第4次作业类测试代码+052+张博勋

1.类图

2.代码

三角形demo类：

package zbx_ruance4;

import java.util.*;
public class Demo {
    public static String triangle(int a,int b,int c){
        String result;
     if( a>=1 &&a<=100&&b>=1&&b<=100&&c>=1&&c<=100){
            if(a<b+c &&b<a+c&& c<a+b){
                if(a==b || a==c||b==c){
                    if(a==b &&b==c&&a==c)
                    result = "等边三角形";
                    else
                    result = "等腰三角形";                      
                }else if(a*a+b*b==c*c || b*b+c*c==a*a || a*a+c*c==b*b){
                    result = "直角三角形";
                }else{
                    result = "一般三角形";
                }  
            }else{
                result = "不构成三角形";
            }
        }else{
            result = "边的值不在范围内！";
        }
     return result;
    }
    public static void main(String[] args) {
    System.out.println("设计三角形问题的程序");
    Scanner sc=new Scanner(System.in);
    while(true)
    {
        try{
            System.out.println("请输入三角形的三条边：");
            int a=sc.nextInt();
            int b=sc.nextInt();
            int c=sc.nextInt();
            System.out.println(triangle(a,b,c));
        }catch(Exception e){
           e.printStackTrace();
        }
  
    }
  }
    public boolean Validation(String[] value){
        if(value.length<3){//输入数据不是3个
            return false;
        }
        try {
            for(int i=0;i<3;i++){
                int b = Integer.valueOf(value[i]).intValue();
            }
        } catch (NumberFormatException e){//整形转换异常
            return false;
        }
        return true;
    }
    public int perimeter(int a,int b,int c){
        return a+b+c;
}
public float triangleArea(int a,int b,int c){
        float s = (float) (0.5*perimeter( a, b, c));
        return (float) Math.sqrt((s*(s-a)*(s-b)*(s-c)));
	}
}

　测试窗体类：Frame　

package zbx_ruance4;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import zbx_ruance4.Demo;
import javax.swing.JFrame;

 
public class Frame{
    private JFrame frame;   
    private final JLabel label = new JLabel("请输入三角形三边：");
    private final JLabel lab_a = new JLabel("请输入a:");
    private final JLabel lab_b = new JLabel("请输入b:");
    private final JLabel lab_c = new JLabel("请输入c:");
    private final JLabel result_1 = new JLabel("");
    private final JLabel result_2 = new JLabel("面积是：       周长是：");
     
    private final JTextField text_a = new JTextField();
    private final JTextField text_b = new JTextField();
    private final JTextField text_c = new JTextField();
     
    private final JButton btn_ok = new JButton("确定");
    private final JButton btn_clean = new JButton("清空");
    private Demo tri;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    new Frame();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
 
    public Frame() {
        frame = new JFrame("三角形计算程序");
        frame.setBounds((Toolkit.getDefaultToolkit().getScreenSize().width/2)-256, (Toolkit.getDefaultToolkit().getScreenSize().height/2)-192, 450, 360);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);
        frame.setVisible(true);
        frame.setResizable(false);
 
        label.setFont(new Font("体", Font.PLAIN, 14));
        label.setBounds(24, 10, 350, 30);
        frame.getContentPane().add(label);
        result_1.setFont(new Font("宋体", Font.PLAIN, 14));
        result_1.setBounds(24, 192, 350, 30);
        frame.getContentPane().add(result_1);
        result_2.setFont(new Font("宋体", Font.PLAIN, 14));
        result_2.setBounds(24, 254, 350, 30);
        frame.getContentPane().add(result_2);
         
        lab_a.setFont(new Font("宋体", Font.PLAIN, 14));
        lab_a.setBounds(60, 70, 60, 25);
        lab_b.setFont(new Font("宋体", Font.PLAIN, 14));
        lab_b.setBounds(60, 100, 60, 25);
        lab_c.setFont(new Font("宋体", Font.PLAIN, 14));
        lab_c.setBounds(60, 130, 60, 25);
        frame.getContentPane().add(lab_a);
        frame.getContentPane().add(lab_b);
        frame.getContentPane().add(lab_c);
         
        text_a.setBounds(200, 70, 60, 25);
        text_b.setBounds(200, 100, 60, 25);
        text_c.setBounds(200, 130, 60, 25);
        text_a.setColumns(10);      
        text_b.setColumns(10);
        text_c.setColumns(10);
        frame.getContentPane().add(text_a);
        frame.getContentPane().add(text_b);
        frame.getContentPane().add(text_c);
         
        btn_ok.setBounds(110, 180, 95, 25);
        frame.getContentPane().add(btn_ok);
        btn_clean.setBounds(240, 180, 95, 25);
        frame.getContentPane().add(btn_clean);
         
        btn_ok.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent arg0){
                if(arg0.getSource()==btn_ok){
                    tri = new Demo();
                    String[] value = new String[3];
                    value[0] = text_a.getText();
                    value[1] = text_b.getText();
                    value[2] = text_c.getText();
                    if(!tri.Validation(value)){//调用验证函数捕获异常
                        JOptionPane.showMessageDialog(null, "请确保输入的边为整数！", "错误", JOptionPane.ERROR_MESSAGE);
                        allClean();
                    }
                    else{
                        int a = Integer.valueOf(value[0]).intValue();
                        int b = Integer.valueOf(value[1]).intValue();
                        int c = Integer.valueOf(value[2]).intValue();
                        String triangleType = tri.triangle(a,b,c);
                        result_1.setText(triangleType);
                        if(triangleType.equals("边的值不在范围内！")){
                            JOptionPane.showMessageDialog(null, "边的值不在范围内！", "错误", JOptionPane.ERROR_MESSAGE);
                            allClean();
                        }else if(triangleType.equals("不能构成三角形.")){
                            JOptionPane.showMessageDialog(null, "不能构成三角形.", "错误", JOptionPane.ERROR_MESSAGE);
                            allClean();
                        }else{
                        
                        result_2.setText("面积是："+tri.triangleArea(a, b, c)+"     周长是："+tri.perimeter(a, b, c));
                    }
                    }
                }
            }
        });
         
        btn_clean.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent arg0){
                if(arg0.getSource()==btn_clean){
                     allClean();//qingkong
                }
            }
        });
    }
     
    private void allClean(){
        text_a.setText("");
        text_b.setText("");
        text_c.setText("");
        result_1.setText("类型：");
        result_2.setText("面积是：       周长是：");
    }
}

　　

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