=0 | i/3=2

32、&j/3=2; int content = rule.getDigit(i,j); if(content!=0 & isGray) gridi*9+j.setEditable(false); gridi*9+j.setStyle(-fx-background-color: lightgray;); gridi*9+j.setText(String.valueOf(content); else if(content = 0 & isGray) /for user to fill in gridi*9+j.setEditable(true); gridi*9+j.setText(); gridi*9+j.setStyle(-fx-background-color: lightgray;-fx-text-fill:blue;); else if(content = 0 & !i