java图形界面（七）---组件综合练习

【题目】java图形界面（七）--- 组件综合练习

【时间】2020.05.21 周四

 

目录

七、组件综合练习

7.1 练习-为空判断.

7.2 练习-数字校验.

7.3 练习-账号密码验证.

7.4 练习-黄鹤.

7.5 练习-复利计算器.

7.6 练习-进度条.

7.7 练习-显示文件夹复制进度条.

---

 

这是how2Java网站的【图形界面】--组件综合练习 答案

主要参考评论区，可能存在bug。

链接：（七）组件综合练习

 

 

七、组件综合练习

 

7.1 练习-为空判断.

在JTextField中输入数据，在旁边加一个按钮JButton,当点击按钮的时候，判断JTextFiled中有没有数据，并使用JOptionPane进行提示。

1、JButton事件响应：actionPerformed(ActionEvent e)

2、JTextFiled组件内容获取

3、JOptionPane弹窗组件使用。

JOptionPane.showMessageDialog(jf,"内容");

 

代码：

package gui;

import javax.swing.*;
import java.awt.*;
import java.sql.*;

public class TestGUI {
    public static void main(String[] args){
        JFrame jf = new JFrame("LOL");
        jf.setSize(416,300);
        jf.setLocation(500,300);
        jf.setLayout(null);

        JPanel jp = new JPanel();
        jp.setBounds(8,8,400,300);
        jp.setLayout(new FlowLayout());

        JTextField content = new JTextField("");
        content.setPreferredSize(new Dimension(80,30));

        JButton jb = new JButton("检测");
        jb.setSize(50,30);
        jb.addActionListener(e->{
            String cont = content.getText();
            if(cont.isEmpty()){
              
                 
                        JOptionPane.showMessageDialog(jf,"文本内容为空");}
            else{
                        JOptionPane.showMessageDialog(jf,"文本内容为:"+cont);
                    }
           
        });
       
        jp.add(content);
        jp.add(jb);

        jf.add(jp);


        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);
    }

}

 

 

7.2 练习-数字校验.

在JTextField中输入数据，在旁边加一个按钮JButton,当点击按钮的时候，判断JTextFiled中的数据是否是数字，并使用JOptionPane进行提示

判断是否为数字： https://blog.csdn.net/qq_42133100/article/details/92158507?

public static boolean isNumeric(String str){
    Pattern pattern = Pattern.compile("[0-9]*");
    return pattern.matcher(str).matches();   
}

 

              

 

代码：

package gui;

import javax.swing.*;
import java.awt.*;
import java.sql.*;
import java.util.regex.Pattern;

public class TestGUI {
     public static boolean isNumeric(String str){
         Pattern pattern = Pattern.compile("[0-9]*");
         return pattern.matcher(str).matches();  
     }
    public static void main(String[] args){
        JFrame jf = new JFrame("LOL");
        jf.setSize(416,300);
        jf.setLocation(500,300);
        jf.setLayout(null);

        JPanel jp = new JPanel();
        jp.setBounds(8,8,400,300);
        jp.setLayout(new FlowLayout());

        JTextField content = new JTextField("");
        content.setPreferredSize(new Dimension(80,30));

        JButton jb = new JButton("检测");
        jb.setSize(50,30);
        jb.addActionListener(e->{
            String cont = content.getText();
            if(cont.isEmpty()) {
                        JOptionPane.showMessageDialog(jf,"输入框内容为空");}
            else{
                 if(isNumeric(cont))
                        JOptionPane.showMessageDialog(jf,"输入框内容是数字:"+cont);
                 else
                       JOptionPane.showMessageDialog(jf,"输入框内容不是数字");
                    }
           
        });
       
        jp.add(content);
        jp.add(jb);

        jf.add(jp);


        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);
    }

}

 

7.3 练习-账号密码验证.

