java習題,java試題及答案

本文目錄一覽：

1、Java 習題
2、JAVA 練習題
3、java練習題求完整代碼
4、java習題

Java 習題

jdk自帶工具箱中的javac.exe文件用於編譯滿足java編程規範的.java文件

第2題問的有問題，編譯完成後生成的應該是文件，而不是程序，生成的文件名應該根據所編譯的文件內的類的命名決定，因此這道題目沒法回答，不過行業內的規範是一個java文件中只定義一個公共類，也就是和文件名一樣的類，所以實在要選就只能選C了

jdk自帶工具箱中的java.exe文件用於解釋執行滿足java編程規範的並且編譯完成的.class文件

applet小應用程序的執行方式就是appletviewer

網頁格式文件，根據題設只能選d

所有的java文件編譯完成後將生成對應類名定義的字節碼文件，該文件不依附與任何操作平台，只要java虛擬機可以運行，都可以正常的執行。

JDK

Java開發工具包,Java

Development

Kit

裡面有運行環境JRE和開發時所需要的Java類庫，以及一些編譯調試運行的程序，如java.exe,javac.exe,javaw.exe等。

JAVA 練習題

public class JavaExos {

public static void charInt(String chaine){ //1044

String[] charInt = new String[2];

int count = -1;

char maxChar = ‘A’;

int[] letterCount = new int[26];

String word = chaine.toLowerCase();

for (int i=0;iword.length();i++) {

int indexOfChar = (byte)word.charAt(i)-97;

letterCount[indexOfChar]++;

if (letterCount[indexOfChar]count || (letterCount[indexOfChar]==count word.charAt(i)maxChar)){

count = letterCount[indexOfChar];

maxChar = word.charAt(i);

}

charInt[0] = String.valueOf(maxChar);

charInt[1] = “”+count;

System.out.println(charInt[0]+” “+charInt[1]);

}

public static void getDate(int n){ //1047 這題如果給1,其實是指2000年1月2號.

n++;

int[] getYear = getYear(n);

int year = getYear[0];

int[] getMonth = getMonth(year,getYear[1]);

int month = getMonth[0];

String monthString ;

if(month10) monthString = “0”+String.valueOf(month);

else monthString = String.valueOf(month);

int day = getMonth[1];

System.out.println(year+”-“+monthString+”-“+day+” “+getDayOfWeek(n));

}

private static boolean isBissextile(int n){

if (n%4==0 !(n%100==0n%400!=0))

return true;

else

return false;

}

private static int[] getYear(int n){

int[] getYear = new int[2];

int year = 2000;

while(n0){

if(isBissextile(year)) n -= 366;

else n -= 365;

if (n0) year++;

}

if(isBissextile(year)) n+=366;

else n += 365;

getYear[0] = year;

getYear[1] = n;

return getYear;

}

private static int[] getMonth(int year, int n){

int[] getMonth = new int[2];

int month = 1;

while(n0){

if(month=7 month%2 != 0) n -= 31;

else if (month==2 isBissextile(year) ) n -= 29;

else if (month==2 !isBissextile(year)) n -= 28;

else if(month=7 month%2==0) n -= 30;

else if(month%2==0) n-=31;

else n -= 30;

if (n0) month++;

}

if(month=7 month%2 != 0) n += 31;

else if (isBissextile(year) month==2) n += 29;

else if (!isBissextile(year) month==2) n += 28;

else if(month=7 month%2==0) n += 30;

else if(month%2==0) n+=31;

else n += 30;

getMonth[0] = month;

getMonth[1] = n;

return getMonth;

}

private static String getDayOfWeek(int n){

int quotient = n/7;

int remainder = n -= quotient*7;

switch(remainder){

case 0 : return “Sunday”;

case 1 : return “Monday”;

case 2 : return “Tuesday”;

case 3 : return “Wednesday”;

case 4 : return “Thursday”;

case 5 : return “Friday”;

case 6 : return “Saturday”;

default : return “Never arrive”;

}

public static void getCode(String chaine){ //1048

chaine = chaine.toUpperCase();

System.out.println(“START”);

System.out.println(chaine);

System.out.println(“END”);

System.out.println();

for(int i=0;ichaine.length();i++){

System.out.print((changChar(chaine.charAt(i))));

}

System.out.println();

