JAVA課程設(shè)計(jì)--簡(jiǎn)易計(jì)算器. 求源代碼.

import javax.swing.*;//新的窗口組件包

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import java.awt.*;

import java.awt.event.*;

public class Jisuanqi implements ActionListener

{ JFrame jf=new JFrame();

boolean dotExist, operated, equaled; // 幫助運(yùn)算的布爾變量

double result; // 目前的結(jié)果

char lastOperator; // 表示上一運(yùn)算符

JTextField jtf; // 顯示欄

JButton dot, plus, minus, multi, div, sqrt, equal, change, clear,quyu; // 運(yùn)算符

JButton[] numbers;

Panel p=new Panel();

// 構(gòu)造者

public Jisuanqi()

{

jf.setTitle("陳巳偉牌計(jì)算器");

// 初始化變量

dotExist = false; // 表示當(dāng)前的數(shù)是否有小數(shù)點(diǎn)

operated = false; // 表示任意運(yùn)算符是否被按下

equaled = false; // 表示等號(hào)是否被按下

result = 0;

lastOperator = '?';

// 初始化窗口變量

jtf = new JTextField("0");

jtf.setEditable(false); //設(shè)置文本框的可編輯性

jf.setSize(250,200);

jf.setVisible(true);

numbers = new JButton[10];

for (int i = 0; i 10; i++)

numbers[i] = new JButton("" + i);

dot = new JButton(".");

plus = new JButton("+");

minus = new JButton("-");

multi = new JButton("*");

div = new JButton("/");

sqrt = new JButton("√");

equal = new JButton("=");

change= new JButton("±");

clear = new JButton("NC");

quyu=new JButton("%");

p.setLayout(new GridLayout(5,4));

p.add(numbers[1]);

p.add(numbers[2]);

p.add(numbers[3]);

p.add(plus);

p.add(numbers[4]);

p.add(numbers[5]);

p.add(numbers[6]);

p.add(minus);

p.add(numbers[7]);

p.add(numbers[8]);

p.add(numbers[9]);

p.add(multi);

p.add(dot);

p.add(numbers[0]);

p.add(sqrt);

p.add(div);

p.add(equal);

p.add(change);

p.add(clear);

p.add(quyu);

jf.add(jtf,BorderLayout.NORTH);

jf.add(p,BorderLayout.CENTER);

numbers[0].addActionListener(this);

numbers[1].addActionListener(this);

numbers[2].addActionListener(this);

numbers[3].addActionListener(this);

plus.addActionListener(this);

numbers[4].addActionListener(this);

numbers[5].addActionListener(this);

numbers[6].addActionListener(this);

minus.addActionListener(this);

numbers[7].addActionListener(this);

numbers[8].addActionListener(this);

numbers[9].addActionListener(this);

multi.addActionListener(this);

dot.addActionListener(this);

sqrt.addActionListener(this);

div.addActionListener(this);

equal.addActionListener(this);

change.addActionListener(this);

clear.addActionListener(this);

quyu.addActionListener(this);

}

// 對(duì)按鈕進(jìn)行反應(yīng)的方法

public void actionPerformed(ActionEvent e)

{

JButton btn = (JButton)e.getSource();

if (btn == clear)

{

jtf.setText("0");

dotExist = false;

operated = false;

equaled = false;

result = 0;

lastOperator = '?';

}

else if (btn == equal)

{

operate('=');

equaled = true;

}

else if (btn == plus)

{

operate('+');

equaled = false;

}

else if (btn == minus)

{

operate('-');

equaled = false;

}

else if (btn == multi)

{

operate('*');

equaled = false;

}

else if (btn == div)

{

operate('/');

equaled = false;

}

else if (btn==quyu){

operate('%');

equaled=false;

}

else if (btn == change)

{

operate('p');

operate('=');

equaled = true;

}

else if (btn == sqrt)

{

operate('s');

operate('=');

equaled = true;

}

else

{

if (equaled)

result = 0;

for (int i = 0; i 10; i++)

if (btn == numbers[i])

{

if (jtf.getText().equals("0"))

jtf.setText("" + i);

else if(! operated)

jtf.setText(jtf.getText() + i);

else

{

jtf.setText("" + i);

operated = false;

}

}

if (btn == dot ! dotExist)

{

jtf.setText(jtf.getText() + ".");

}

}

}

// 進(jìn)行運(yùn)算的方法

private void operate(char operator)

{

double currentNumber = Double.valueOf(jtf.getText()).doubleValue();

if (lastOperator == '?')

result = currentNumber;

else if (lastOperator == '+')

result += currentNumber;

else if (lastOperator == '-')

result -= currentNumber;

else if (lastOperator == '*')

result *= currentNumber;

else if (lastOperator == '/')

result /= currentNumber;

else if(lastOperator=='%')

result %=currentNumber;

else if (lastOperator == 'p')

result *= -1;

else if (lastOperator == 's')

result = Math.sqrt(currentNumber);

else if (lastOperator == '=' equaled)

result = currentNumber;

jtf.setText("" + result);

operated = true;

lastOperator = operator;

}

public static void main(String[] args)

