“父"的调用方法Java中的组件 [英] Calling methods of "parent" component in Java

问题描述

我认为最好在示例程序代码中显示以下情况.我有一个扩展 JPanel 的 Java 类.在这个类中有两个对象，它们是另外两个 JPanels.JPanel 对象之一是 JTable 对象.我向这个 JTable 添加了一个监听器来检测双击.当它检测到双击时，我想在顶级类中触发一个方法.如何在 Java 中引用此方法?

I have the following situation I think would be best to show in sample program code. I have a Java class that extends JPanel. In this class are two objects which are two more JPanels. In one of the JPanel objects is a JTable object. I added a listener to this JTable that detects a double click. When it detects a double click, I want to fire a method in the top class. How do I reference this method in Java?

public class TopPanel extends JPanel {

  JPanel OnePanel;
  JPanel TwoPanel;

  public void MethodToFire;

}

public class OnePanel extends JPanel {

  JTable TheTable;

}

public class TheTable extends JTable {

  public TheTable {
    this.addMouseListener(new MouseAdapter(){
      public void mouseClicked(MouseEvent e){
          if (e.getClickCount() == 2){ SYNTAX CALLING THE METHOD IN TopPanel  }
      }
    } );
  }
}

推荐答案

解决这个问题的一种方法是使用组合而不是继承.您可以将 JPanel 传递到 JTable 的子类中.

One way to solve this is to use composition instead of inheritance. You could pass the JPanel into your subclass of the JTable.

public class TopPanel extends JPanel 
{
  private TheTable table;

  public TopPanel()
  {
    table = new TheTable(this);
  }

  public void methodToFire() { }
}

public class TheTable extends JTable 
{
  private TopPanel panel;

  public TheTable(TopPanel panel)
  {
    this.panel = panel;

    this.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        doThing();
      }
    } );
  }

  private void doThing()
  {
    this.panel.methodToFire(); 
  }
}

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