第4次作业类测试代码+163+张玉洁

1.类图：

2.结果：

3.代码及界面：

package test;
public class Triangle {    
    public String triangle(int a,int b,int c){
        String str=null;
        if(a+b>c){
            if((a == b)||(b == c)&&(a!=c))
            {
                str = "等腰三角形";
            }
            else if(a == b&& b== c)
            {
                str = "等边三角形";
            }else if(a*a+b*b==c*c){
                str = "直角三角形";
            }else
                str="一般三角形";    
            }
            else {
                str = "不构成三角形";
            }
            return str;
    }
    public float triangleArea(int a,int b,int c){
        float p=(a+b+c)/2;
        float s=(float)Math.sqrt(p*(p-a)*(p-b)*(p-c));
        return s;
    }    
    public  int Perimeter(int a,int b,int c){
        return a+b+c;
    }
}

界面代码：

package test;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.WindowEvent; 
import java.util.Arrays;
import java.awt.event.WindowAdapter; 

public class FrameTriangle {
    private JFrame frame = new JFrame("三角形计算程序");
    private JButton b1 = new JButton("OK");
    private JButton b2 = new JButton("Cancel");
    private JLabel lab1 = new JLabel("请输入三角形的三条边：");
    private JLabel length1 = new JLabel("a:");
    private JLabel length2 = new JLabel("b:");
    private JLabel length3 = new JLabel("c:");
    private JLabel define = new JLabel("这个三角形是：");
    private JLabel area = new JLabel("面积是:");
    private JLabel perimeter = new JLabel("周长是:");
    private JTextField a = new JTextField();
    private JTextField b = new JTextField();
    private JTextField c = new JTextField();
    private JTextField judge = new JTextField();
    private JTextField s = new JTextField();
    private JTextField per = new JTextField();
    Triangle t=new Triangle();
    public FrameTriangle(){
        b1.addActionListener(new ActionListener(){
        @Override
            public void actionPerformed(ActionEvent e){
                try{
                    int[] num;
                    num = new int[3];
                    num[0]=Integer.parseInt(a.getText());
                    num[1]=Integer.parseInt(b.getText());
                    num[2]=Integer.parseInt(c.getText());
                    if(num[0]>100||num[0]<1||num[1]>100||num[1]<1||num[2]>100||num[2]<1){
                        JOptionPane.showMessageDialog(null,"边的值不在范围内");
                        return;
                    }
                    Arrays.sort(num);
                    judge.setText(t.triangle(num[0],num[1],num[2]));
                    s.setText(""+t.triangleArea(num[0],num[1],num[2]));
                    per.setText(""+t.Perimeter(num[0],num[1],num[2]));
                }catch(Exception ex){
                    JOptionPane.showMessageDialog(null,"请输入整数");
                 }
           }
       });
       b2.addActionListener(new ActionListener(){
           @Override
           public void actionPerformed(ActionEvent e) {
           a.setText("");
           b.setText("");
           c.setText("");
           judge.setText("");
           s.setText("");
           per.setText("");
       }});
       frame.addWindowListener(new WindowAdapter(){
           public void windowClosing(WindowEvent e){
               System.exit(1);
           }
       });
       frame.setLayout(null);
       lab1.setBounds(55,10,350,30);
       length1.setBounds(55,60,30,15);
       length2.setBounds(145,60,30,15);
       length3.setBounds(225,60,30,15);
       define.setBounds(55,130,300,30);
       area.setBounds(55,180,50,20);
       perimeter.setBounds(180,180,50,20);
       a.setBounds(70,55,50,25);
       b.setBounds(160,55,50,25);
       c.setBounds(240,55,50,25);
       judge.setBounds(140,130,150,30);
       s.setBounds(100,180,55,25);
       per.setBounds(230,180,55,25);
       b1.setBounds(55,90,100,30);
       b2.setBounds(175,90,100,30);
       frame.add(lab1);
       frame.add(length1);
       frame.add(length2);
       frame.add(length3);
       frame.add(define);
       frame.add(area);
       frame.add(perimeter);
       frame.add(a);
       frame.add(b);
       frame.add(c);
       frame.add(judge);
       frame.add(s);
       frame.add(per);
       frame.add(b1);
       frame.add(b2);
       frame.setSize(500,400);
       frame.setVisible(true);    
    }                 
    public static void main(String[] args){
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try{
                    FrameTriangle window = new FrameTriangle();
                    window.frame.setVisible(true);
                    }catch (Exception e){
                        e.printStackTrace();
                     }
            }
        });
    }    
}