准备两个JTextFiled,一个用于输入账号，一个用于输入密码。

使用密码框：

    JPasswordField pf = new JPasswordField("");

再准备一个JButton，上面的文字是登陆

点击按钮之后，首先进行为空判断，如果都不为空，则把账号和密码，拿到数据库中进行比较(SQL语句判断账号密码是否正确)，根据判断结果，使用JOptionPane进行提示。

 

代码：

package gui;

import javax.swing.*;
import java.awt.*;
import java.sql.*;

public class TestGUI {
    private static String url = "jdbc:mysql://127.0.0.1:3306/how2java?characterEncoding=UTF-8";
    private static String Name = "root";
    private static String Pwd = "root";

    public static void main(String[] args){

        try {
            Class.forName("com.mysql.jdbc.Driver");
        }catch (Exception e){
            e.printStackTrace();
        }

        JFrame jf = new JFrame("register");
        jf.setSize(416,300);
        jf.setLocation(500,300);
        jf.setLayout(null);

        JPanel jp1 = new JPanel();
        jp1.setBounds(8,8,400,30);
        jp1.setLayout(new FlowLayout());

        JLabel name = new JLabel("账号：");
        JTextField EnterName = new JTextField("");
        EnterName.setPreferredSize(new Dimension(80,30));
        JLabel password = new JLabel("密码：");
        JPasswordField EnterPwd = new JPasswordField("");
        EnterPwd.setPreferredSize(new Dimension(80,30));
        jp1.add(name);
        jp1.add(EnterName);
        jp1.add(password);
        jp1.add(EnterPwd);

        JPanel jp2 = new JPanel();
        jp2.setBounds(8,46,400,30);
        jp2.setLayout(new FlowLayout());

        JButton jb = new JButton("登录");
        jb.setSize(50,30);
        jb.addActionListener(e->{
            if(!EnterName.getText().isEmpty() && !EnterPwd.getText().isEmpty()){
                try(Connection conn = DriverManager.getConnection(url,Name,Pwd)){
                    String str = "select * from user where name = ? and password = ?";
                    PreparedStatement ps = conn.prepareStatement(str);
                    ps.setString(1,EnterName.getText());
                    ps.setString(2,EnterPwd.getText());
                    ResultSet rs = ps.executeQuery();
                    if(rs.next()){
                        JOptionPane.showMessageDialog(jf,"登录成功");
                    }
                    else{
                        JOptionPane.showMessageDialog(jf,"账户名或者密码错误");
                    }
                }catch (Exception ee){
                    ee.printStackTrace();
                }
            }
        });
        jp2.add(jb);


        jf.add(jp1);
        jf.add(jp2);


        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);
    }

}

 

7.4 练习-黄鹤.

把练习-黄鹤改成Swing来完成

用到组件Jlabel、JTextField、JButton

要有为空和数字判断。

 

代码：

package gui;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.regex.Pattern;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class TestGUI {
     public static boolean isNumeric(String str){
    Pattern pattern = Pattern.compile("[0-9]*");
    return pattern.matcher(str).matches();  
}
    public static void main(String[] args) {
        JFrame f=new JFrame("LOL");
        f.setSize(400,500);
        f.setLocation(500,500);
        f.setLayout(null);
        
        JPanel p1=new JPanel();
        p1.setBounds(0, 0, 90, 170);
        p1.setLayout(new FlowLayout(FlowLayout.LEFT,10,18));
        JPanel p2=new JPanel();
        p2.setBounds(80, 0, 110, 170);
        p2.setLayout(new FlowLayout(FlowLayout.LEFT,20,15));
        JPanel p3=new JPanel();
        p3.setBounds(190, 0, 80, 170);
        p3.setLayout(new FlowLayout(FlowLayout.LEFT,10,18));
        JPanel p4=new JPanel();
        p4.setBounds(260, 0, 110, 170);
        p4.setLayout(new FlowLayout(FlowLayout.LEFT,20,15));
       
        JLabel l1=new JLabel("地名：");
        JLabel l2=new JLabel("公司类型：");
        JLabel l3=new JLabel("公司名称：");
        JLabel l4=new JLabel("老板名称：");
        JLabel l5=new JLabel("金额：");
        JLabel l6=new JLabel("产品：");
        JLabel l7=new JLabel("价格计量单位：");
       
