几何图形计算器的设计与实现----代码实现

点此处查看 课程设计说明书

1.创建实体类：

// Circle.java
public class Circle {
	private double r;

	public double getR() {
		return r;
	}

	public void setR(double r) {
		this.r = r;
	}

	@Override
	public String toString() {
		return "Circle [r=" + r + "]";
	}

	public Circle() {
		super();
	}

	public Circle(double r) {
		super();
		this.r = r;
	}
	public double Circle_Space(){
		 double space=3.14*r*r;		
		 return Math.round(space*100)/100.00;
	}
	public double Circle_Girth(){
		double girth=2*3.14*r;
		return Math.round(girth*100)/100.00;
	}
}

// Column.java 

public class Column {
	private double r;
	private double h;
	public double getR() {
		return r;
	}
	public void setR(double r) {
		this.r = r;
	}
	public double getH() {
		return h;
	}
	public void setH(double h) {
		this.h = h;
	}
	@Override
	public String toString() {
		return "Column [r=" + r + ", h=" + h + "]";
	}
	
	public Column() {
		super();
	}
	public Column(double r, double h) {
		super();
		this.r = r;
		this.h = h;
	}
	public double Column_bottom_Space(){
		  double space=3.14*r*r;
		  return Math.round(space*100)/100.00;
	}
	public double Column_Surface_Space(){
		double space= 6.28*r*r+2*r*3.14*h;
		return Math.round(space*100)/100.00;
	}
	public double Column_Volume(){
		double volume= 3.14*r*r*h;
		return Math.round(volume*100)/100.00;
	}
	
}

// Rectangle.java

public class Rectangle {
    private double height;
    private double width;
    public double getHeight() {
        return height;
    }
    public void setHeight(double height) {
        this.height = height;
    }
    public double getWidth() {
        return width;
    }
    public void setWidth(double width) {
        this.width = width;
    }
    @Override
    public String toString() {
        return "Rectangle [height=" + height + ", width=" + width + "]";
    }
    
    public Rectangle() {
        super();
    }
    public Rectangle(double height, double width) {
        super();
        this.height = height;
        this.width = width;
    }
    public double Rectangle_Girth(){
        double girth=2*(height+width);
        return Math.round(girth*100)/100.00;
    }
    public double Rectangle_Space(){
        double space=    height*width;
        return  Math.round(space*100)/100.00;
        
    }
}

// Triangle.java 

public class Triangle {
    private double a;
    private double b;
    private double c;
    
    public double getA() {
        return a;
    }

    public void setA(double a) {
        this.a = a;
    }

    public double getB() {
        return b;
    }

    public void setB(double b) {
        this.b = b;
    }

    public double getC() {
        return c;
    }

    public void setC(double c) {
        this.c = c;
    }

    @Override
    public String toString() {
        return "Triangle [a=" + a + ", b=" + b + ", c=" + c + "]";
    }
    
    public Triangle() {
        super();
    }
    public Triangle(double a, double b, double c) {
        super();
        this.a = a;
        this.b = b;
        this.c = c;
    }
    public  boolean isTriangle(){
        if (a+b>c&&a+c>b&&b+c>a)
            return true;
        else
            return false;
    }
    public double Triangle_Girth(){
        
        return Math.round((a+b+c)*100)/100.00;
    }
    public double Triangle_Space(){
        //System.out.println(a*b*c);
        double p = (a+b+c) / 2;
        double space=Math.pow(p*(p-a)*(p-b)*(p-c), 0.5);
        return  Math.round((space)*100)/100.00;
    }

}

2.创建视图

// Main.java

import java.awt.*;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

import com.s.pojo.Circle;
import com.s.pojo.Column;
import com.s.pojo.Rectangle;
import com.s.pojo.Triangle;
/**
 * 默认保留两位小数
 * @author Administrator
 *
 */
public class Main extends JFrame implements ActionListener {
	private JTextField jTextField1;
	private JTextField jTextField2;
	private JTextField jTextField3;
	private JTextField jTextField4;
	private JTextField flag;
	private JPanel Panel,jp;
	/**
	 * 组合框
	 * @return
	 */
	public JPanel getJComboBox() {
		JPanel jPanel = new JPanel();
		String str[] = {"请单击下拉列表选择", 
						"矩形的基本计算", 
						"圆的基本运算", 
						"三角形的基本运算", 
						"圆柱的基本运算",
						"退出系统"};
		JComboBox jComboBox = new JComboBox<>(str);
		jComboBox.setPreferredSize(new Dimension(600, 30));
		// 添加监听器，并重写方法
		jComboBox.addItemListener(new ItemListener() {
			
