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Java swing實(shí)現(xiàn)的計(jì)算器功能完整實(shí)例

更新時(shí)間：2017年12月13日 14:02:31 作者：xxiaowen

這篇文章主要介紹了Java swing實(shí)現(xiàn)的計(jì)算器功能,結(jié)合完整實(shí)例形式分析了java基于swing組件實(shí)現(xiàn)計(jì)算器布局與運(yùn)算功能的具體操作技巧,需要的朋友可以參考下

本文實(shí)例講述了Java swing實(shí)現(xiàn)的計(jì)算器功能。分享給大家供大家參考，具體如下：

package awtDemo;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Vector;
public class Calculator {
  String str1 = "0"; // 運(yùn)算數(shù)1 初值一定為0 為了程序的安全
  String str2 = "0"; // 運(yùn)算數(shù)2
  String signal = "+"; // 運(yùn)算符
  String result = "";// 結(jié)果
  // 狀態(tài)開關(guān)
  int k1 = 1;// 開關(guān)1 用于選擇輸入方向 將要寫入str2或 str2
  int k2 = 1;// 開關(guān)2 符號(hào)鍵 次數(shù) k2>1說明進(jìn)行的是2+3-9+8 這樣的多符號(hào)運(yùn)算
  int k3 = 1;// 開關(guān)3 str1 是否可以被清0 ==1時(shí)可以 !=1時(shí)不能被清0
  int k4 = 1;// 開關(guān)4 str2 同上
  int k5 = 1;// 開關(guān)5 控制小數(shù)點(diǎn)可否被錄入 ==1時(shí)可以 !=1 輸入的小數(shù)點(diǎn)被丟掉
  JButton store; // 寄存器 記錄 是否連續(xù)按下符號(hào)鍵
  @SuppressWarnings("rawtypes")
  Vector vt = new Vector(20, 10);
  JFrame frame = new JFrame("腳本之家 - 計(jì)算器");
  JTextField result_TextField = new JTextField(result, 20);// 20列
  JButton clear_Button = new JButton("清除");
  JButton button0 = new JButton("0");
  JButton button1 = new JButton("1");
  JButton button2 = new JButton("2");
  JButton button3 = new JButton("3");
  JButton button4 = new JButton("4");
  JButton button5 = new JButton("5");
  JButton button6 = new JButton("6");
  JButton button7 = new JButton("7");
  JButton button8 = new JButton("8");
  JButton button9 = new JButton("9");
  JButton button_Dian = new JButton(".");
  JButton button_jia = new JButton("+");
  JButton button_jian = new JButton("-");
  JButton button_cheng = new JButton("*");
  JButton button_chu = new JButton("/");
  JButton button_dy = new JButton("=");
  Calculator() {
    button0.setMnemonic(KeyEvent.VK_0);// 等效鍵
    // 其它 等效鍵 略,
    result_TextField.setHorizontalAlignment(JTextField.RIGHT);// 文本框 右對(duì)齊
    JPanel pan = new JPanel();
    pan.setLayout(new GridLayout(4, 4, 5, 5));// 四行四列 邊距為5像素
    pan.add(button7);
    pan.add(button8);
    pan.add(button9);
    pan.add(button_chu);
    pan.add(button4);
    pan.add(button5);
    pan.add(button6);
    pan.add(button_cheng);
    pan.add(button1);
    pan.add(button2);
    pan.add(button3);
    pan.add(button_jian);
    pan.add(button0);
    pan.add(button_Dian);
    pan.add(button_dy);
    pan.add(button_jia);
    pan.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));// pan對(duì)象的邊距
    JPanel pan2 = new JPanel();
    pan2.setLayout(new BorderLayout());
    pan2.add(result_TextField, BorderLayout.WEST);
    pan2.add(clear_Button, BorderLayout.EAST);
    frame.setLocation(300, 200); // 主窗口 出現(xiàn)在位置
    frame.setResizable(false); // 不能調(diào)大小
    frame.getContentPane().setLayout(new BorderLayout());
    frame.getContentPane().add(pan2, BorderLayout.NORTH);
    frame.getContentPane().add(pan, BorderLayout.CENTER);
    frame.pack();
    frame.setVisible(true);
    // 事件處理 程 序
    // 數(shù) 字 鍵
    class Listener implements ActionListener {
      @SuppressWarnings("unchecked")
      public void actionPerformed(ActionEvent e) {
        String ss = ((JButton) e.getSource()).getText();
        store = (JButton) e.getSource();
        vt.add(store);
        if (k1 == 1) {
          if (k3 == 1) {
            str1 = "";
            k5 = 1;// 還原開關(guān)k5狀態(tài)
          }
          str1 = str1 + ss;
          k3 = k3 + 1;
          result_TextField.setText(str1);// 顯示
        } else if (k1 == 2) {
          if (k4 == 1) {
            str2 = "";
            k5 = 1; // 還原開關(guān)k5狀態(tài)
          }
          str2 = str2 + ss;
          k4 = k4 + 1;
          result_TextField.setText(str2);
        }
      }
    }
    // 符 號(hào)
    class Listener_signal implements ActionListener {
      @SuppressWarnings("unchecked")
      public void actionPerformed(ActionEvent e) {
        String ss2 = ((JButton) e.getSource()).getText();
        store = (JButton) e.getSource();
        vt.add(store);
        if (k2 == 1) {
          k1 = 2;// 開關(guān) k1 為1時(shí),向數(shù)1寫 為2時(shí)，向數(shù)2寫
          k5 = 1;
          signal = ss2;
          k2 = k2 + 1;// 按符號(hào)鍵的次數(shù)
        } else {
          int a = vt.size();
          JButton c = (JButton) vt.get(a - 2);
          if (!(c.getText().equals("+"))
