[Java]基于JFrame的計算器界面及部分功能實現(xiàn)-創(chuàng)新互聯(lián)
完成效果預覽
程序設(shè)計 -布局設(shè)計-
代碼部分? 程序基本架構(gòu)
程序設(shè)計 -布局設(shè)計-
整體布局采用BorderLayout，Center為程序主要交互部分，North為菜單界面。
主要界面由兩個采用GridLayout分布的子面板組成，兩個面板分別顯示計算過程和交互按鈕。
-主要使用控件-JLabel：通過標簽顯示計算式與結(jié)果。
JButton：通過按鈕實現(xiàn)程序與用戶的基本交互。
JPanel：通過面板組建程序圖形界面的基本布局。
JMenubar/JMenu/JMenuItem：用于組建菜單。
Font：用于設(shè)置字體樣式。
-數(shù)據(jù)結(jié)構(gòu)-通過數(shù)字棧與符號棧完成對算式的計算算法。
通過哈希表建立符號名稱到按鈕的映射。
代碼部分? 程序基本架構(gòu)
public class calculator {
public static void main(String[] argv) {
new app();
}
}import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class app extends JFrame {
private static String ex = "";
private static JLabel expression, res;// 分別存儲表達式 計算結(jié)果
private static Stacksign_stack = new Stack();// 符號棧
private static Stacknumber_stack = new Stack();// 數(shù)字棧
private static Double curIndex, totIndex;// 當前數(shù)字結(jié)果 整個表達式的數(shù)字結(jié)果
private static final String buttonName[][] = { { "C", "÷", "×", "Back" }, { "7", "8", "9", "-" },
{ "4", "5", "6", "+" },
{ "1", "2", "3", "√" }, { "%", "0", ".", "=" } };
private static JButton buttonList[][] = new JButton[5][4];
private static HashMapbuttonMap = new HashMap();// 映射 符號->按鈕
private static JMenuItem standardMode, sciMode, appearance, history;
private static Double unit = 1.0;// 用來記錄小數(shù)最小單位
// 計算結(jié)果并更新
private static void calculate() {
totIndex = 0.0;
Stacksstack = (Stack) sign_stack.clone();
Stacknstack = (Stack) number_stack.clone();
if (sstack.empty() || sstack.firstElement() != '÷')
nstack.push(curIndex);
else {
sstack.pop();
sstack.push('×');
nstack.push(1 / curIndex);
}
unit = 1.0;
while (!sstack.empty()) {
Character s = sstack.pop();
if (s == '+') {
double a = nstack.pop();
totIndex += a;
} else if (s == '-') {
double a = nstack.pop();
totIndex -= a;
} else if (s == '×') {
double a = nstack.pop(), b = nstack.pop();
nstack.push(a * b);
} else if (s == '÷') {
double a = nstack.pop(), b = nstack.pop();
nstack.push(b / a);
}
}
totIndex += nstack.pop();
}
// 數(shù)字按鍵事件
private static void NumberButtonAction(int n) {
if (number_stack.size()< sign_stack.size()) {
number_stack.push(curIndex);
curIndex = 0.0;
}
if (unit.equals(1.0)) {
curIndex = curIndex * 10 + n;
} else {
curIndex += n * unit;
unit /= 10;
}
res.setText(tool.Rounding(Double.toString(curIndex)));
ex += (char) (n + 48);
expression.setText(ex);
}
// 符號按鍵事件
private static void SignButtonAction(char sign) {
calculate();
res.setText(tool.Rounding(Double.toString(totIndex)));
if (sign_stack.empty() || sign_stack.firstElement() != '÷')
number_stack.push(curIndex);
else {
sign_stack.pop();
sign_stack.push('×');
number_stack.push(1 / curIndex);
}
unit = 1.0;
curIndex = 0.0;
sign_stack.push(sign);
ex += sign;
expression.setText(ex);
}
private static void buttonAction() {
buttonMap.get("1").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(1);
}
});
buttonMap.get("2").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(2);
}
});
buttonMap.get("3").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(3);
}
});
buttonMap.get("4").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(4);
}
});
buttonMap.get("5").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(5);
}
});
buttonMap.get("6").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(6);
}
});
buttonMap.get("7").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(7);
}
});
buttonMap.get("8").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(8);
}
});
buttonMap.get("9").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(9);
}
});
buttonMap.get("0").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberButtonAction(0);
}
});
buttonMap.get("C").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
ex = "";
expression.setText(ex);
curIndex = 0.0;
unit = 1.0;
res.setText(tool.Rounding(Double.toString(curIndex)));
sign_stack.clear();
}
});
buttonMap.get("=").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
calculate();
number_stack.clear();
sign_stack.clear();
res.setText(tool.Rounding(Double.toString(totIndex)));
number_stack.push(totIndex);
curIndex = totIndex;
ex = tool.Rounding(Double.toString(curIndex));
expression.setText(ex);
}
});
buttonMap.get("+").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
SignButtonAction('+');
}
});
buttonMap.get("-").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