        JTextField tf1=new JTextField();
        tf1.setPreferredSize(new Dimension(90,22));
        JTextField tf2=new JTextField();
        tf2.setPreferredSize(new Dimension(90,22));
        JTextField tf3=new JTextField();
        tf3.setPreferredSize(new Dimension(90,22));
        JTextField tf4=new JTextField();
        tf4.setPreferredSize(new Dimension(90,22));
        JTextField tf5=new JTextField();
        tf5.setPreferredSize(new Dimension(90,22));
        JTextField tf6=new JTextField();
        tf6.setPreferredSize(new Dimension(90,22));
        JTextField tf7=new JTextField();
        tf7.setPreferredSize(new Dimension(90,22));
       
        p1.add(l1);p1.add(l3);p1.add(l5);p1.add(l7);
        p2.add(tf1);p2.add(tf3);p2.add(tf5);p2.add(tf7);
        p3.add(l2);p3.add(l4);p3.add(l6);
        p4.add(tf2);p4.add(tf4);p4.add(tf6);
        f.add(p1);f.add(p2);f.add(p3);f.add(p4);
        
        JButton b=new JButton("生成");
        b.setBounds(160,170,80,30);
        
        JTextArea ta=new JTextArea();
        ta.setBounds(10, 220, 365, 230);
        ta.setLineWrap(true);
        
        b.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                 if (!tf1.getText().isEmpty()&&!tf2.getText().isEmpty()&&!tf3.getText().isEmpty()&&!tf4.getText().isEmpty()&&!tf5.getText().isEmpty()&&!tf6.getText().isEmpty()&&!tf7.getText().isEmpty())
                {if (isNumeric(tf5.getText()))
                       {String str=tf1.getText()+"最大"+tf2.getText()+tf3.getText()+"倒闭了，"
                        + "王八蛋老板"+tf4.getText()+"吃喝嫖赌，欠下了"+tf5.getText()+"，"
                        + "带着他的小姨子跑了!我们没有办法，拿着"+tf6.getText()+"抵工资!"
                        + "原价都是一"+tf7.getText()+"多、两"+tf7.getText()+"多、三"+tf7.getText()+"多的"+tf6.getText()+"，"
                        + "现在全部只卖二十块，统统只要二十块!"+tf4.getText()+"王八蛋，"
                        + "你不是人!我们辛辛苦苦给你干了大半年，你不发工资，你还我血汗钱，还我血汗钱!";
                       ta.setText(str);}
                else
                  JOptionPane.showMessageDialog(f, "金额不是数字!");
                }
                 else
                       JOptionPane.showMessageDialog(f, "有内容为空!");
            }
            
        });
        
        f.add(b);
        f.add(ta);
        
        
        
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

}

 

 

7.5 练习-复利计算器.

参考练习-百万富翁，把 网页版的复利计算器 改成swing来做。

 

代码：

package gui;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class TestGUI {
    
    public static void main(String[] args) {
        JFrame f=new JFrame("LOL");
        f.setSize(420,400);
        f.setLayout(null);
        f.setLocation(450,500);
        
        JPanel p1=new  JPanel();
        p1.setBounds(0,0,100,120);
        p1.setLayout(new FlowLayout(FlowLayout.LEFT,10,11));
        JPanel p2=new  JPanel();
        p2.setBounds(135,0,130,120);
        p2.setLayout(new FlowLayout(FlowLayout.LEFT,10,9));
        JPanel p3=new  JPanel();
        p3.setBounds(270,0,25,120);
        p3.setLayout(new FlowLayout(FlowLayout.LEFT,10,11));
        
        JPanel p4=new JPanel();
        p4.setBounds(0,140,400,35);
        p4.setLayout(new FlowLayout());
        
