實(shí)驗(yàn)任務(wù)一：閱讀并運(yùn)行示例PassArray.java.

1)源代碼：

package?demo;

//PassArray.java

//Passing arrays and individual array elements to methods

public?class?PassArray {

public?static?void?main(String[] args) {

int?a[] = { 1, 2, 3, 4, 5 };

String output = "The values of the original array are:\n";

for?(int?i = 0; i < a.length; i++)

output += " ??"?+ a[i];

output += "\n\nEffects of passing array "?+ "element call-by-value:\n"

+ "a[3] before modifyElement: "?+ a[3];

modifyElement(a[3]);

output += "\na[3] after modifyElement: "?+ a[3];

output += "\n Effects of passing entire array by reference";

modifyArray(a); // array a passed call-by-reference

output += "\n\nThe values of the modified array are:\n";

for?(int?i = 0; i < a.length; i++)

output += " ??"?+ a[i];

System.out.println(output);

}

public?static?void?modifyArray(int?b[]) {

for?(int?j = 0; j < b.length; j++)

b[j] *= 2;

}

public?static?void?modifyElement(int?e) {

e *= 2;

}

}

2)程序截圖:

使用引用傳遞時(shí)，方法中更改了數(shù)組元素的值，直接修改了原始的數(shù)組元素。 使用值傳遞時(shí)，方法體中修改的僅是原始數(shù)組元素的一個(gè)拷貝。

實(shí)驗(yàn)任務(wù)二：閱讀QiPan.java示例程序了解如何利用二維數(shù)組和循環(huán)語句繪制五子棋盤。

源代碼：

package?demo;

import?java.io.*;

public?class?QiPan

{

//定義一個(gè)二維數(shù)組來充當(dāng)棋盤

private?String[][] board;

//定義棋盤的大小

private?static?int?BOARD_SIZE?= 15;

public?void?initBoard()

{

//初始化棋盤數(shù)組

board?= new?String[BOARD_SIZE][BOARD_SIZE];

//把每個(gè)元素賦為"╋"，用于在控制臺(tái)輸出棋盤

for?(int?i = 0 ; i < BOARD_SIZE?; i++)

{

for?( int?j = 0 ; j < BOARD_SIZE?; j++)

{

board[i][j] = "╋";

}

}

}

//在控制臺(tái)輸出棋盤的方法

public?void?printBoard()

{

//打印每個(gè)數(shù)組元素

for?(int?i = 0 ; i < BOARD_SIZE?; i++)

{

for?( int?j = 0 ; j < BOARD_SIZE?; j++)

{

//打印數(shù)組元素后不換行

System.out.print(board[i][j]);

}

//每打印完一行數(shù)組元素后輸出一個(gè)換行符

System.out.print("\n");

}

}

public?static?void?main(String[] args)throws?Exception

{

QiPan gb = new?QiPan();

gb.initBoard();

gb.printBoard();

//這是用于獲取鍵盤輸入的方法

BufferedReader br = new?BufferedReader(new?InputStreamReader(System.in));

String inputStr = null;

System.out.println("請(qǐng)輸入您下棋的座標(biāo)，應(yīng)以x,y的格式：");

//br.readLine()：每當(dāng)在鍵盤上輸入一行內(nèi)容按回車，剛輸入的內(nèi)容將被br讀取到。

while?((inputStr = br.readLine()) != null)

{

//將用戶輸入的字符串以逗號(hào)(,)作為分隔符，分隔成2個(gè)字符串

String[] posStrArr = inputStr.split(",");

//將2個(gè)字符串轉(zhuǎn)換成用戶下棋的座標(biāo)

int?xPos = Integer.parseInt(posStrArr[0]);

int?yPos = Integer.parseInt(posStrArr[1]);

//把對(duì)應(yīng)的數(shù)組元素賦為"●"。

gb.board[xPos - 1][yPos - 1] = "●";