}

private static char changChar(char c){

if(c=65 c=90 c-565) return (char)(c+26-5);

else if(c=65 c=90) return (char)(c-5);

else return c;

}

/**

* @param args

public static void main(String[] args) {

// TODO Auto-generated method stub

JavaExos.charInt(“adfadffasdfda”);

JavaExos.getDate(1751);

JavaExos.getCode(“NS BFW, JAJSYX TK NRUTWYFSHJ FWJ YMJ WJXZQY TK YWNANFQ HFZXJX”);

java練習題求完整代碼

按照題目要求編寫的用javaBean規範設計的學生類Student的Java程序如下

需要創建user.java.test包,把Student.java文件和Test.java文件放入包中,編譯Student.java文件並且編譯運行Test.java文件得到運行結果

Student.java文件代碼如下

package user.java.test;

import java.io.Serializable;

public class Student implements Serializable{

private static final long serialVersionUID = 1L;

private String no;

private String name;

private double score;

public Student(){}

public Student(String no,String name,double score){

this.no=no;

this.name=name;

this.score=score;

}

public String getNo(){ return no;}

public void setNo(String no){ this.no=no;}

public String getName(){ return name;}

public void setName(String name){ this.name=name;}

public double getScore(){ return score;}

public void setScore(double score){ this.score=score;}

public String toString(){

return “學號:”+no+”,姓名:”+name+”,成績:”+score;

}

public static double getAvg(Student[] sArray){

double sum=0,avg;

for(int i=0;isArray.length;i++){

sum=sum+sArray[i].getScore();

}

avg=sum/sArray.length;

return avg;

}

Test.java文件代碼如下

package user.java.test;

public class Test{

public static void main(String[] args){

Student[] sArray=new Student[5];

sArray[0]=new Student(“001″,”張三”,89.5);

sArray[1]=new Student(“002″,”李四”,82.5);

sArray[2]=new Student(“003″,”王五”,93);

sArray[3]=new Student(“004″,”趙六”,73.5);

sArray[4]=new Student(“005″,”孫七”,66);

System.out.println(“這些學生的平均分:”+Student.getAvg(sArray));

for(int i=0;isArray.length;i++){

System.out.println(sArray[i].toString());

}

java習題

import javax.swing.*;

import javax.swing.event.*;

import java.awt.*;

import java.awt.event.*;

public class calculator extends JFrame implements ActionListener

{

JFrame frame;

private JButton jia=new JButton(“+”);

private JButton jian=new JButton(“-“);

private JButton cheng=new JButton(“*”);

private JButton chu=new JButton(“/”);

private JButton qiuyi=new JButton(“%”);

private JButton deng=new JButton(“=”);

private JButton fu=new JButton(“+/-“);

private JButton dian=new JButton(“.”);

private JButton kai=new JButton(“sqrt”);

private JButton diao=new JButton(“1/x”);

private JButton aa=new JButton(“A”);

private JButton bb=new JButton(“B”);

private JButton cc=new JButton(“C”);

private JButton dd=new JButton(“D”);

private JButton ee=new JButton(“E”);

private JButton ff=new JButton(“F”);

private TextField k1=new TextField();

private objConversion convert = new objConversion();

JMenuItem copy,paste,s,t,help,about,me;

JRadioButton sixteen,ten,eight,two;

JButton backspace,ce,c,num0,num1,num2,num3,num4,num5,num6,num7,num8,num9;

Container cp;

JTextField text;

String copycontent=””;

boolean clickable=true,clear=true;

int all=0;

double qian;

String fuhao;

int jin=10,first=1;

public calculator()

{

setTitle(“計算器－楊彩製作”);

setSize(400,300);

setLocation(250,200);

text=new JTextField(25);

// text.setEnabled(false);

text.setText(“0.”);

text.setHorizontalAlignment(JTextField.RIGHT);//從右到左

JPanel cp1=new JPanel();

JPanel cp2=new JPanel();