              && !(c.getText().equals("-"))
              && !(c.getText().equals("*"))
              && !(c.getText().equals("/")))
          {
            cal();
            str1 = result;
            k1 = 2;// 開關(guān) k1 為1時(shí),向數(shù)1寫 為2時(shí)，向數(shù)2寫
            k5 = 1;
            k4 = 1;
            signal = ss2;
          }
          k2 = k2 + 1;
        }
      }
    }
    // 清除
    class Listener_clear implements ActionListener {
      @SuppressWarnings("unchecked")
      public void actionPerformed(ActionEvent e) {
        store = (JButton) e.getSource();
        vt.add(store);
        k5 = 1;
        k2 = 1;
        k1 = 1;
        k3 = 1;
        k4 = 1;
        str1 = "0";
        str2 = "0";
        signal = "";
        result = "";
        result_TextField.setText(result);
        vt.clear();
      }
    }
    // 等 于
    class Listener_dy implements ActionListener {
      @SuppressWarnings("unchecked")
      public void actionPerformed(ActionEvent e) {
        store = (JButton) e.getSource();
        vt.add(store);
        cal();
        k1 = 1; // 還原開關(guān)k1狀態(tài)
        // str1=result;
        k2 = 1;
        k3 = 1;// 還原開關(guān)k3狀態(tài)
        k4 = 1; // 還原開關(guān)k4狀態(tài)
        str1 = result; // 為7+5=12 +5=17 這種計(jì)算做準(zhǔn)備
      }
    }
    // 小數(shù)點(diǎn)
    class Listener_xiaos implements ActionListener {
      @SuppressWarnings("unchecked")
      public void actionPerformed(ActionEvent e) {
        store = (JButton) e.getSource();
        vt.add(store);
        if (k5 == 1) {
          String ss2 = ((JButton) e.getSource()).getText();
          if (k1 == 1) {
            if (k3 == 1) {
              str1 = "";
              k5 = 1; // 還原開關(guān)k5狀態(tài)
            }
            str1 = str1 + ss2;
            k3 = k3 + 1;
            result_TextField.setText(str1);// 顯示
          } else if (k1 == 2) {
            if (k4 == 1) {
              str2 = "";
              k5 = 1; // 還原開關(guān)k5狀態(tài)
            }
            str2 = str2 + ss2;
            k4 = k4 + 1;
            result_TextField.setText(str2);
          }
        }
        k5 = k5 + 1;
      }
    }
    // 注冊(cè) 監(jiān)聽器
    Listener_dy jt_dy = new Listener_dy();
    Listener jt = new Listener();// 臨聽數(shù)字鍵
    Listener_signal jt_signal = new Listener_signal();// 臨 聽符 號(hào)鍵
    Listener_clear jt_c = new Listener_clear(); // 清除鍵
    Listener_xiaos jt_xs = new Listener_xiaos();// 小數(shù)點(diǎn) 鍵
    button7.addActionListener(jt);
    button8.addActionListener(jt);
    button9.addActionListener(jt);
    button_chu.addActionListener(jt_signal);
    button4.addActionListener(jt);
    button5.addActionListener(jt);
    button6.addActionListener(jt);
    button_cheng.addActionListener(jt_signal);
    button1.addActionListener(jt);
    button2.addActionListener(jt);
    button3.addActionListener(jt);
    button_jian.addActionListener(jt_signal);
    button0.addActionListener(jt);
    button_Dian.addActionListener(jt_xs);
    button_dy.addActionListener(jt_dy);
    button_jia.addActionListener(jt_signal);
    clear_Button.addActionListener(jt_c);
    // 關(guān)閉事件處理程序
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
  }
  // 計(jì) 算
  public void cal() {
    double a2;// 運(yùn)算數(shù)1
    double b2;// 運(yùn)算數(shù)2
    String c = signal;// 運(yùn)算符
    double result2 = 0;// 結(jié)果
    if (c.equals("")) {
      result_TextField.setText("請(qǐng)輸入運(yùn)算符");
    } else {
      if (str1.equals(".")) // 字符串 "." 轉(zhuǎn)換成double型數(shù)據(jù)時(shí) 會(huì)出錯(cuò) 所以手工轉(zhuǎn)
        str1 = "0.0";
      if (str2.equals("."))
        str2 = "0.0";
      a2 = Double.valueOf(str1).doubleValue();
      b2 = Double.valueOf(str2).doubleValue();
      if (c.equals("+")) {
        result2 = a2 + b2;
      }
      if (c.equals("-")) {
        result2 = a2 - b2;
      }
      if (c.equals("*")) {
        result2 = a2 * b2;
      }
      if (c.equals("/")) {
        if (b2 == 0) {
          result2 = 0;
        } else {
          result2 = a2 / b2;
        }
      }
      result = ((new Double(result2)).toString());
      result_TextField.setText(result);
    }
  }
  @SuppressWarnings("unused")
  public static void main(String[] args) {
    // 界面風(fēng)格，可以去除
  try {
          UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    } catch (Exception e) {
      e.printStackTrace();
    }
    Calculator cal = new Calculator();
  }
}

運(yùn)行效果：