/*

電腦隨機(jī)生成2個(gè)整數(shù)，作為電腦下棋的座標(biāo)，賦給board數(shù)組。

還涉及

1.座標(biāo)的有效性，只能是數(shù)字，不能超出棋盤范圍

2.如果下的棋的點(diǎn)，不能重復(fù)下棋。

3.每次下棋后，需要掃描誰贏了

*/

gb.printBoard();

System.out.println("請(qǐng)輸入您下棋的座標(biāo)，應(yīng)以x,y的格式：");

}

}

}

1)實(shí)驗(yàn)結(jié)果截圖：

實(shí)驗(yàn)任務(wù)三：請(qǐng)編寫一個(gè)程序?qū)⒁粋€(gè)整數(shù)轉(zhuǎn)換為漢字讀法字符串。比如“1123”轉(zhuǎn)換為“一千一百二十三”。 更進(jìn)一步，能否將數(shù)字表示的金額改為“漢字表達(dá)？ 比如將“￥123.52”轉(zhuǎn)換為“壹佰貳拾叁元伍角貳分”。

1)程序設(shè)計(jì)思想:

2)源代碼：

package?demo;

import?java.util.Scanner;

public?class?ZhuanHuan {

private?String[] a={"零","壹","貳","叁","肆","伍","陸","柒","捌","玖"};

private?String[] b={"十","百","千","萬","十萬?","百萬"};

private?String[] c={"元","角","分"};

private?String Change(String str)

{

String result="";

int?numLen=str.length();

for(int?i=0;i

{

int?num=str.charAt(i)-48;

if(i!=numLen-1&&num!=0)

{

result+=a[num]+b[numLen-2-i];

}

else

{

if(result.length()>0&&a[num].equals("零")&&result.charAt(result.length()-1)=='零')

continue;

result+=a[num];

}

}

if(result.length()==1)

return?result;

int?index=result.length()-1;

while(result.charAt(index)=='零')

{

index--;

}

if(index!=result.length()-1)

return?result.substring(0,index+1);

else?{

return?result;

}

}

public?static?void?main(String args[])

{

ZhuanHuan nr=new?ZhuanHuan();

Scanner in=new?Scanner(System.in);

System.out.print("輸入整數(shù):");

String x=in.next();

System.out.print("轉(zhuǎn)換后為:"+nr.Change(x));

}

}

進(jìn)一步，金額的源代碼：

package?demo;

import?java.util.Scanner;

public?class?ZhuanHuan {

private?String[] a={"零","壹","貳","叁","肆","伍","陸","柒","捌","玖"};

private?String[] b={"十","百","千","萬"};

private?String[] c={"元","角","分"};

private?String Change(String str)

{

String result="";

int?p=0;

int?numLen=str.length();

for(int?i=0;i

{

if(str.charAt(i)=='.')

{

p=i;

break;

}

}

for(int?i=0;i

int?num=str.charAt(i)-48;

if(i!=p-1&&num!=0)

{

result+=a[num]+b[p-2-i];

}

else

{

if(result.length()>0&&a[num].equals("零")&&result.charAt(result.length()-1)=='零')

continue;

result+=a[num];

}

}

result+=c[0];

for(int?i=p+1;i

{

int?num1=str.charAt(i)-48;

if(num1!=0)

{

result+=a[num1]+c[numLen-p-2];

}

else

result+=a[num1];

p--;

}

int?index=result.length()-1;

while(result.charAt(index)=='零')

{

index--;

}

if(index!=result.length()-1)

return?result.substring(0,index+1);

else?{

return?result;

}

}

public?static?void?main(String args[])

{

ZhuanHuan nr=new?ZhuanHuan();

Scanner in=new?Scanner(System.in);

System.out.print("輸入金額:");

String x=in.next();

System.out.print("轉(zhuǎn)換后為:"+nr.Change(x));

}

}

4)實(shí)驗(yàn)結(jié)果截圖：

實(shí)驗(yàn)任務(wù)四：大數(shù)

(1)?源代碼：

package?demo;

import?java.util.Scanner;

public?class?BigNum{

public?static?int[]add(int?[]a,int?[]b){

int?wei=0;

int[]c=new?int[a.length];

for(int?i=a.length-1;i>=0;i--)