        JPanel p5=new  JPanel();
        p5.setBounds(0,195,70,120);
        p5.setLayout(new FlowLayout(FlowLayout.LEFT,10,11));
        JPanel p6=new  JPanel();
        p6.setBounds(135,195,130,120);
        p6.setLayout(new FlowLayout(FlowLayout.LEFT,10,9));
        JPanel p7=new  JPanel();
        p7.setBounds(270,195,25,120);
        p7.setLayout(new FlowLayout(FlowLayout.LEFT,10,11));
        
        JLabel l1=new JLabel("起始资金");
        JLabel l2=new JLabel("每年收益");
        JLabel l3=new JLabel("复利年数");
        JLabel l4=new JLabel("每年追加资金");
        JLabel l5=new JLabel("￥");
        JLabel l6=new JLabel("%");
        JLabel l7=new JLabel("年");
        JLabel l8=new JLabel("￥");
        
        JLabel l9=new JLabel("本金和");
        JLabel l10=new JLabel("利息和");
        JLabel l11=new JLabel("本息和");
        JLabel l12=new JLabel("￥");
        JLabel l13=new JLabel("￥");
        JLabel l14=new JLabel("￥");
        
        JTextField tf1=new JTextField();
        tf1.setPreferredSize(new Dimension(120,20));
        JTextField tf2=new JTextField();
        tf2.setPreferredSize(new Dimension(120,20));
        JTextField tf3=new JTextField();
        tf3.setPreferredSize(new Dimension(120,20));
        JTextField tf4=new JTextField();
        tf4.setPreferredSize(new Dimension(120,20));
        
        JTextField tf5=new JTextField();
        tf5.setPreferredSize(new Dimension(120,20));
        JTextField tf6=new JTextField();
        tf6.setPreferredSize(new Dimension(120,20));
        JTextField tf7=new JTextField();
        tf7.setPreferredSize(new Dimension(120,20));
        
        JButton b=new JButton("计算");
        b.setPreferredSize(new Dimension(80,30));
        b.addActionListener(new ActionListener() {
            
            public void actionPerformed(ActionEvent e) {
                int initMoney,year,each;
                float rate;
                initMoney=Integer.valueOf(tf1.getText());//获取起始资金
                rate=(Integer.valueOf(tf2.getText()));//获取每年收益
                year=Integer.valueOf(tf3.getText());//获取复利年数
                each=Integer.valueOf(tf4.getText());//每年追加资金
                
                int F1=(year-1)*each+initMoney;//本金和
                int F3=(int) (each* fuli(  (1+rate/100),(year-1)) + initMoney*p( (1+rate/100) ,year));//本息和
                int F2=F3-F1;//利息和
                
                tf5.setText(clauses(F1));
                tf6.setText(clauses(F2));
                tf7.setText(clauses(F3));
                
            }
        });
        
        p1.add(l1);p1.add(l2);p1.add(l3);p1.add(l4);
        p2.add(tf1);p2.add(tf2);p2.add(tf3);p2.add(tf4);
        p3.add(l5);p3.add(l6);p3.add(l7);p3.add(l8);
        p4.add(b);
        
        p5.add(l9);p5.add(l10);p5.add(l11);
        p6.add(tf5);p6.add(tf6);p6.add(tf7);
        p7.add(l12);p7.add(l13);p7.add(l14);
        
        f.add(p1);f.add(p2);f.add(p3);
        f.add(p4);
        f.add(p5);f.add(p6);f.add(p7);
        
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

    public static float p(float base,int power) {
        if(1==power)
            return base;
        if(0==power)
            return 1;
        float result = base;
        for(int i=0;i0;i--) {
            result +=p(rate,i);
        }
        return result;
    }

    protected static String clauses(int f1) {
        return String.format("%,d", f1);
    }
}

 

7.6 练习-进度条.