JPanel cp3=new JPanel();

cp=getContentPane();

cp.add(cp1,”North”);

cp.add(cp2,”Center”);

cp.add(cp3,”South”);

cp1.setLayout(new GridLayout(1,6));

cp2.setLayout(new GridLayout(2,4));

cp3.setLayout(new GridLayout(6,6));

sixteen=new JRadioButton(“十六進制”);

sixteen.setVisible(false);

ten=new JRadioButton(“十進制”,true);

ten.setVisible(false);

eight=new JRadioButton(“八進制”);

eight.setVisible(false);

two=new JRadioButton(“二進制”);

two.setVisible(false);

sixteen.addActionListener(this);

ten.addActionListener(this);

eight.addActionListener(this);

two.addActionListener(this);

ButtonGroup btg=new ButtonGroup();

btg.add(sixteen);

btg.add(ten);

btg.add(eight);

btg.add(two);

JTextField t3=new JTextField(25);

cp1.add(text);

// text.setEnabled(false);

text.setEditable(false);

text.setBackground(new Color(255, 255, 255));

cp2.add(sixteen);

cp2.add(ten);

cp2.add(eight);

cp2.add(two);

backspace=new JButton(“Backspace”);

backspace.setForeground(new Color(255,0,0));

backspace.addActionListener(this);

ce=new JButton(“CE”);

ce.setForeground(new Color(255,0,0));

ce.addActionListener(this);

c=new JButton(“C”);

c.setForeground(new Color(255,0,0));

c.addActionListener(this);

k1.setVisible(false);

cp2.add(k1);

cp2.add(backspace);

cp2.add(ce);

cp2.add(c);

num0=new JButton(“0”);

num1=new JButton(“1”);

num2=new JButton(“2”);

num3=new JButton(“3”);

num4=new JButton(“4”);

num5=new JButton(“5”);

num6=new JButton(“6”);

num7=new JButton(“7”);

num8=new JButton(“8”);

num9=new JButton(“9”);

cp3.add(num7);

num7.addActionListener(this);

cp3.add(num8);

num8.addActionListener(this);

cp3.add(num9);

num9.addActionListener(this);

cp3.add(chu);

chu.setForeground(new Color(255,0,0));

chu.addActionListener(this);

cp3.add(kai);

kai.addActionListener(this);

cp3.add(num4);

num4.addActionListener(this);

cp3.add(num5);

num5.addActionListener(this);

cp3.add(num6);

num6.addActionListener(this);

cp3.add(cheng);

cheng.setForeground(new Color(255,0,0));

cheng.addActionListener(this);

cp3.add(qiuyi);

qiuyi.addActionListener(this);

cp3.add(num1);

num1.addActionListener(this);

cp3.add(num2);

num2.addActionListener(this);

cp3.add(num3);

num3.addActionListener(this);

cp3.add(jian);

jian.setForeground(new Color(255,0,0));

jian.addActionListener(this);

cp3.add(diao);

diao.addActionListener(this);

cp3.add(num0);

num0.addActionListener(this);

cp3.add(fu);

fu.addActionListener(this);

cp3.add(dian);

dian.addActionListener(this);

cp3.add(jia);

jia.setForeground(new Color(255,0,0));

jia.addActionListener(this);

cp3.add(deng);

deng.setForeground(new Color(255,0,0));

deng.addActionListener(this);

cp3.add(aa);

aa.addActionListener(this);

cp3.add(bb);

bb.addActionListener(this);

cp3.add(cc);

cc.addActionListener(this);

cp3.add(dd);

dd.addActionListener(this);

cp3.add(ee);

ee.addActionListener(this);

cp3.add(ff);

ff.addActionListener(this);

aa.setVisible(false);

bb.setVisible(false);

cc.setVisible(false);

dd.setVisible(false);

ee.setVisible(false);

ff.setVisible(false);

JMenuBar mainMenu = new JMenuBar();

setJMenuBar(mainMenu);

JMenu editMenu = new JMenu(“編輯”);

JMenu viewMenu = new JMenu(“查看”);

JMenu helpMenu = new JMenu(“幫助”);

mainMenu.add(editMenu);

mainMenu.add(viewMenu);

mainMenu.add(helpMenu);

copy = new JMenuItem(” 複製”);

paste = new JMenuItem(” 粘貼”);