{

c[i]=a[i]+b[i]+wei;

if(c[i]<10)

wei=0;

else

{

c[i]=c[i]-10;

wei=1;

}

}

return?c;

}

public?static?int?[]sub(int?[]a,int[]b,int?w)

{

int?wei=0;

int[]c=new?int[a.length];

for(int?i=a.length-1;i>=0;i--)

{

if(w<=0)

{

c[i]=b[i]-a[i]-wei;

if(c[i]>=0)

{ ??wei=0;}

else

{

c[i]=c[i]+10;

wei=1;

}

}

else

{

c[i]=a[i]-b[i]-wei;

if(c[i]>=0)

{wei=0;}

else

{

c[i]=c[i]+10;

wei=1;

}

}

}

return?c;

}

public?static?void?main(String[]args){

int?a[]=new?int[100];

int?b[]=new?int[100];

int?m=0;

int?n=0;

int?s=0;

int?t=0;int?u=0;

Scanner in=new?Scanner(System.in);

System.out.println("請(qǐng)輸入第一個(gè)數(shù):");

String aa=in.next();

System.out.println("請(qǐng)輸入第二個(gè)數(shù):");

String bb=in.next();

m=a.length-aa.length();

n=b.length-bb.length();

if(aa.length()>bb.length())

{

u=1;

}

else?if?(aa.length()

{

u=-1;

}

else

{u = aa.compareTo(bb);}

for?(int?i = 0; i < aa.length(); i++)

{

a[m++] = aa.charAt(i) - 48;

}

for?(int?j = 0; j < bb.length(); j++)

{

b[n++] = bb.charAt(j) - 48;

}

int[] c = BigNum.add(a, b);

for?(int?k = 0; k < c.length; k++)

{

if?(c[k] > 0)

{

s = k;

break;

}

}

System.out.print("相加的結(jié)果為：");

for?(int?i = s; i < c.length; i++) {

System.out.print(c[i]);

}

System.out.println();

int[] d = BigNum.sub(a, b, u);

for?(int?k = 0; k < d.length; k++)

{

if?(d[k] > 0)

{

t = k;

break;

}

}

System.out.print("相減的結(jié)果為：");

if?(u < 0)

System.out.print("-");

for?(int?i = t; i < d.length; i++)

{

System.out.print(d[i]);

}

System.out.println();

System.out.println();

System.out.println();

System.out.println();

}

}

(2)?程序截圖

實(shí)驗(yàn)任務(wù)五：隨機(jī)生成10個(gè)數(shù)，填充一個(gè)數(shù)組，然后用消息框顯示數(shù)組內(nèi)容，接著計(jì)算數(shù)組元素的和，將結(jié)果也顯示在消息框中。

(1)?程序設(shè)計(jì)思路：先定義一個(gè)數(shù)組，用random算法產(chǎn)生隨機(jī)數(shù)，利用for循環(huán)將隨機(jī)數(shù)導(dǎo)入數(shù)組中，遍歷計(jì)算數(shù)組元素的和，然后輸出即可。

(2)?源代碼：

package?demo;

import?javax.swing.JOptionPane;

public?class?ArrayAdd {

public?static?void?main(String args[]){

int?[]a=new?int[10];

int?sum=0;

String str="10個(gè)隨機(jī)數(shù)為:"+"\n";

for(int?i=0;i

{

int?m=(int)(Math.random()*100);

a[i]=m;

str+=a[i]+"\n";

sum+=a[i];

}

str+="隨機(jī)數(shù)的和為:"+sum;

JOptionPane.showMessageDialog(null,str,"結(jié)果",JOptionPane.INFORMATION_MESSAGE);

}

}

程序截圖：

(5)編程總結(jié)：學(xué)會(huì)了利用循環(huán)將隨機(jī)數(shù)賦給數(shù)組，然后計(jì)算數(shù)組元素的和，遍歷并輸出，把問題從大化小，由繁化簡，逐步分析，完成項(xiàng)目。

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