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Java几何计算器案例代码 ## Java几何计算器 成果展示 -  ### 1，程序主窗体代码（CalculatorWindow.java）```java import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener;import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JPanel;public class CalculatorWindow extends JFrame implements ActionListener,ItemListener { CardLayout mycard; JPanel controPanel,pCenter; JComboBox chooseList; JMenuBar menuBar; JMenu menu; JMenuItem mainWindow,exit; public CalculatorWindow(){ setTitle("常见几何图形计算器"); menuBar = new JMenuBar(); menu = new JMenu("操作"); mainWindow = new JMenuItem("主界面"); mainWindow.addActionListener(this); exit = new JMenuItem("退出"); exit.addActionListener(this); menu.add(mainWindow); menu.add(exit); menuBar.add(menu); setJMenuBar(menuBar); mycard = new CardLayout(); pCenter = new JPanel(); pCenter.setLayout(mycard); add(pCenter,"Center"); controPanel = new JPanel(); controPanel.setLayout(new BorderLayout()); chooseList = new JComboBox(); chooseList.addItem("请点击下拉列表选择"); chooseList.addItem("矩形的基本计算"); chooseList.addItem("圆的基本计算"); chooseList.addItem("三角形的基本计算"); chooseList.addItem("圆柱的基本计算"); chooseList.addItemListener(this); ImageIcon icon = new ImageIcon(图片地址); JButton imageButton = new JButton(icon); controPanel.add(imageButton,"Center"); controPanel.add(chooseList,"North"); pCenter.add("0",controPanel); pCenter.add("1",new RectanglePanel()); pCenter.add("2",new CirclePanel()); pCenter.add("3",new TrianglePanel()); pCenter.add("4",new CylinderPanel()); setBounds(100, 100, 700, 300); setResizable(false); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); } public void itemStateChanged(ItemEvent e) { int index = chooseList.getSelectedIndex(); String choice = String.valueOf(index); mycard.show(pCenter, choice); } public void actionPerformed(ActionEvent e) { if (e.getSource() == mainWindow) { mycard.first(pCenter); chooseList.setSelectedIndex(0); } else if (e.getSource() == exit) { System.exit(0); } } public static void main(String[] args) { new CalculatorWindow(); }} ```### 2，BoxPanel.java和AbstractPanel.java的实现 ```java //代码（BoxPanel.java）import java.awt.Font; import javax.swing.Box; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField;public class BoxPanel extends JPanel{ JTextField text; public BoxPanel(String s,int n) { Box box = Box.createHorizontalBox(); box.add(new JLabel(s)); text = new JTextField(" ",n); text.setHorizontalAlignment(JTextField.RIGHT); text.setFont(new Font("Arial",Font.BOLD,15)); box.add(text); add(box); } public JTextField getJTextField() { return text; } }//代码（AbstractPanel.java） import javax.swing.JPanel; import javax.swing.JTextField;public abstract class AbstractPanel extends JPanel { public abstract JTextField getInputTextField(); } ```###### 3，矩形计算器的实现（RectanglePanel.java） ```java import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener;import javax.swing.Box; import javax.swing.JButton; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField;public class RectanglePanel extends AbstractPanel implements ActionListener,FocusListener{ JButton resultButton,clearButton; JPanel leftPanel,rightPanel,buttonPanel; JTextField widthTextField,heightTextField; JTextField lengthTextField,areaTextField,inputTextField; BoxPanel bpWidth,bpHeight,bpLength,bpArea; public RectanglePanel() { setLayout(new GridLayout(1,2)); rightPanel = new KeyJPanel(this); leftPanel = new JPanel(); Box box = Box.createVerticalBox(); bpWidth = new BoxPanel("请输入矩形的宽", 10); widthTextField = bpWidth.getJTextField(); widthTextField.addFocusListener(this); bpHeight = new BoxPanel("请输入矩形的高",10); heightTextField = bpHeight.getJTextField(); heightTextField.addFocusListener(this); buttonPanel = new JPanel(); resultButton = new JButton("计算结果"); resultButton.addActionListener(this); clearButton = new JButton("清空"); clearButton.addActionListener(this); buttonPanel.add(resultButton); buttonPanel.add(clearButton); bpLength = new BoxPanel("矩形的周长：", 20); lengthTextField = bpLength.getJTextField(); bpArea = new BoxPanel("矩形的面积：",20); this.areaTextField = this.bpArea.getJTextField(); box.add(bpWidth); box.add(bpHeight); box.add(buttonPanel); box.add(bpLength); box.add(bpArea); leftPanel.add(box); add(leftPanel); add(rightPanel); } public void actionPerformed(ActionEvent e) { if (e.getSource() == resultButton) { try { double width = Double.parseDouble(widthTextField.getText()); double height = Double.parseDouble(heightTextField.getText()); lengthTextField.setText(""+2*(width + height)); areaTextField.setText(""+width*height); } catch (NumberFormatException e1) { JOptionPane.showMessageDialog(this, "请输入数字：","警告对话框",JOptionPane.WARNING_MESSAGE); } } else if (e.getSource() == clearButton) { widthTextField.setText(" "); heightTextField.setText(" "); } } public void focusGained(FocusEvent e) { inputTextField = (JTextField)e.getSource(); } public void focusLost(FocusEvent e) {} public JTextField getInputTextField() { return inputTextField; }} ```### 4，圆计算器的实现（CirclePanel.java） ```java import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener;import javax.swing.Box; import javax.swing.JButton; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField;public class CirclePanel extends AbstractPanel implements ActionListener,FocusListener{ JButton resultButton,clearButton; JPanel leftPanel,rightPanel,buttonPanel; JTextField radiusTextField; JTextField lengthTextField,areaTextField,inputTextField; BoxPanel bpRadius,bpLength,bpArea; public CirclePanel() { setLayout(new GridLayout(1,2)); rightPanel = new KeyJPanel(this); leftPanel =new JPanel(); Box box = Box.createVerticalBox(); bpRadius = new BoxPanel("请输入圆的半径：", 10); radiusTextField = bpRadius.getJTextField(); radiusTextField.addFocusListener(this); buttonPanel = new JPanel(); resultButton = new JButton("计算结果："); resultButton.addActionListener(this); clearButton = new JButton("清空"); clearButton.addActionListener(this); buttonPanel.add(resultButton); buttonPanel.add(clearButton); bpLength = new BoxPanel("圆的周长：", 20); lengthTextField = bpLength.getJTextField(); bpArea = new BoxpPanel("圆的面积：", 20); areaTextField = bpArea.getJTextField(); box.add(bpRadius); box.add(buttonPanel); box.add(bpLength); box.add(bpArea); leftPanel.add(box); add(leftPanel); add(rightPanel); } public void actionPerformed(ActionEvent e) { if (e.getSource() == resultButton) { try { double radius = Double.parseDouble(radiusTextField.getText()); lengthTextField.setText(""+2*Math.PI*radius); areaTextField.setText(""+Math.PI*radius*radius); } catch (NumberFormatException e1) { JOptionPane.showMessageDialog(this, "请输入数字：","警告对话框",JOptionPane.WARNING_MESSAGE); } } else if (e.getSource() == clearButton) { radiusTextField.setText(" "); } } public void focusGained(FocusEvent e) { inputTextField = (JTextField)e.getSource(); } public void focusLost(FocusEvent e) {} public JTextField getInputTextField() { return inputTextField; }} ```### 5，三角形计算器的实现（TrianglePanel.java） ```java import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener;import javax.swing.Box; import javax.swing.JButton; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField;public class TrianglePanel extends AbstractPanel implements ActionListener,FocusListener{ JButton resultButton,clearButton; JPanel leftPanel,rightPanel,buttonPanel; JTextField sideATextField,sideBTextField,sideCTextField; JTextField lengthTextField,areaTextField,inputTextField; BoxPanel bpSideA,bpSideB,bpSideC,bpLength,bpArea; public TrianglePanel() { setLayout(new GridLayout(1,2)); rightPanel = new KeyJPanel(this); leftPanel =new JPanel(); Box box = Box.createVerticalBox(); bpSideA = new BoxPanel("请输入三角形的边A：",10); sideATextField = bpSideA.getJTextField(); sideATextField.addFocusListener(this); bpSideB = new BoxPanel("请输入三角形的边B：",10); sideBTextField = bpSideB.getJTextField(); sideBTextField.addFocusListener(this); bpSideC = new BoxPanel("请输入三角形的边C：",10); sideCTextField = bpSideC.getJTextField(); sideCTextField.addFocusListener(this); buttonPanel = new JPanel(); resultButton = new JButton("计算结果："); resultButton.addActionListener(this); clearButton = new JButton("清空"); clearButton.addActionListener(this); buttonPanel.add(resultButton); buttonPanel.add(clearButton); bpLength = new BoxPanel("三角形的周长：", 20); lengthTextField = bpLength.getJTextField(); bpArea = new BoxPanel("三角形的面积：", 20); areaTextField = bpArea.getJTextField(); box.add(bpSideA); box.add(bpSideB); box.add(bpSideC); box.add(buttonPanel); box.add(bpLength); box.add(bpArea); leftPanel.add(box); add(leftPanel); add(rightPanel); } public void actionPerformed(ActionEvent e) { if (e.getSource() == resultButton) { try { double sideA = Double.parseDouble(sideATextField.getText()); double sideB = Double.parseDouble(sideBTextField.getText()); double sideC = Double.parseDouble(sideCTextField.getText()); if ((sideA + sideB>sideC)&&(sideA + sideC>sideB)&&(sideB + sideC>sideA)) { double p = (sideA + sideB +sideC)/2.0; lengthTextField.setText("" + 