			@Override
			public void itemStateChanged(ItemEvent e) {
				if (e.getStateChange() == ItemEvent.SELECTED) {
					switch(jComboBox.getSelectedIndex()) {
					case 0:
						
						jp.setVisible(false);
						Panel.removeAll();
						Panel.add(getMainView());
						Panel.repaint();
						Panel.validate();
						break;
					case 1:
						jp.setVisible(true);
						Panel.removeAll();
						Panel.add(getRectangleView());
						Panel.repaint();
						Panel.validate();
						break;
					case 2:
						jp.setVisible(true);
						Panel.removeAll();
						Panel.add(getCircleView());
						Panel.repaint();
						Panel.validate();
						break;
					case 3:
						jp.setVisible(true);
						Panel.removeAll();
						Panel.add(getTriangleView());
						Panel.repaint();
						Panel.validate();
						break;
					case 4:
						jp.setVisible(true);
						Panel.removeAll();
						Panel.add(getColumnView());
						Panel.repaint();
						Panel.validate();
						break;
					case 5:
						//退出系统
						System.exit(0);
					}
				}
			}
		});
		jPanel.add(jComboBox);
		return jPanel;
	}
	/**
	 * 主面板
	 * @return
	 */
	public JPanel getMainView() {
		JPanel jPanel = new JPanel();
		return jPanel;
	}
	/**
	 * 获取键盘
	 * @return
	 */
	public JPanel getKeyBoard() {
		JPanel jPanel = new JPanel();
		jPanel.setLayout(new GridLayout(4,3));
		JButton []jButton = new JButton[12];
		jButton[0] = new JButton("0");
		jButton[0].addActionListener(this);
		jButton[1] = new JButton("1");
		jButton[1].addActionListener(this);
		jButton[2] = new JButton("2");
		jButton[2].addActionListener(this);
		jButton[3] = new JButton("3");
		jButton[3].addActionListener(this);
		jButton[4] = new JButton("4");
		jButton[4].addActionListener(this);
		jButton[5] = new JButton("5");
		jButton[5].addActionListener(this);
		jButton[6] = new JButton("6");
		jButton[6].addActionListener(this);
		jButton[7] = new JButton("7");
		jButton[7].addActionListener(this);
		jButton[8] = new JButton("8");
		jButton[8].addActionListener(this);
		jButton[9] = new JButton("9");
		jButton[9].addActionListener(this);
		jButton[10] = new JButton(".");
		jButton[10].addActionListener(this);
		jButton[11] = new JButton("BackSpace");
		jButton[11].addActionListener(this);
		jPanel.add(jButton[1]);
		jPanel.add(jButton[2]);
		jPanel.add(jButton[3]);
		jPanel.add(jButton[4]);
		jPanel.add(jButton[5]);
		jPanel.add(jButton[6]);
		jPanel.add(jButton[7]);
		jPanel.add(jButton[8]);
		jPanel.add(jButton[9]);
		jPanel.add(jButton[0]);
		jPanel.add(jButton[10]);
		jPanel.add(jButton[11]);
		jPanel.setPreferredSize(new Dimension(300, 240));
		return jPanel;
	}
	/**
	 * 矩形的基本运算
	 * @return
	 */
	public JPanel getRectangleView() {
		JPanel jPanel = new JPanel();
		JLabel jLabel1 = new JLabel("请输入矩形的长：");
		JLabel jLabel2 = new JLabel("请输入矩形的宽：");
		JButton jButton1 = new JButton("计算结果：");
		JButton jButton2 = new JButton("清空");
		//jPanel.setLayout(new GridLayout(1,2));
		JPanel jp = new JPanel();
		jp.setLayout(new GridLayout(5,1));
		JPanel jp1 = new JPanel();
		jp1.setLayout(new GridLayout(2,2));
		jp1.add(jLabel1);
		jp1.add(jTextField1);
		jTextField1.setText("");
		jp1.add(jLabel2);
		jp1.add(jTextField2);
		jTextField2.setText("");
		JPanel jp11 = new JPanel();
		jp11.add(jp1);
		JPanel jp3 = new JPanel();
		JTextField field1 = new JTextField();
		JTextField field2 = new JTextField();
		jp3.setLayout(new GridLayout(2,2));
		jp3.add(new JLabel("矩形的周长为："));
		jp3.add(field1);
		jp3.add(new JLabel("矩形的面积为："));
		jp3.add(field2);
		JPanel jp33 = new JPanel();
		jp33.add(jp3);
		jButton1.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				flag = jTextField4;
				System.out.println(jTextField1.getText());
				System.out.println(jTextField2.getText());
				if(!jTextField1.getText().trim().equals("")&& 
						!jTextField1.getText().isEmpty() && 
						!jTextField2.getText().trim().equals("") &&
						!jTextField2.getText().trim().isEmpty()) {
					Rectangle rectangle =new Rectangle();
					rectangle.setHeight(Double.parseDouble(jTextField1.getText()));
					rectangle.setWidth(Double.parseDouble(jTextField2.getText()));
					field1.setText(String.valueOf(rectangle.Rectangle_Girth()));
					field2.setText(String.valueOf(rectangle.Rectangle_Space()));
				}
			}
		});
		jButton2.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				flag = jTextField4;
				jTextField1.setText("");
				jTextField2.setText("");
				field1.setText("");
				field2.setText("");
			}
		});
		JPanel jp2 = new JPanel();
		jp2.add(jButton1);
		jp2.add(jButton2);
		jp.add(jp11);
		jp.add(jp2);
		jp.add(jp33);
		
