package swingDesign;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Triangle extends JFrame {

    private JPanel contentPane;
    private JTextField aside;
    private JTextField bside;
    private JTextField cside;
    private JTextField resulttext;
    private JTextField square;
    private JTextField length;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Triangle frame = new Triangle();
                    frame.getContentPane().setLayout(null);
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public Triangle() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setLayout(null);
        setContentPane(contentPane);
        
        JLabel lab = new JLabel("\u8BF7\u8F93\u5165\u4E09\u89D2\u5F62\u7684\u4E09\u6761\u8FB9\uFF1A");
        lab.setFont(new Font("黑体", Font.PLAIN, 14));
        contentPane.add(lab);
        lab.setBounds(129, 10, 196, 32);
        
        JLabel laba = new JLabel("a:");
        laba.setFont(new Font("黑体", Font.PLAIN, 14));
        contentPane.add(laba);
        laba.setBounds(64, 73, 36, 23);
        
        JLabel labb = new JLabel("b:");
        labb.setFont(new Font("黑体", Font.PLAIN, 14));
        labb.setBounds(187, 73, 36, 23);
        contentPane.add(labb);
        
        JLabel labc = new JLabel("c:");
        labc.setFont(new Font("黑体", Font.PLAIN, 14));
        labc.setBounds(307, 73, 36, 23);
        contentPane.add(labc);
        
        aside = new JTextField();
        aside.setBounds(84, 73, 66, 21);
        contentPane.add(aside);
        aside.setColumns(10);
        
        bside = new JTextField();
        bside.setBounds(206, 73, 66, 21);
        contentPane.add(bside);
        bside.setColumns(10);
        
        cside = new JTextField();
        cside.setBounds(329, 73, 66, 21);
        contentPane.add(cside);
        cside.setColumns(10);
        
        final JButton btnOk = new JButton("OK");
        btnOk.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                 if(e.getSource()==btnOk)
                                      {
                                          Caculate cacu =new Caculate();
                                          int a=0,b=0,c=0;
                                          String A,B,C;
                                          A=aside.getText().toString();
                                          B=bside.getText().toString();
                                          C=cside.getText().toString();
                                         
                                          //判断是否为数字
                                          if(A.matches("[0-9]+") && B.matches("[0-9]+") && C.matches("[0-9]+"))
                                         {                                              
                                             a = Integer.parseInt(A);
                                             b = Integer.parseInt(B);
                                             c = Integer.parseInt(C);
                                             resulttext.setText(cacu.triangle(a,b,c));
                                             square.setText(cacu.square(a,b,c)+"");
                                             length.setText(cacu.length(a,b,c)+"");
                                         }
                                         else
                                          {
                                              resulttext.setText("输入有误，请重新输入");
                                          }
                                     }
            }
        });
        btnOk.setFont(new Font("宋体", Font.PLAIN, 14));
        btnOk.setBounds(118, 119, 79, 23);
        contentPane.add(btnOk);
        
        final JButton btnCancel = new JButton("CANCEL");
        btnCancel.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if(e.getSource()==btnCancel)
                {
                    aside.setText("");
                    bside.setText("");
                    cside.setText("");
                    resulttext.setText("");
                    square.setText("");
                    length.setText("");
                     JOptionPane.showMessageDialog(null,"已重置");
                }
            }
        });
        btnCancel.setFont(new Font("宋体", Font.PLAIN, 14));
        btnCancel.setBounds(246, 119, 79, 23);
        contentPane.add(btnCancel);
        
        JLabel label = new JLabel("\u8FD9\u4E2A\u4E09\u89D2\u5F62\u662F:");
        label.setFont(new Font("宋体", Font.PLAIN, 14));
        label.setBounds(84, 164, 113, 23);
        contentPane.add(label);
        
        resulttext = new JTextField();
        resulttext.setBounds(183, 165, 136, 21);
        contentPane.add(resulttext);
        resulttext.setColumns(10);
        
        JLabel label_1 = new JLabel("\u9762\u79EF\u662F:");
        label_1.setFont(new Font("宋体", Font.PLAIN, 14));
        label_1.setBounds(64, 208, 54, 15);
        contentPane.add(label_1);
        
        square = new JTextField();
        square.setBounds(111, 205, 66, 21);
        contentPane.add(square);
        square.setColumns(10);
        
        JLabel label_2 = new JLabel("\u5468\u957F\u662F:");
        label_2.setFont(new Font("宋体", Font.PLAIN, 14));
        label_2.setBounds(233, 208, 54, 15);
        contentPane.add(label_2);
        
        length = new JTextField();
        length.setBounds(283, 205, 66, 21);
        contentPane.add(length);
        length.setColumns(10);
    }
}

package swingDesign;

import java.text.DecimalFormat;

public class Caculate {
       
    public final static int DENGBIAN = 0;
    public final static int DENGYAO  = 1;
    public final static int ZHIJIAO  = 2;
    public final static int YIBAN    = 3;
     
    private int a;
    private int b;
    private int c;
     
    protected int checkType()//判断三角形种类
    {
        if(a==b&&a==c&&b==c)
            return DENGBIAN;
        if(a==b||a==c||b==c)
            return DENGYAO;
        if(a*a+b*b==c*c||a*a==b*b+c*c||b*b==a*a+c*c)
            return ZHIJIAO;
        return YIBAN;
    }
     
    protected boolean checkTheOne()//检查范围条件
     {
         if((a>=1&&a<=100)&&(b>=1&&b<=100)&&(c>=1&&c<=100))
             return true;
         else
             return false; 
     } 
     
    protected boolean checkTheTwo()//检查是否组成三角形
     {
         if((a<(b+c))&&(b<(a+c))&&(c<(a+b)))
             return true;
         else
             return false;
     }
     
    public String triangle( int a, int b, int c)//题目要求的函数
     {
        String ch = null;
        this.a = a;
        this.b = b;
        this.c = c;
         
        if(!checkTheOne())
        {
            ch = "边的值不在范围内";
        }
        else if(!checkTheTwo())
        {
            ch = "不构成三角形";
        }
        else
        {
            switch(checkType())
            {
            case DENGBIAN:      ch = "等边三角形";break;
            case DENGYAO:       ch = "等腰三角形";break;
            case ZHIJIAO:       ch = "直角三角形";break;
            case YIBAN:         ch = "一般三角形";break;
            }
        }
        return ch;
     }
     
    public String square(int a,int b,int c)
    {
        String temp = triangle(a, b, c);
        DecimalFormat df = new DecimalFormat("#.00");
        float result=0;        
        float p;    
        String mianjiresult = null;
        if(!temp.equals("边的值不在范围内") &&!temp.equals("不构成三角形"))
        {
            p=(float) ((a+b+c)/2.0);
            result=(float) (Math.sqrt(p*(p-a)*(p-b)*(p-c)));
            mianjiresult=df.format(result);
        }          
        return mianjiresult;
    }
              
    public int length(int a,int b,int c)
    {
        String temp = triangle(a, b, c);
        int result=0;
        if(!temp.equals("边的值不在范围内") &&!temp.equals("不构成三角形"))
        {
            result=a+b+c;
        }
        return result;
   
    }
}