KeyStroke copyks=KeyStroke.getKeyStroke(KeyEvent.VK_C,Event.CTRL_MASK);

copy.setAccelerator(copyks);//設置退出菜單選項加上快捷鍵

KeyStroke pasteks=KeyStroke.getKeyStroke(KeyEvent.VK_V,Event.CTRL_MASK);

paste.setAccelerator(pasteks);//設置退出菜單選項加上快捷鍵

editMenu.add(copy);

editMenu.add(paste);

copy.addActionListener(this);

paste.addActionListener(this);

t = new JMenuItem(“●標準型”);

s = new JMenuItem(” 科學型”);

viewMenu.add(t);

viewMenu.add(s);

t.addActionListener(this);

s.addActionListener(this);

help = new JMenuItem(” 幫助主題”);

about = new JMenuItem(” 關於計算器”);

me = new JMenuItem(” 作者主頁”);

helpMenu.add(help);

helpMenu.add(about);

helpMenu.add(me);

help.addActionListener(this);

about.addActionListener(this);

me.addActionListener(this);

addWindowListener(new WindowDestroyer());//結束窗口

}

public void actionPerformed(ActionEvent e)

{//響應動作代碼

if(first==1)

text.setText(“”);

first=0;//第一次把文本框0.清空

Object temp = e.getSource();

if(temp==copy)

{

copycontent = text.getText();

}

if(temp==paste)

{

text.setText(text.getText()+copycontent);

}

if(temp==t)

{//標準

sixteen.setVisible(false);

ten.setVisible(false);

eight.setVisible(false);

two.setVisible(false);

t.setText(“●標準型”);

s.setText(” 科學型”);

aa.setVisible(false);

bb.setVisible(false);

cc.setVisible(false);

dd.setVisible(false);

ee.setVisible(false);

ff.setVisible(false);

}

if(temp==s)

{//科學

sixteen.setVisible(true);

ten.setVisible(true);

eight.setVisible(true);

two.setVisible(true);

t.setText(” 標準型”);

s.setText(“●科學型”);

aa.setVisible(true);

bb.setVisible(true);

cc.setVisible(true);

dd.setVisible(true);

ee.setVisible(true);

ff.setVisible(true);

aa.setEnabled(false);

bb.setEnabled(false);

cc.setEnabled(false);

dd.setEnabled(false);

ee.setEnabled(false);

ff.setEnabled(false); }

if(temp==help)

{ //打開系統幫助文件要查資料

try

{

String filePath = “C:/WINDOWS/Help/calc.chm”;

Runtime.getRuntime().exec(“cmd.exe /c “+filePath);

}

catch(Exception eeee)

{

System.out.println(“打開系統的計算器出錯”);

}

if(temp==about)

{

JOptionPane.showMessageDialog(frame,” Java計算器\n 楊彩製作\n\n “,”關於計算器”,JOptionPane.INFORMATION_MESSAGE); ;

}

if(temp==me)

{

try

{

Process p = Runtime.getRuntime().exec(“explorer “);

}

catch(Exception eeee)

{

System.out.println(“打開指定網頁出錯”);

}

try

{

if(temp==sixteen)

{

String hex=text.getText();

int inthex=Integer.parseInt(hex,jin);//先把數變為10進制

text.setText(convert.decHex(inthex)) ;

jin=16;

aa.setEnabled(true);

bb.setEnabled(true);

cc.setEnabled(true);

dd.setEnabled(true);

ee.setEnabled(true);

ff.setEnabled(true);

num2.setEnabled(true);

num3.setEnabled(true);

num4.setEnabled(true);

num5.setEnabled(true);

num6.setEnabled(true);

num7.setEnabled(true);

num8.setEnabled(true);

num9.setEnabled(true);

}

if(temp==eight)

{

String oct =text.getText();

int intoct=Integer.parseInt(oct,jin);

text.setText(convert.decOct(intoct)) ;

jin=8;

aa.setEnabled(false);

bb.setEnabled(false);

cc.setEnabled(false);

dd.setEnabled(false);

ee.setEnabled(false);

ff.setEnabled(false);

num2.setEnabled(true);

num3.setEnabled(true);

num4.setEnabled(true);

num5.setEnabled(true);

num6.setEnabled(true);

num7.setEnabled(true);

num8.setEnabled(false);

num9.setEnabled(false);

}

if(temp==two)