设计一个线程，每隔100毫秒，就把进度条的进度+1。

从0%一直加到100%

刚开始加的比较快，以每隔100毫秒的速度增加，随着进度的增加，越加越慢，让处女座的使用者，干着急

变得多慢，根据你们和处女座同学，朋友的相处体验，自己把控。

 

1、进度条组件 

JProgressBar pb=new JProgressBar();

 pb.setValue(i);

代码：

package gui;

import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JProgressBar;

public class TestGUI {

    public static void main(String[] args) {
        JFrame f=new JFrame("LOL");
        f.setSize(400,300);
        f.setLocation(500,500);
        f.setLayout(new FlowLayout(FlowLayout.CENTER,100,20));
        
        JProgressBar pb=new JProgressBar();
        pb.setMaximum(100);
        Thread t=new Thread() {
            public void run() {
                try {
                   
                  for (int i = 0; i <=100; i++) {
                        if(i<40) {
                             
                            pb.setValue(i);
                            Thread.sleep(10);
                        }
                        if(i<60&&i>40) {
                            pb.setValue(i);
                            Thread.sleep(100);
                        }
                        if(i<80&&i>60) {
                            pb.setValue(i);
                            Thread.sleep(200);
                        }
                        if(i<100&&i>80) {
                            pb.setValue(i);
                            Thread.sleep(400);
                        }
                        if(i==100) {
                             pb.setValue(0);
                             i = 0;
                            JOptionPane.showMessageDialog(f, "下载失败！点击重试！");
                        }
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
        JButton b=new JButton("开始下载");
        b.addActionListener(e-> t.start());
        pb.setStringPainted(true);
       
        f.add(pb);
        f.add(b);
        
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

}

 

7.7 练习-显示文件夹复制进度条.

改进练习-复制文件夹提供进度条，把文件复制的进度显示出来。

 

package gui;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JTextField;

public class TestGUI {
    
    static long allFileSize = 0; // 所有需要复制的文件大小
    static long currentFileSizeCopied = 0;// 已复制的文件总大小

    public static void main(String[] args) {
        JFrame f=new  JFrame("复制文件");
        f.setSize(400,200);
        f.setLocation(500,500);
        f.setLayout(null);
        
        JPanel p1=new JPanel();
        p1.setBounds(0,0,400,40);
        p1.setLayout(new FlowLayout(FlowLayout.CENTER,10,10));
        JLabel l1=new JLabel("源文件地址：");
        JLabel l2=new JLabel("复制到：");
        JTextField tf1=new JTextField();
        tf1.setPreferredSize(new Dimension(80,30));
        tf1.setText("C:\\迅雷下载");
        JTextField tf2=new JTextField();
        tf2.setText("C:\\Users\\LH\\Desktop\\迅雷下载");
        tf2.setPreferredSize(new Dimension(80,30));
        p1.add(l1);
        p1.add(tf1);
        p1.add(l2);
        p1.add(tf2);
        
        JButton b=new JButton("开始复制");
        
        JProgressBar pg=new JProgressBar();
        pg.setMaximum(100);
        pg.setValue(0);
        pg.setStringPainted(true);
        
        JPanel p2=new JPanel();
        p2.setBounds(0,40,400,50);
        p2.setLayout(new FlowLayout(FlowLayout.CENTER,10,10));
        JLabel l3=new JLabel("文件复制进度：");
        p2.add(b);
        p2.add(l3);
        p2.add(pg);
        f.add(p1);
        f.add(p2);
        
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
        
        calclateAllFilesize(new File(tf1.getText()));
        
        b.addActionListener(new ActionListener() {
            
            public void actionPerformed(ActionEvent e) {
                String A=tf1.getText();
                String B=tf2.getText();
                
                new Thread(() -> copyFolder(A,B)).start();
                b.setEnabled(false);
            }
            
            public void copyFolder(String srcFolder, String destFolder){
                
                File sf = new File(srcFolder);
                File df = new File(destFolder);
                
                if (!sf.exists())
                    return;

                if (!sf.isDirectory())
                    return;

                if (df.isFile())
                    return;

                if (!df.exists())
                    df.mkdirs();
                
//            创建文件引用集合
                File[] f = sf.listFiles();
//            创建文件名称集合
                String[] name = sf.list();
//            for读出
                for(int i=0;i