jar 无法在命令行上运行

Question

我确实通过谷歌和各种论坛进行了搜索（也是这个）。

我创建了一个应用程序，一个 java 基准测试，并想要创建一个可运行的 jar 文件，以便在其他计算机上使用该程序。不幸的是，jar 不起作用，一切都通过制作 jar 文件的代码完美完成，程序在命令行上运行。我尝试了在这个论坛上找到的技巧来修复我的 jar 创建，但效果不佳。

奇怪的是，当我编译 JavaBenchmark.java 文件时，我不仅得到一个文件（JavaBenchmark.class），而且还得到 JavaBenchmark$1.class :O （有人知道为什么吗？）

所以我请你检查我的代码是否有可能有些问题，我必须说它是一个 GUI 应用程序。

import java.io.*;
import java.util.Date;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JavaBenchmark  implements ActionListener
{
    private Frame mainWindow;
    private Button exit;
    private String dateAndTime;
    private TextArea values;
    private String stringMaxMemory;
    private String stringFreeMemory;
    private String stringTotalFreeMemory;
    private String stringAllocatedMemory;

    public JavaBenchmark(String s)
    {
        Date myDate = new Date();
        dateAndTime = String.format("%tA, %<tF", myDate);

        File[] roots = File.listRoots();

        mainWindow = new Frame(s);
        mainWindow.setSize(640,480);
        mainWindow.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent we){System.exit(0);}});

        String version = System.getProperty("java.version");
        String jvmversion = System.getProperty("java.jvm.version");
        String checkedJvmVersion;
        if (jvmversion == null)
        {
            checkedJvmVersion = "Java Virtual Machine version: N/A";
        }
        else
        {
            checkedJvmVersion = "Java Virtual Machine version: " + jvmversion;
        }
        String jvmname = System.getProperty("java.vm.name");
        String osname = System.getProperty("os.name");
        String osarchitecture = System.getProperty("os.arch");
        String osversion = System.getProperty("os.version");
        String processor = System.getenv("PROCESSOR_IDENTIFIER");
        int processorCores = Runtime.getRuntime().availableProcessors();

        Runtime runtime = Runtime.getRuntime();
        double freeMemory = runtime.freeMemory();
        double allocatedMemory = runtime.totalMemory();
        double maxMemory = runtime.maxMemory();
        double totalFreeMemory = (freeMemory + (maxMemory - allocatedMemory));
        stringFreeMemory = String.format("%5.2f", (freeMemory)/1024/1024);
        stringAllocatedMemory = String.format("%5.2f", (allocatedMemory)/1024/1024);
        stringMaxMemory = String.format("%5.2f", (maxMemory)/1024/1024);
        stringTotalFreeMemory = String.format("%5.2f", (totalFreeMemory)/1024/1024);

        exit = new Button("Exit"); exit.addActionListener(this);
        values = new TextArea(30, 120);

    Panel exitButton = new Panel();

    exitButton.add(exit);

    mainWindow.add(values, "North");        
    mainWindow.add(exitButton);

    values.append("Your Java benchmark, as on: " + dateAndTime + "\n\n");
    values.append("Java version: " + version + "\n");
    values.append("Java Virtual machine version: " + checkedJvmVersion + "\n");
    values.append("Java Virtual Machine name: " + jvmname + "\n");
    values.append("\n");
    values.append("Operating System: " + osname + "\n" + osarchitecture + " os version: " + osversion + "\n");
    values.append("\n");
    values.append("Processor: " + processor + " (number of cores: " + processorCores + ")\n");
    values.append("\n");
    values.append("Memory info: \n");
    values.append("Maximum RAM memory for JVM:     " + stringMaxMemory + " Mb\n");
    values.append("Allocated RAM memory for JVM:     " + stringAllocatedMemory + " Mb\n");
    values.append("Free RAM memory for JVM:     " + stringFreeMemory + " Mb\n");
    values.append("Total free RAM memory for JVM:     " + stringTotalFreeMemory + " Mb\n\n\n");
    values.append("HardDrive, and VirtualDrive details:\n");
    for (File root : roots) {
          if (root.getTotalSpace() == 0)
          {
              continue;
          }
          else 
          {
              values.append("Disk: " + root.getAbsolutePath() + " space allocation:\n");
              values.append("Total space :"); 
              values.append(String.format("%5.2f", Double.valueOf(root.getTotalSpace())/1024/1024/1024));
              values.append(" Gb\n");
              values.append("Free space : ");
              values.append(String.format("%5.2f", Double.valueOf(root.getFreeSpace())/1024/1024/1024));
              values.append(" Gb\n");
              values.append("Occupied disk space : ");
              values.append(String.format("%5.2f", Double.valueOf(root.getTotalSpace() - root.getFreeSpace())/1024/1024/1024));
              values.append(" Gb\n\n");

          }
        }

    mainWindow.pack();              //Creating the window
    mainWindow.setLocationRelativeTo(null);         //true: position at (0,0)     false: position at center
    mainWindow.setResizable(false);         //Intuitively known commands
    mainWindow.setVisible(true);        //Intuitively known commands
}

public static void main(String[] args) 
{
    new JavaBenchmark("Display");
}

public void actionPerformed(ActionEvent e) {
    if(e.getSource()==exit) 
    {
        System.exit(0);
    }
}
}

Answer 1

JavaBenchmark$1.class 是您在添加窗口侦听器时为 WindowAdapter 创建的匿名类。

至于 Jar 不起作用，您必须描述您正在做什么来创建 Jar 以确定哪里出了问题。很可能您只是发出了错误的命令。

Answer 2

JavaBenchmark$1.class 是匿名类，定义如下：

new WindowAdapter(){public void windowClosing(WindowEvent we){System.exit(0);}}