		jPanel.add(jp);
		//jPanel.add(getKeyBoard());
		return jPanel;
	}
	/**
	 * 圆的基本运算
	 * @return
	 */
	public JPanel getCircleView() {
		JPanel jPanel = new JPanel();
		JLabel jLabel1 = new JLabel("请输入圆的半径：");
		JButton jButton1 = new JButton("计算结果：");
		JButton jButton2 = new JButton("清空");
		//jPanel.setLayout(new GridLayout(1,2));
		JPanel jp = new JPanel();
		jp.setLayout(new GridLayout(6,1));
		JPanel jp1 = new JPanel();
		jp1.setLayout(new GridLayout(1,2));
		jp1.add(jLabel1);
		jp1.add(jTextField1);
		jTextField1.setText("");
		JPanel jp11 = new JPanel();
		jp11.add(jp1);
		JPanel jp3 = new JPanel();
		JTextField field1 = new JTextField();
		JTextField field2 = new JTextField();
		jp3.setLayout(new GridLayout(2,2));
		jp3.add(new JLabel("圆的周长为："));
		jp3.add(field1);
		jp3.add(new JLabel("圆的面积为："));
		jp3.add(field2);
		JPanel jp33 = new JPanel();
		jp33.add(jp3);
		jButton1.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				flag = jTextField4;
				System.out.println(jTextField1.getText());
				if(!jTextField1.getText().trim().equals("")&& 
						!jTextField1.getText().isEmpty()) {
					Circle circle = new Circle();
					circle.setR(Double.parseDouble(jTextField1.getText()));
					field1.setText(String.valueOf(circle.Circle_Girth()));
					field2.setText(String.valueOf(circle.Circle_Space()));
				}
			}
		});
		jButton2.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				flag = jTextField4;
				jTextField1.setText("");
				field1.setText("");
				field2.setText("");
			}
		});
		JPanel jp2 = new JPanel();
		jp2.add(jButton1);
		jp2.add(jButton2);
		jp.add(jp11);
		jp.add(jp2);
		jp.add(jp33);
		jPanel.add(jp);
		//jPanel.add(getKeyBoard());
		return jPanel;
	}
	/**
	 * 三角形的基本运算
	 * @return
	 */
	public JPanel getTriangleView() {
		JPanel jPanel = new JPanel();
		JLabel jLabel1 = new JLabel("请输入三角形的边：");
		JLabel jLabel2 = new JLabel("请输入三角形的边：");
		JLabel jLabel3 = new JLabel("请输入三角形的边：");
		JButton jButton1 = new JButton("计算结果：");
		JButton jButton2 = new JButton("清空");
		//jPanel.setLayout(new GridLayout(1,2));
		JPanel jp = new JPanel();
		jp.setLayout(new GridLayout(4,1));
		JPanel jp1 = new JPanel();
		jp1.setLayout(new GridLayout(3,2));
		jp1.add(jLabel1);
		/**
		 *将JTextFiled初始化为空
		 * 
		 * 
		 */
		jp1.add(jTextField1);
		jTextField1.setText("");
		jp1.add(jLabel2);
		jp1.add(jTextField2);
		jTextField2.setText("");
		jp1.add(jLabel3);
		jp1.add(jTextField3);
		jTextField3.setText("");
		JPanel jp11 = new JPanel();
		jp11.add(jp1);
		JPanel jp3 = new JPanel();
		JTextField field1 = new JTextField();
		JTextField field2 = new JTextField();
		jp3.setLayout(new GridLayout(2,2));
		jp3.add(new JLabel("三角形的周长为："));
		jp3.add(field1);
		jp3.add(new JLabel("三角形的面积为："));
		jp3.add(field2);
		JPanel jp33 = new JPanel();
		jp33.add(jp3);
		jButton1.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				flag = jTextField4;
				System.out.println(jTextField1.getText());
				System.out.println(jTextField2.getText());
				if(!jTextField1.getText().trim().equals("")&& 
						!jTextField1.getText().isEmpty() && 
						!jTextField2.getText().trim().equals("") &&
						!jTextField2.getText().trim().isEmpty() &&
						!jTextField3.getText().trim().equals("") &&
						!jTextField3.getText().trim().isEmpty()) {
					Triangle triangle = new Triangle();
				