2 * p); double area = Math.sqrt(p * (p - sideA) * (p - sideB) *(p - sideC)); areaTextField.setText("" + area); } else { JOptionPane.showMessageDialog(this, "这不构成一个三角形，请重新输入三边","警告对话框",JOptionPane.WARNING_MESSAGE); } } catch (NumberFormatException e1) { JOptionPane.showMessageDialog(this, "请输入数字：","警告对话框",JOptionPane.WARNING_MESSAGE); } } else if (e.getSource() == clearButton) { sideATextField.setText(" "); sideBTextField.setText(" "); sideCTextField.setText(" "); } } public void focusGained(FocusEvent e) { inputTextField = (JTextField)e.getSource(); } public void focusLost(FocusEvent e) {} public JTextField getInputTextField() { return inputTextField; }} ```### 6，圆柱计算器的实现（CylinderPanel.java） ```java import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener;import javax.swing.Box; import javax.swing.JButton; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField;public class CylinderPanel extends AbstractPanel implements ActionListener,FocusListener{ JButton resultButton,clearButton; JPanel leftPanel,rightPanel,buttonPanel; JTextField radiusTextField,highTextField; JTextField surfaceAreaTextField,volumeTextField,inputTextField; BoxPanel bpRadius,bpHeight,bpSurfaceArea,bpVolume; public CylinderPanel() { setLayout(new GridLayout(1,2)); rightPanel = new KeyJPanel(this); leftPanel =new JPanel(); Box box = Box.createVerticalBox(); bpRadius = new BoxPanel("请输入圆柱的底面半径：", 10); radiusTextField = bpRadius.getJTextField(); radiusTextField.addFocusListener(this); bpHeight = new BoxPanel("请输入圆柱的高：", 10); highTextField = bpHeight.getJTextField(); highTextField.addFocusListener(this); buttonPanel = new JPanel(); resultButton = new JButton("计算结果："); resultButton.addActionListener(this); clearButton = new JButton("清空"); clearButton.addActionListener(this); buttonPanel.add(resultButton); buttonPanel.add(clearButton); bpSurfaceArea = new BoxPanel("圆柱的表面积：", 20); this.surfaceAreaTextField = this.bpSurfaceArea.getJTextField(); bpVolume = new BoxPanel("圆柱的体积：", 20); this.volumeTextField = this.bpVolume.getJTextField(); box.add(bpRadius); box.add(bpHeight); box.add(buttonPanel); box.add(bpSurfaceArea); box.add(bpVolume); leftPanel.add(box); add(leftPanel); add(rightPanel); } public void actionPerformed(ActionEvent e) { if (e.getSource() == resultButton) { try { double radius = Double.parseDouble(radiusTextField.getText()); double height = Double.parseDouble(highTextField.getText()); double area = Math.PI * radius *radius; surfaceAreaTextField.setText(""+(Math.PI * 2 * radius * height + 2 * area)); volumeTextField.setText(""+area * height); } catch (NumberFormatException e1) { JOptionPane.showMessageDialog(this, "请输入数字：","警告对话框",JOptionPane.WARNING_MESSAGE); } } else if (e.getSource() == clearButton) { radiusTextField.setText(" "); highTextField.setText(" "); } } public void focusLost(FocusEvent e) { inputTextField = (JTextField)e.getSource(); } public void focusGained(FocusEvent e) {} public JTextField getInputTextField() { return inputTextField; }} ```### 7，数字软键盘的实现（KeyJPanel.java） ```java import java.awt.Color; import java.awt.Font; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener;import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.border.Border;public class KeyJPanel extends JPanel implements ActionListener{ JButton[] keyButton = new JButton[12]; String[] num = {"1","2","3","4","5","6","7","8","9","0",".","BackSpace"}; AbstractPanel selectedPanel; JTextField inputTextField; public KeyJPanel(AbstractPanel selectedPanel) { this.selectedPanel = selectedPanel; Border lb = BorderFactory.createLineBorder(Color.gray, 2); setBorder(lb); setLayout(new GridLayout(4,3)); for (int i = 0; i < 12; i++) { keyButton[i] = new JButton(num[i]); keyButton[i].setFont(new Font("Arial",Font.BOLD,15)); keyButton[i].setForeground(Color.BLACK); keyButton[i].addActionListener(this); add(keyButton[i]); } } public void actionPerformed(ActionEvent e) { JButton button = (JButton)e.getSource(); inputTextField = selectedPanel.getInputTextField(); inputNumber(inputTextField,button); } private void inputNumber(JTextField tf, JButton button) { String oldString = tf.getText(); if (oldString == null) { tf.setText(" "); } String subStr = oldString.substring(0,oldString.length() -1); String newString = button.getText(); if (newString.equals("BackSpace")) { tf.setText(subStr); } else if (newString.equals(".")) { tf.setText(oldString+"."); } else { tf.setText(oldString+newString); } }} ```