SignButtonAction('-');
}
});
buttonMap.get("×").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
SignButtonAction('×');
}
});
buttonMap.get("÷").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
SignButtonAction('÷');
}
});
buttonMap.get("Back").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (ex.length() == 0) {
return;
}
char c = ex.charAt(ex.length() - 1);
ex = ex.substring(0, ex.length() - 1);
if (c == '.') {
unit = 1.0;
} else if (!unit.equals(1.0)) {
unit *= 10;
curIndex -= (c - 48) * unit;
} else {
if (c >= '0' && c<= '9') {
curIndex -= c - 48;
curIndex /= 10;
} else {
sign_stack.pop();
curIndex = number_stack.pop();
unit = tool.getDecimalUnit(curIndex);
}
}
expression.setText(ex);
res.setText(tool.Rounding(Double.toString(curIndex)));
}
});
buttonMap.get(".").addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (ex.charAt(ex.length() - 1) == '.')// 防止小數(shù)點重復輸入
return;
ex += '.';
expression.setText(ex);
unit /= 10;
}
});
}
private void UI() {
this.setLayout(new BorderLayout());
// 設(shè)置字體格式
Font font = new Font("黑體", Font.PLAIN, 50);
Font buttonFont = new Font("黑體", Font.PLAIN, 25);
Font menuFont = new Font("黑體", Font.PLAIN, 12);
// 菜單
JMenuBar bar = new JMenuBar();
JMenu mode = new JMenu("模式");
mode.setFont(menuFont);
standardMode = new JMenuItem("標準");
sciMode = new JMenuItem("科學");
mode.add(standardMode);
mode.add(sciMode);
JMenu func = new JMenu("功能");
func.setFont(menuFont);
appearance = new JMenuItem("外觀設(shè)置");
history = new JMenuItem("歷史記錄");
func.add(appearance);
func.add(history);
bar.add(mode);
bar.add(func);
this.add("North", bar);
//總面板
JPanel panel = new JPanel(new GridLayout(2, 1));
// 分面板一：計算器顯示界面
JPanel show = new JPanel(new GridLayout(2, 1));
expression = new JLabel();// 算術(shù)表達式
expression.setFont(font);
res = new JLabel(tool.Rounding(Double.toString(curIndex)));// 計算結(jié)果
res.setFont(new Font("黑體", Font.PLAIN, 35));
show.add(expression);
show.add(res);
// 分面板二：計算機按鍵
JPanel buttonPanel = new JPanel(new GridLayout(5, 4));
for (int i = 0; i< 5; i++) {
for (int j = 0; j< 4; j++) {
buttonList[i][j] = new JButton(buttonName[i][j]);
buttonMap.put(buttonName[i][j], buttonList[i][j]);
if (buttonName[i][j].equals("Back"))
buttonList[i][j].setFont(new Font("黑體", Font.PLAIN, 20));
else
buttonList[i][j].setFont(buttonFont);
if (buttonName[i][j].equals("="))
buttonList[i][j].setBackground(new Color(65, 105, 225));
else if (i >= 1 && j<= 2)
buttonList[i][j].setBackground(Color.white);
buttonPanel.add(buttonList[i][j]);
}
}
panel.add(show);
panel.add(buttonPanel);
this.add(panel);
//JFrame基本設(shè)置
this.setVisible(true);
this.setBounds(400, 150, 390, 550);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setTitle("燁的計算器");
}
app() {
curIndex = 0.0;
totIndex = 0.0;
UI();
buttonAction();
}
} public abstract class tool {
// 省略小數(shù)末尾的0
public static String Rounding(String s) {
if (s.lastIndexOf('.', s.length() - 1) == -1) {
return s;
}
int i = s.length() - 1;
for (; i >= 0; i--) {
if (s.charAt(i) == '.')
break;
if (s.charAt(i) != '0') {
return s.substring(0, i + 1);
}
}
return s.substring(0, i);
}
// 獲取最小小數(shù)單位
public static Double getDecimalUnit(Double n) {
String s = Double.toString(n);
if (s.indexOf('.') == -1) {
return 1.0;
}
return Math.pow(0.1, s.length() - s.indexOf('.'));
}
}你是否還在尋找穩(wěn)定的海外服務器提供商？創(chuàng)新互聯(lián)www.cdcxhl.cn海外機房具備T級流量清洗系統(tǒng)配攻擊溯源，準確流量調(diào)度確保服務器高可用性，企業(yè)級服務器適合批量采購，新人活動首月15元起，快前往官網(wǎng)查看詳情吧
分享標題：[Java]基于JFrame的計算器界面及部分功能實現(xiàn)-創(chuàng)新互聯(lián)
當前URL：http://bm7419.com/article28/hcccp.html
成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供外貿(mào)網(wǎng)站建設(shè)、品牌網(wǎng)站建設(shè)、定制開發(fā)、移動網(wǎng)站建設(shè)、網(wǎng)頁設(shè)計公司、建站公司
聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時需注明來源： 創(chuàng)新互聯(lián)
猜你還喜歡下面的內(nèi)容
- 軟件開發(fā)、網(wǎng)站開發(fā)有區(qū)別嗎？ 2022-12-16
- APP軟件開發(fā)在設(shè)計階段有哪些重要的方法呢 2016-11-12
- 上海理財APP軟件開發(fā)需要多少錢？ 2020-11-29
- 怎樣選擇APP軟件開發(fā)公司 2022-06-20
- 行業(yè)軟件開發(fā)遇到問題該如何解決 2022-07-18
- 成都打車APP軟件開發(fā)，成都打車APP軟件制作 2022-06-05
- APP軟件開發(fā)為什么那么貴，具體貴在哪里？ 2020-11-13
- 誰都能做北京APP開發(fā)？別把APP軟件開發(fā)門檻想得太低 2023-03-22
- 電商APP軟件開發(fā)的注意點 2023-03-24
- 關(guān)于軟件開發(fā)，老板不知道的6件事 2021-05-12
- 【成都網(wǎng)站設(shè)計】淺談中美軟件開發(fā)的差異性 2022-07-27
- 想做一名優(yōu)秀的軟件開發(fā)經(jīng)理？看看你是否具備這5個特征 2016-08-04