java - 在 Swing 线程之外的其他线程中初始化 Swing GUI 组件是否正确，只要它们不被附加？

Question

为了加快应用程序启动速度，我将一些 GUI 生成代码移至工作线程。该线程创建所有 GUI 实例，然后使用 SwingUtilities.invokeLater 将它们附加到已经运行的应用程序 GUI。

我扩展了 ArrayList 以创建一个帮助程序类，该类会记住应该将哪些内容附加到哪些内容。

我这样使用它:

// This code runs in some other thread, not Swing thread
GUIAppendList list = new GUIAppendList();
JToggleButton button = new JToggleButton();
// The first variable represents already appended and rendered
// GUI element - for example menu
list.add(menuBarGlobalVariable, button);
// This will create all elements in Swing GUI thread
list.create();

GUIAppendList 创建如下项目:

  synchronized public void create() {
    if(done)
      return;
    done = true;
    SwingUtilities.invokeLater(new Runner(this));
  }

  protected static class Runner implements Runnable {
    public final GUIAppendList list;
    public Runner(GUIAppendList list) {
      this.list = list;
    }
    @Override
    public void run() {
      for(AddChild c : list) {
        c.join();
      }
      if(!list.after.isEmpty()) {
        for(Runnable c : list.after) {
          c.run();
        }
      }
    }
  }

但自从我这样做后，我的应用程序开始随机(到目前为止并不总是并且从未处于 Debug模式)卡住。创建 GUI 元素是否有可能导致即使它们没有连接到主窗口？

这是完整的附加程序类:

import java.awt.Component;
import java.awt.Container;
import java.util.ArrayList;
import javax.swing.SwingUtilities;

/**
 * This class allows you to prepare a list of swing elements that should be
 * joined together. After you create the list, use .create() method which will
 * then add all the items within the Swing main thread. This is done using
 * invokeLater.
 * @author Jakub
 */
public class GUIAppendList extends ArrayList<GUIAppendList.AddChild> {
  /**
   * Represents two nodes, container and component.
   */
  public static class AddChild {
    public AddChild(Container parent, Component child) {
      this.parent = parent;
      this.child = child;
    }
    final Container parent;
    final Component child;

    // Joins the two elements together
    // THIS MUST BE CALLED IN THE SWING THREAD!!!
    void join() {
      parent.add(child); 
    };
  }

  // Prevents from calling the add in the list multiple times
  private boolean done = false;
  // List of other actions to be executed after creating the GUI
  protected ArrayList<Runnable> after = new ArrayList();

  synchronized public void add(Container parent, Component child) {
    this.add(new AddChild(parent, child));
  }
  synchronized public void after(Runnable action) {
    after.add(action);
  }
  /**
   * Will ask Swing to run our runnable object which will append all the items.
   */
  synchronized public void create() {
    if(done)
      return;
    done = true;
    SwingUtilities.invokeLater(new Runner(this));
  }

  protected static class Runner implements Runnable {
    public final GUIAppendList list;
    public Runner(GUIAppendList list) {
      this.list = list;
    }
    @Override
    public void run() {
      // Append all nodes to each other
      for(AddChild c : list) {
        c.join();
      }
      // Run after actions
      if(!list.after.isEmpty()) {
        for(Runnable c : list.after) {
          c.run();
        }
      }
    }
  }
}

Answer 1

不，这是不正确的，所有 Swing 组件都必须在 EDT 上创建/修改/添加/删除。