Java核心技术卷1 开发基础第2章 Java程序设计环境 2.2 使用命令行工具

淩亂°似流年 2024-03-16 12:52 45阅读 0赞

#### Java核心技术卷1 开发基础 ####

#### 文章目录 ####

*   *   *  Java核心技术卷1 开发基础
         *   *  第2章 Java程序设计环境
             *   *  2.2 使用命令行工具

![在这里插入图片描述][30d32083ce844adc91d317d6623672e4.png_pic_center]

##### 第2章 Java程序设计环境 #####

###### 2.2 使用命令行工具 ######

书的配套源码下载地址：[https://horstmann.com/corejava/][https_horstmann.com_corejava]

![在这里插入图片描述][a0a8a3aedc944627b0d2b4a9b656659d.png_pic_center]

直接解压出来，笔者这里直接用IDEA 导入打开

![在这里插入图片描述][24a87678fe1143619bb666b905241a56.png_pic_center]

> 笔者使用的IDEA 版本2023.1.2
> 
> ![在这里插入图片描述][2c4998d3d0af473db0146d7ae3be1e3c.png_pic_center]
> 
> 教育认证

![在这里插入图片描述][ba6ec9480b41414bb9e0a3f2d148df90.png_pic_center]

直接打开

![在这里插入图片描述][6288113725a9492daabed31e16feb535.png_pic_center]

设置一下项目用到的JDK 版本为我们才安装的17

![在这里插入图片描述][66ba2b7aca1943a3bbe925e61213c4ad.png_pic_center]

`D:\DingJiaxiong\IdeaProjects\corejava\v1ch02\Welcome>`

运行命令：

javac Welcome.java
    
    java Welcome

![在这里插入图片描述][955d213b371741fa9c5da3ead404556d.png_pic_center]

程序代码：

/**
     * This program displays a greeting for the reader.
     * @version 1.30 2014-02-27
     * @author Cay Horstmann
     */
    public class Welcome
    {
        
       public static void main(String[] args)
       {
        
          String greeting = "Welcome to Core Java!";
          System.out.println(greeting);
          for (int i = 0; i < greeting.length(); i++)
             System.out.print("=");
          System.out.println();
       }
    }

![在这里插入图片描述][761498ff770a49a4aea3e255bda94a34.png_pic_center]

再来试一个图形化应用

import java.awt.*;
    import java.io.*;
    import javax.swing.*;
    
    /**
     * A program for viewing images.
     *
     * @author Cay Horstmann
     * @version 1.31 2018-04-10
     */
    public class ImageViewer {
        
        public static void main(String[] args) {
        
            EventQueue.invokeLater(() ->
            {
        
                var frame = new ImageViewerFrame();
                frame.setTitle("ImageViewer");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            });
        }
    }
    
    /**
     * A frame with a label to show an image.
     */
    class ImageViewerFrame extends JFrame {
        
        private static final int DEFAULT_WIDTH = 300;
        private static final int DEFAULT_HEIGHT = 400;
    
        public ImageViewerFrame() {
        
            setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
    
            // use a label to display the images
            var label = new JLabel();
            add(label);
    
            // set up the file chooser
            var chooser = new JFileChooser();
            chooser.setCurrentDirectory(new File("."));
    
            // set up the menu bar
            var menuBar = new JMenuBar();
            setJMenuBar(menuBar);
    
            var menu = new JMenu("File");
            menuBar.add(menu);
    
            var openItem = new JMenuItem("Open");
            menu.add(openItem);
            openItem.addActionListener(event ->
            {
        
                // show file chooser dialog
                int result = chooser.showOpenDialog(null);
    
                // if file selected, set it as icon of the label
                if (result == JFileChooser.APPROVE_OPTION) {
        
                    String name = chooser.getSelectedFile().getPath();
                    label.setIcon(new ImageIcon(name));
                }
            });
    
            var exitItem = new JMenuItem("Exit");
            menu.add(exitItem);
            exitItem.addActionListener(event -> System.exit(0));
        }
    }

![在这里插入图片描述][bf5ee2a7088c40198035ee3c37b793ee.png_pic_center]

我就直接运行了，不用命令行了

![在这里插入图片描述][a49fad3c50ee4013bdfe2fb793adbe95.png_pic_center]

![在这里插入图片描述][7f397929531b48bcb3632af4d731fe7d.png_pic_center]

打开一个图像

![在这里插入图片描述][718f2ccd728a41ec83e71d078b861921.png_pic_center]

![在这里插入图片描述][0fbffa5721e14db0bb4ddbf9d202df67.png_pic_center]

还行。

![在这里插入图片描述][7526841173434ff39270093732722a4f.png_pic_center]

直接退出

![在这里插入图片描述][17d43daf9c794ad38b999ee94b3a5e04.png_pic_center]

这是一个带图形用户界面的桌面应用。

> 笔者还是准备自己建一个工程

![在这里插入图片描述][1d79b82242d04c8cb4df7869456c1634.png_pic_center]

![在这里插入图片描述][a0d68d931a904377bd746c0b1278c8f3.png_pic_center]

![在这里插入图片描述][5c486d0d20d043a281780b5cd31b6653.png_pic_center]

之后就一章一个模块。

![在这里插入图片描述][9862efa55c3545e1b4666be89f7bcc43.png_pic_center]

![在这里插入图片描述][faf954c88b044218bfe5cd95e20f26d5.png_pic_center]

[30d32083ce844adc91d317d6623672e4.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/70be0f3a3a534e8f81620dc77a64cecf.png
[https_horstmann.com_corejava]: https://horstmann.com/corejava/
[a0a8a3aedc944627b0d2b4a9b656659d.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/c06a590ffb804bacbaf4b120f63a1fb9.png
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[2c4998d3d0af473db0146d7ae3be1e3c.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/e9e4f35e0f4748a8b8d20fa0a9e6b916.png
[ba6ec9480b41414bb9e0a3f2d148df90.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/ceda14e367ee4d0aa2b818691ec91838.png
[6288113725a9492daabed31e16feb535.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/1155dca886eb49a492c926d39888ba22.png
[66ba2b7aca1943a3bbe925e61213c4ad.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/5c07e02b80284f7c830ae2acf9e1da64.png
[955d213b371741fa9c5da3ead404556d.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/5b400a6b5a734d5ca36b82b389281cf1.png
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[bf5ee2a7088c40198035ee3c37b793ee.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/1b3d9f6d64a54fe49a7777ea51d46d6c.png
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[718f2ccd728a41ec83e71d078b861921.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/fc47743f3672473fbe89c49dacd1c389.png
[0fbffa5721e14db0bb4ddbf9d202df67.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/08e2147449a142729c5aca023d4fc326.png
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[17d43daf9c794ad38b999ee94b3a5e04.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/69d96664de684dc7b55f6d4fad87c621.png
[1d79b82242d04c8cb4df7869456c1634.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/6865518e08cb4e24ae150f31ceac3a60.png
[a0d68d931a904377bd746c0b1278c8f3.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/9dabe5f93a804b01b010ed454a966e47.png
[5c486d0d20d043a281780b5cd31b6653.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/070af4964d6f4a8099c47d4d32ce1ff0.png
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