這個計算器是我學Java時寫的第一個Swing程序，后來我讀《大話設計模式》的第一章簡單工廠模式恰好也是計算器，于是就改進了之前這個。

源代碼下載：https://github.com/myCodingTrip/Calculator

運算類Operation.java

public abstract class Operation {protected double numberA = 0;protected double numberB = 0;protected double result = 0;public double getNumberA() {return numberA;}public void setNumberA(double numberA) {this.numberA = numberA;}public double getNumberB() {return numberB;}public void setNumberB(double numberB) {this.numberB = numberB;}public abstract double getResult(); }class OperationAdd extends Operation{@Overridepublic double getResult() {double result = 0;result = numberA + numberB;return result;} } class OperationSub extends Operation{@Overridepublic double getResult() {result = numberA - numberB;return result;} } class OperationMul extends Operation{@Overridepublic double getResult() {result = numberA * numberB;return result;} } class OperationDiv extends Operation{@Overridepublic double getResult(){try {result = numberA / numberB;} catch (Exception e) {System.out.println("除數不能為0");e.printStackTrace();}return result;} } 工廠類 OperationFactory.java //簡單工廠模式 //只需要傳入運算符號，工廠就實例化出合適的對象，用過多態，返回父類的方式實現計算器的結果 public class OperationFactory {public static Operation createOperate(char sign) {Operation operation = null;switch (sign) {case '+':operation = new OperationAdd();break;case '-':operation = new OperationSub();break;case '*':operation = new OperationMul();break;case '/':operation = new OperationDiv();break;default:break;}return operation;} } 計算器界面CalculateFrame.java import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent;import javax.swing.ButtonGroup; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JTextField;@SuppressWarnings("serial") public class CalculateFrame extends JFrame{private JTextField textData1, textData2, textResult;private JLabel labelNum1, labelNum2, labelResult;private JRadioButton radioAdd, radioSub, radioMul, radioDiv;private JButton btnCalculate;private Operation oper;//進行運算的兩個數字和結果private String data1, data2, operation;private double resultNum;public CalculateFrame(){ //設置窗口基本屬性this.setTitle("簡單計算器");this.setSize(300, 200);//本機分辨率為1366*768this.setLocation(1366/2-300/2, 768/2-200/2);//this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.addWindowListener(new WindowAdapter(){@Overridepublic void windowClosing(WindowEvent e) {setVisible (false);System.exit(0);}});initView();initLayout();this.setVisible(true);//顯示窗口btnCalculate.addActionListener(new ButtonListener()); }//設置一些功能區域public void initView() {textData1 = new JTextField();textData2 = new JTextField();textResult = new JTextField();textResult.setEnabled(false);labelNum1 = new JLabel("第一個數：");labelNum2 = new JLabel("第二個數：");labelResult = new JLabel("結果：");btnCalculate = new JButton("計算");radioAdd = new JRadioButton("+");radioSub = new JRadioButton("-");radioMul = new JRadioButton("*");radioDiv = new JRadioButton("/");}//將控件加入到布局中public void initLayout() {JPanel p1 = new JPanel(new GridLayout(1,2));p1.add(labelNum1);p1.add(textData1);JPanel p2 = new JPanel(new GridLayout(1,4));p2.add(radioAdd);p2.add(radioSub);p2.add(radioMul);p2.add(radioDiv); JPanel p3 = new JPanel(new GridLayout(1,2));p3.add(labelNum2);p3.add(textData2);JPanel p4 = new JPanel(new GridLayout(1,2));p4.add(labelResult);p4.add(textResult);JPanel p5 = new JPanel(new GridLayout(1,1));p5.add(btnCalculate); this.setLayout(new GridLayout(5,1)); this.add(p1);this.add(p2);this.add(p3);this.add(p4);this.add(p5); ButtonGroup group = new ButtonGroup();group.add(radioAdd);group.add(radioSub);group.add(radioMul);group.add(radioDiv);}class ButtonListener implements ActionListener{//從程序中讀入數據public void actionPerformed(ActionEvent e) {data1 = textData1.getText();data2 = textData2.getText();operation = "";if(radioAdd.isSelected()) operation = radioAdd.getText();else if(radioSub.isSelected()) operation = radioSub.getText(); else if(radioMul.isSelected()) operation = radioMul.getText(); else if(radioDiv.isSelected()) operation = radioDiv.getText();//將運算符號傳入工廠中進行實例化oper = OperationFactory.createOperate(operation.charAt(0));oper.numberA = Double.parseDouble(data1);oper.numberB = Double.parseDouble(data2);resultNum = oper.getResult();textResult.setText(String.valueOf(resultNum));}} } 主程序 Main.java public class Main {public static void main(String[] args) {new CalculateFrame();} }

程序界面：

轉載于:https://www.cnblogs.com/mycd/p/5716328.html

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