{

String bin=text.getText();

int intbin=Integer.parseInt(bin,jin);

text.setText(convert.decBin(intbin));

jin=2;

aa.setEnabled(false);

bb.setEnabled(false);

cc.setEnabled(false);

dd.setEnabled(false);

ee.setEnabled(false);

ff.setEnabled(false);

num2.setEnabled(false);

num3.setEnabled(false);

num4.setEnabled(false);

num5.setEnabled(false);

num6.setEnabled(false);

num7.setEnabled(false);

num8.setEnabled(false);

num9.setEnabled(false);

}

if(temp==ten)

{

String dec=text.getText();

int intdec=Integer.parseInt(dec,jin);

// text.setText(convert.decDec(intdec)); //本句會把123變成321

text.setText(intdec+””);

jin=10;

aa.setEnabled(false);

bb.setEnabled(false);

cc.setEnabled(false);

dd.setEnabled(false);

ee.setEnabled(false);

ff.setEnabled(false);

num2.setEnabled(true);

num3.setEnabled(true);

num4.setEnabled(true);

num5.setEnabled(true);

num6.setEnabled(true);

num7.setEnabled(true);

num8.setEnabled(true);

num9.setEnabled(true);

}

catch(Exception ee)

{

System.out.println(“轉換出錯,可能你沒有輸入任何字符”);

text.setText(“轉換出錯”);

clear=false;

}

if(temp==backspace)

{//退格

String s = text.getText();

text.setText(“”);

for (int i = 0; i s.length() – 1; i++)

{

char a = s.charAt(i);

text.setText(text.getText() + a);

}

if (temp==ce)

{

text.setText(“0.”);

clear=true;

first=1;

}

if (temp==c)

{

text.setText(“0.”); ;

clear=true;

first=1;

}

if(temp==num0)

{

if(clear==false)//判斷是否點擊了符號位

text.setText(“”);

text.setText(text.getText()+”0″);

}

if(temp==num1)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”1″);

clear=true;//第二次不在清空（前二句）

}

if(temp==num2)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”2″);

clear=true;

}

if(temp==num3)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”3″);

clear=true;

}

if(temp==num4)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”4″);

clear=true;

}

if(temp==num5)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”5″);

clear=true;

}

if(temp==num6)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”6″);

clear=true;

}

if(temp==num7)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”7″);

clear=true;

}

if(temp==num8)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”8″);

clear=true;

}

if(temp==num9)

{

if(clear==false)

text.setText(“”);

text.setText(text.getText()+”9″);

clear=true;

}

if(temp==aa)

{

text.setText(text.getText()+”A”);

}

if(temp==bb)

{

text.setText(text.getText()+”B”);

}

if(temp==cc)

{

text.setText(text.getText()+”C”);

}

if(temp==dd)

{

text.setText(text.getText()+”D”);

}

if(temp==ee)

{

text.setText(text.getText()+”E”);

}

if(temp==ff)

{

text.setText(text.getText()+”F”);

}

if(temp==dian)

{

clickable=true;

for (int i = 0; i text.getText().length(); i++)

if (‘.’ == text.getText().charAt(i))

{

clickable=false;

break;

} //第一層判斷是否裡面含有小數點;

if(clickable==true)//第二壇判斷

text.setText(text.getText()+”.”);

}

try

{

if(temp==jia)

{//加法

qian=Double.parseDouble(text.getText());

fuhao=”+”;

clear=false;

}

if(temp==jian)

{

qian=Double.parseDouble(text.getText());

fuhao=”-“;

clear=false;

;

}

if(temp==cheng)

{

qian=Double.parseDouble(text.getText());

fuhao=”*”;

clear=false;

}

if(temp==chu)

{

qian=Double.parseDouble(text.getText());

fuhao=”/”;

clear=false;

}

if(temp==deng)

{

double ss=Double.parseDouble(text.getText());

text.setText(“”);

if(fuhao==”+”)

text.setText(qian+ss+””);

if(fuhao==”-“)

text.setText(qian-ss+””);

if(fuhao==”*”)

text.setText(qian*ss+””);

if(fuhao==”/”)

text.setText(qian/ss+””);

clear=false;//要清空前一次的數據

;

}

if(temp==kai)

{

String s = text.getText();

if (s.charAt(0) == ‘-‘)

{

text.setText(“負數不能開根號”);

}

else

text.setText(Double.toString(java.lang.Math.sqrt(Double.parseDouble(text.getText()))));

clear=false;

}

if(temp==diao)

