java第十三周实验编写一个一元二次函数的GUI

EquationFrame:

package net.kk;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class EquationFrame extends JFrame implements ActionListener
{
    String a,b,c,x,y;
    TextArea textArea;
 TextField text1,text2,text3;
 Button button;
 Label la1,la2,la3;
private Object SquaraEquation;
 EquationFrame(String s)
 {
  super(s);
  setLayout(new FlowLayout()); 
  
  text1 = new TextField();
  text2 = new TextField();
  text3 = new TextField();

  textArea = new   TextArea (5,28);
  
  button = new Button("确定");
  la1 = new Label("一次项系数");
  la2 = new Label("二次项系数");
  la3 = new Label("常数项");

  button.addActionListener( this);
  add(la1);
  add(text1);
  add(la2);
  add(text2);
  add(la3);
  add(text3);
  add(button);
  add(textArea);
  
  setBounds(100, 100, 400, 200);
  setVisible(true);
  validate();
  
  
 }
 
 


 @Override
 public void actionPerformed(ActionEvent e) {
  
  if(e.getSource() == button)
  {
 a= text1.getText();
  b =text2.getText();
     c =text3.getText();
     textArea.setText((String.valueOf(SquareEquation.jisuan(Integer.parseInt(a), Integer.parseInt(b), Integer.parseInt(c)))));
  }
  
 }

}


 

SquareEquation

package net.kk;

import java.lang.*;
import java.awt.*;

public class  SquareEquation 
{

   
 public static String jisuan(int a,int b,int c)
 {
   double x;
  double y;
  if(b*b - 4 * a *c <0)
  {
   return "没有实根,函数无解";
  }
  else
  {
   x = (-b + Math.sqrt(b*b - 4*a*c))/(2*a) ;
   y = (-b - Math.sqrt(b*b - 4*a*c))/(2*a) ;
   return "函数有解且函数的解是\n"+"x = "+x+"   和     "+"y = "+y;
  
   
  }
 }
}

Text2

package net.kk;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class Text2 {
 public static void main(String args[])
 {
  new EquationFrame("黑子是屌丝");
 }

}

上机感言：  这次真心好开心  哈哈哈哈