					triangle.setA(Double.parseDouble(jTextField1.getText()));
					triangle.setB(Double.parseDouble(jTextField2.getText()));
					triangle.setC(Double.parseDouble(jTextField3.getText()));
					if(!triangle.isTriangle()){
						JOptionPane.showMessageDialog(null, "非三角形！", "标题【出错啦】", JOptionPane.ERROR_MESSAGE);
					}
					else{
				
					field1.setText(String.valueOf(triangle.Triangle_Girth()));
					field2.setText(String.valueOf(triangle.Triangle_Space()));
					}
				}
			}
		});
		jButton2.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				flag = jTextField4;
				jTextField1.setText("");
				jTextField2.setText("");
				jTextField3.setText("");
				field1.setText("");
				field2.setText("");
			}
		});
		JPanel jp2 = new JPanel();
		jp2.add(jButton1);
		jp2.add(jButton2);
		jp.add(jp11);
		jp.add(jp2);
		jp.add(jp33);
		jPanel.add(jp);
		//jPanel.add(getKeyBoard());
		return jPanel;
	}
	/**
	 * 圆柱的基本运算
	 * @return
	 */
	public JPanel getColumnView() {
		JPanel jPanel = new JPanel();
		JLabel jLabel1 = new JLabel("请输入圆柱的半径：");
		JLabel jLabel2 = new JLabel("请输入圆柱的高：");
		JButton jButton1 = new JButton("计算结果：");
		JButton jButton2 = new JButton("清空");
		//jPanel.setLayout(new GridLayout(1,2));
		JPanel jp = new JPanel();
		jp.setLayout(new GridLayout(4,1));
		JPanel jp1 = new JPanel();
		jp1.setLayout(new GridLayout(2,2));
		jp1.add(jLabel1);
		jp1.add(jTextField1);
		jTextField1.setText("");
		jp1.add(jLabel2);
		jp1.add(jTextField2);
		jTextField2.setText("");
		JPanel jp11 = new JPanel();
		jp11.add(jp1);
		JPanel jp3 = new JPanel();
		JTextField field1 = new JTextField();
		JTextField field2 = new JTextField();
		JTextField field3 = new JTextField();
		jp3.setLayout(new GridLayout(3,2));
		jp3.add(new JLabel("圆柱的底面积为："));
		jp3.add(field1);
		jp3.add(new JLabel("圆柱的表面积为："));
		jp3.add(field2);
		jp3.add(new JLabel("圆柱的体积为："));
		jp3.add(field3);
		JPanel jp33 = new JPanel();
		jp33.add(jp3);
		jButton1.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				flag = jTextField4;
				System.out.println(jTextField1.getText());
				System.out.println(jTextField2.getText());
				if(!jTextField1.getText().trim().equals("")&& 
						!jTextField1.getText().isEmpty() && 
						!jTextField2.getText().trim().equals("") &&
						!jTextField2.getText().trim().isEmpty()) {
					Column column= new Column();
				