{

if (text.getText().charAt(0) == ‘0’text.getText().length() == 1)

{

text.setText(“除數不能為零”);

}

else

{

boolean isDec = true;

int i, j, k;

String s = Double.toString(1 / Double.parseDouble(text.getText()));

for (i = 0; i s.length(); i++)

if (s.charAt(i) == ‘.’)

break;

for (j = i + 1; j s.length(); j++)

if (s.charAt(j) != ‘0’)

{

isDec = false;

break;

}

if (isDec == true)

{

String stemp = “”;

for (k = 0; k i; k++)

stemp += s.charAt(k);

text.setText(stemp);

}

else

text.setText(s);

}

clear=false;

}

if(temp==qiuyi)

{

text.setText(“0”);

clear=false;

}

if (temp == fu)

{ //導師，此方法參考書中例子

boolean isNumber = true;

String s = text.getText();

for (int i = 0; i s.length(); i++)

if (! (s.charAt(i) = ‘0’ s.charAt(i) = ‘9’ || s.charAt(i) == ‘.’ ||

s.charAt(i) == ‘-‘))

{

isNumber = false;

break;

}

if (isNumber == true)

{

//如果當前字符串首字母有’-‘號,代表現在是個負數,再按下時,則將首符號去掉

if (s.charAt(0) == ‘-‘)

{

text.setText(“”);

for (int i = 1; i s.length(); i++)

{

char a = s.charAt(i);

text.setText(text.getText() + a);

}

//如果當前字符串第一個字符不是符號，則添加一個符號在首字母處

else

text.setText(‘-‘ + s);

}

catch(Exception eee)

{

System.out.println(“運算時,首先輸入數字或字符”);

text.setText(“運算出錯”);

clear=false;

}

class WindowDestroyer extends WindowAdapter

{//退出窗口動作

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

class objConversion

{//導師,本進制類參考了CSMD類轉換例子

public void objConversion ()

{

}

public String decDec (int decNum)

{//10

String strDecNum = Integer.toString(decNum);

for (int i = strDecNum.length(); i 3; i++)

{

strDecNum = “0” + strDecNum;

}

// return strDecNum;

return invert (strDecNum, 5);

}

public String decHex (int decNum)

{//10 to 16

String strHexNum = “”;

int currentNum = 0;

while (decNum != 0)

{

if (decNum 15)

{

currentNum = decNum % 16;

decNum /= 16;

}

else

{

currentNum = decNum;

decNum = 0;

}

switch (currentNum)

{

case 15: strHexNum += “F”;

break;

case 14: strHexNum += “E”;

break;

case 13: strHexNum += “D”;

break;

case 12: strHexNum += “C”;

break;

case 11: strHexNum += “B”;

break;

case 10: strHexNum += “A”;

break;

default: strHexNum += Integer.toString(currentNum);

break;

}

return invert (strHexNum, 2);

}

public String decOct (int decNum)

{//10 to 8

String strOctNum = “”;

while (decNum != 0)

{

if (decNum 7)

{

strOctNum += Integer.toString(decNum % 8);

decNum /= 8;

}

else

{

strOctNum += Integer.toString(decNum);

decNum = 0;

}

return invert (strOctNum, 3);

}

public String decBin (int decNum)

{//10 to 2

String strBinNum = “”;

while (decNum != 0)

{

if (decNum 1)

{

strBinNum += Integer.toString(decNum % 2);

decNum /= 2;

}

else

{

strBinNum += Integer.toString(decNum);

decNum = 0;

}

return invert (strBinNum, 8);

}

private String invert (String strNum, int minLength) //轉換長度

{

String answer = “”;

int length = strNum.length();

if (length minLength)

{

for (int padding = (minLength – length); padding 0; padding–)

{

answer += “0”;

}

for (int i = length; i 0; i–)

{

answer += strNum.charAt (i – 1);

}

return answer;

}

public static void main(String arg[])//產生窗口

{

calculator win = new calculator();

win.setVisible(true);

}

第二個:

原創文章，作者：小藍，如若轉載，請註明出處：https://www.506064.com/zh-hant/n/206345.html

java習題,java試題及答案

本文目錄一覽：

Java 習題

JAVA 練習題

java練習題求完整代碼

java習題

相關推薦

發表回復