{new Jisuanqi();br br }

}

java新手,求完整的源代碼

//都是從新手過(guò)來(lái)的，以下代碼供參考

//1.

public?class?BankAccount?{

private?static?String?acctnum;

private?static?double?money;

private?static?void?showAcct()?{

System.out.println("賬號(hào)為:?"?+?acctnum);

}

private?static?void?showMoney()?{

System.out.println("余額為:?"?+?money);

}

public?BankAccount(String?acc,?double?m)?{

this.acctnum?=?acc;

this.money?=?m;

}

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

BankAccount?ba?=?new?BankAccount("626600018888",?5000.00);

ba.showAcct();

ba.showMoney();

}

}

//2.

public?class?Triangle?{

private?static?float?a;

private?static?float?b;

private?static?float?c;

public?Triangle(float?a,?float?b,?float?c)?{

this.a?=?a;

this.b?=?b;

this.c?=?c;

}

public?static?boolean?judgeTriangle(float?a,?float?b,?float?c)?{

if?((a??Math.abs(b?-?c)??a??b?+?c)

?(b??Math.abs(a?-?c)??b??a?+?c)

?(c??Math.abs(a?-?b)??c??a?+?b))

return?true;

else

return?false;

}

public?float?getCircumference()?{

return?this.a?+?this.b?+?this.c;

}

}

//3.

public?class?TestTriangle?{

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

Triangle?t?=?new?Triangle(5.3f,7.8f,9.3f);

if(t.judgeTriangle(5.3f,7.8f,9.3f)){

System.out.print("能夠成三角形，周長(zhǎng)為:?");

System.out.printf("%9.2f",t.getCircumference());}

else

System.out.println("不能構(gòu)成三角形");

}

}

什么是java源代碼 怎么查看

你說(shuō)的java源代碼是指編譯成的class文件前的java文件。

當(dāng)我們運(yùn)行.java文件時(shí)，它會(huì)被系統(tǒng)編譯成.class文件，例如Test.java編譯之后就是Test.class，

源文件就是指Test.java文件，

一般部署項(xiàng)目時(shí)，有.class文件就可以發(fā)布運(yùn)行了，但是如果想修改這個(gè)系統(tǒng)，.class是不能修改的，要有.java文件才能修改

也可以上網(wǎng)去下反編譯軟件，就是能把.class文件大部分還原成.java文件的工具，但不是100%還原，而且如果不是正版的，小心有毒啊，什么的。

java課程設(shè)計(jì)源代碼（急?。。。。?/h2>

import java.awt.Color;

import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.SwingConstants;

import javax.swing.border.LineBorder;

public class game21 extends JFrame {

private JLabel label_2;

private int number;

private int sum;

final JLabel label = new JLabel();

final JLabel label_1 = new JLabel();

public static void main(String[] args) {

new game21();

}

public game21() {

super("21點(diǎn)？！");

getContentPane().setLayout(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JButton button = new JButton();

button.addActionListener(new ActionListener() {

public void actionPerformed(final ActionEvent arg0) {

onClick();

}

});

button.setText("出牌");

button.setBounds(170, 350, 106, 28);

getContentPane().add(button);

label.setBorder(new LineBorder(Color.black, 1, false));

label.setHorizontalAlignment(SwingConstants.CENTER);

label.setFont(new Font("", Font.BOLD, 26));

label.setText("背面");

label.setBounds(158, 81, 137, 153);

getContentPane().add(label);

label_1.setText("你已經(jīng)擁有的牌:");

label_1.setBounds(109, 22, 270, 45);

getContentPane().add(label_1);

this.setBounds(200, 300, 501, 528);

this.setVisible(true);

getContentPane().add(getLabel_2());

}

public int randNumber() {

try {

Thread.sleep(10);

} catch (InterruptedException e) {

e.printStackTrace();

}

return (int) (Math.random() * 10 + 1);

}

public void onClick() {

number = this.randNumber();

this.sum += number;

label.setText("" + number);

String strTemp = this.label_1.getText();

strTemp += "" + number + " ";

label_1.setText(strTemp);

String temp = "合計(jì)：" + sum;

label_2.setText(temp);

isWin();

}

public void isWin() {

if (sum 21) {

JOptionPane.showMessageDialog(this, "你輸了");

clear();

return;

} else if (sum == 21) {

JOptionPane.showMessageDialog(this, "你贏了");

clear();

return;

} else {

int i = JOptionPane.showOptionDialog(this, "是否繼續(xù)？", "提示",

JOptionPane.OK_CANCEL_OPTION,

JOptionPane.INFORMATION_MESSAGE, null, null, null);

if (i == JOptionPane.OK_OPTION) {

onClick();

} else

return;

}

}

private void clear() {

label_2.setText("合計(jì)：");

sum = 0;

number = 0;

label_1.setText("你已經(jīng)擁有的牌:");

}

/**

* @return

*/

protected JLabel getLabel_2() {

if (label_2 == null) {

label_2 = new JLabel();

label_2.setText("合計(jì):");

label_2.setBounds(313, 35, 66, 18);

}

return label_2;

}

}

真好無(wú)聊中。。

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