自己编写的一个java简单的窗口实现两点求园面积

package Circle; public class test { @SupPRessWarnings("unused") public static void main(String[] args) { // TODO Auto-generated method stub Getdata data =new Getdata(); }

}//主方法

//点类

package Circle; public class Point { public double x,y; double getLance(Point p1,Point p2){ double lance = Math.sqrt((p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y)); return lance; } void setXY(double i,double j){ x=i; y=j; } public Point(double i,double j){ x=i; y=j; } }

//圆类，继承点类

package Circle; public class Circlearea extends Point { double r; public Circlearea(){ super(0,0);//调用父类的构造方法 } public double getarea(Point p1,Point p2){ r=Math.sqrt((p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y)); double area=3.14*r*r; return area; } }

//窗体显示类

package Circle; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.*; /** * @author admin * wirte win * */ public class Getdata extends Frame{ /** * */ private static final long serialVersionUID = 6165187708490829110L; TextField text1=new TextField(5); TextField text2=new TextField(5); TextField text3=new TextField(5); TextField text4=new TextField(5); Button button1=new Button("确认计算"); Button button2=new Button("清零");// public Getdata() { super("计算"); setLocationRelativeTo(null); setLayout(new FlowLayout()); add(new JLabel("第一个点xy坐标")); add(text1); add(text2); add(new JLabel("第二个点xy坐标")); add(text3); add(text4); add(button1); add(button2);// button2.setBackground(Color.lightGray); addWindowListener(new WindowCloser()); pack(); setVisible(true); button1.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { if(e.getSource() == button1) { double a,b,c,d; a=Double.parseDouble(text1.getText()); b=Double.parseDouble(text2.getText()); c=Double.parseDouble(text3.getText()); d=Double.parseDouble(text4.getText()); System.out.println(a); Point p1=new Point(a,b); Point p2=new Point(c,d); System.out.println(p1.toString()); Circlearea cir=new Circlearea(); double f=cir.getarea(p1, p2); String str =Double.toString(f); showAnswer(str); } else{ System.out.print("出错"); } } } ); button2.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { if(e.getSource() == button2) { text1.setText(""); text2.setText(""); text3.setText(""); text4.setText(""); } else{ System.out.print("出错"); } } } ); setWindowIcon();// } /* * 图标修改,shift alt j */ public void setWindowIcon() // { ImageIcon imageIcon = new ImageIcon(getClass().getResource("/img/ico.png")); this.setIconImage(imageIcon.getImage()); } private class WindowCloser extends WindowAdapter{ public void windowClosing(WindowEvent we) { System.exit(0); } } public void showAnswer(String str){ JOptionPane.showMessageDialog(null, "结果为："+str,"结果",JOptionPane.INFORMATION_MESSAGE); } }