					column.setR(Double.parseDouble(jTextField1.getText()));
					column.setH(Double.parseDouble(jTextField2.getText()));
					field1.setText(String.valueOf(column.Column_bottom_Space()));
					field2.setText(String.valueOf(column.Column_Surface_Space()));
					field3.setText(String.valueOf(column.Column_Volume()));
				}
			}
		});
		jButton2.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				flag = jTextField4;
				jTextField1.setText("");
				jTextField2.setText("");
				field1.setText("");
				field2.setText("");
				field3.setText("");
			}
		});
		JPanel jp2 = new JPanel();
		jp2.add(jButton1);
		jp2.add(jButton2);
		jp.add(jp11);
		jp.add(jp2);
		jp.add(jp33);
		jPanel.add(jp);
		//jPanel.add(getKeyBoard());
		return jPanel;
	}
	/**
	 * 构造方法
	 */
	public Main() {
		jTextField1 = new JTextField();
		jTextField2 = new JTextField();
		jTextField3 = new JTextField();
		jTextField4 = new JTextField();
		Panel = new JPanel();
		//焦点监听器
		jTextField1.addFocusListener(new FocusListener() {
			
			@Override
			public void focusLost(FocusEvent e) {
			}
			
			@Override
			public void focusGained(FocusEvent e) {
				flag = jTextField1;
				
			}
		});
		jTextField2.addFocusListener(new FocusListener() {
			
			@Override
			public void focusLost(FocusEvent e) {
			}
			
			@Override
			public void focusGained(FocusEvent e) {
				flag = jTextField2;
				
			}
		});
		jTextField3.addFocusListener(new FocusListener() {
			
			@Override
			public void focusLost(FocusEvent e) {
			}
			
			@Override
			public void focusGained(FocusEvent e) {
				flag = jTextField3;
				
			}
		});
		flag = jTextField4;
		Panel.add(getMainView());
		this.setLayout(new BorderLayout());
		this.add(getJComboBox(),"North");
		this.add(Panel,"Center");
		jp = new JPanel();
		jp.add(getKeyBoard());
		jp.setVisible(false);
		this.add(jp,"East");
		this.setResizable(false);												//不可改变大小
		this.setTitle("常见几何图形的计算器");													//设置标题
		this.setSize(600, 320);
		Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
		this.setLocation((size.width-this.getWidth())/2,(size.height-this.getHeight())/2);//设置位置
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
		
		
	}
	
	
	@Override
	// 点击监听器
	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand()=="1"){
			if(flag.getText().equals("0")) {
				flag.setText("1");
			}else {
				flag.setText(flag.getText()+"1");
			}
		} else if(e.getActionCommand()=="2"){
			if(flag.getText().equals("0")) {
				flag.setText("2");
			}else {
				flag.setText(flag.getText()+"2");
			}
		} else if(e.getActionCommand()=="3"){
			if(flag.getText().equals("0")) {
				flag.setText("3");
			}else {
				flag.setText(flag.getText()+"3");
			}
		} else if(e.getActionCommand()=="4"){
			if(flag.getText().equals("0")) {
				flag.setText("4");
			}else {
				flag.setText(flag.getText()+"4");
			}
		} else if(e.getActionCommand()=="5"){
			if(flag.getText().equals("0")) {
				flag.setText("5");
			}else {
				flag.setText(flag.getText()+"5");
			}
		} else if(e.getActionCommand()=="6"){
			if(flag.getText().equals("0")) {
				flag.setText("6");
			}else {
				flag.setText(flag.getText()+"6");
			}
		} else if(e.getActionCommand()=="7"){
			if(flag.getText().equals("0")) {
				flag.setText("7");
			}else {
				flag.setText(flag.getText()+"7");
			}
		} else if(e.getActionCommand()=="8"){
			if(flag.getText().equals("0")) {
				flag.setText("8");
			}else {
				flag.setText(flag.getText()+"8");
			}
		} else if(e.getActionCommand()=="9"){
			if(flag.getText().equals("0")) {
				flag.setText("9");
			}else {
				flag.setText(flag.getText()+"9");
			}
		} else if(e.getActionCommand()=="0"){
			if(!flag.getText().equals("0")) {
				flag.setText(flag.getText()+"0");
			}
		} else if(e.getActionCommand()=="."){
			if(flag.getText().equals("")) {
				flag.setText(flag.getText()+"0.");
			}
			if(flag.getText().indexOf(".") == -1) {
				flag.setText(flag.getText()+".");
			}
		} else if(e.getActionCommand()=="BackSpace"){
			if(!flag.getText().equals("")) {
				flag.setText(flag.getText().substring(0, flag.getText().length()-1));
			}
		}
	}
	public static void main(String[] args) {
		new Main();
	}
}

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