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我正在创建一个简单的 JFrame 窗口并检查 Windows 任务管理器的内存使用情况,当我尝试使用鼠标指针而不是最大按钮来调整 JFrame 的大小时,它增加了从 51,000k 到 400,000k 的大量内存并且它永远不会下降但是当我使用最大按钮时,它甚至没有增加内存。

是什么导致它增加了很多内存并且它永远不会下降?

Image bg = new ImageIcon(getClass().getResource("circle.png")).getImage();
    JFrame jf = new JFrame("MySqlConnections");
    jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jf.setSize(400,400);
    jf.setIconImage(bg);
    new ConnectMysql(jf);
    jf.setLocationRelativeTo(null);
    jf.setPreferredSize(new Dimension(xFrame, yFrame)); 
    jf.setMinimumSize(jf.getPreferredSize());
    jf.setVisible(true);


public static void main(String[] args) {
    new MainFrame();
     /* Total number of processors or cores available to the JVM */
    System.out.println("Available processors (cores): " + 
        Runtime.getRuntime().availableProcessors());

    /* Total amount of free memory available to the JVM */
    System.out.println("Free memory (bytes): " + 
        Runtime.getRuntime().freeMemory());

    /* This will return Long.MAX_VALUE if there is no preset limit */
    long maxMemory = Runtime.getRuntime().maxMemory();
    /* Maximum amount of memory the JVM will attempt to use */
    System.out.println("Maximum memory (bytes): " + 
        (maxMemory == Long.MAX_VALUE ? "no limit" : maxMemory));

    /* Total memory currently in use by the JVM */
    System.out.println("Total memory (bytes): " + 
        Runtime.getRuntime().totalMemory());

    /* Get a list of all filesystem roots on this system */
    File[] roots = File.listRoots();

    /* For each filesystem root, print some info */
    for (File root : roots) {
      System.out.println("File system root: " + root.getAbsolutePath());
      System.out.println("Total space (bytes): " + root.getTotalSpace());
      System.out.println("Free space (bytes): " + root.getFreeSpace());
      System.out.println("Usable space (bytes): " + root.getUsableSpace());
    }

}
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1 回答 1

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它可能会在您逐步调整大小时增加内存,它需要一次又一次地重新绘制整个帧。为什么它不会关闭,因为它依赖于垃圾收集器,只要有空间释放一些内存,它就不会立即运行。

于 2013-05-12T07:23:40.423 回答