单击获取JButton的名称 [英] Getting the name of a JButton on click

问题描述

  @Override
  public void actionPerformed(ActionEvent e) {
      if (e.getSource() == thirdBtn) {
          //System.out.println("Third Button Click");
          System.out.println(e.getSource()+" Click");
      }
  }

在上面的代码中，我想知道是否要这样做:

In the code above, I was wondering if instead of doing this:

//System.out.println("Third Button Click");

如果我可以做这样的事情:

if I could do something like this:

System.out.println(e.getSource()+" Click");

但是代码输出:

BlackJack.OverBoard$BlackJackButton[,440,395,100x25,alignmentX=0.0,alignmentY=0.5,
    border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@7a3d8738,
    flags=16777504,maximumSize=,minimumSize=,preferredSize=,
    defaultIcon=,disabledIcon=,disabledSelectedIcon=,
    margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],
    paintBorder=false,paintFocus=true,
    pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,
    text=Change,defaultCapable=true] Click

我不想要这个，我想知道如何获取JButton名称并在点击时输出它.

I don't want this, I want to know how to get the JButton name and output it on click.

有些人感到困惑.当我说名称"(也许是错误的词)时，我的意思是说您初始化了JButton

Some people are confused. When I say "name" (maybe that's the wrong word for it), I meant say you initialize a JButton

JButton btnExample = new JButton();

我想要它，以便当您单击按钮时，它会在控制台中输出btnExample.

I want it so that when you click the button, it outputs btnExample in the console.

推荐答案

如果知道只有JComponents将是e.getSource()的返回值，则可以强制转换为JComponent.提供更大的灵活性.如果仅使用JButtons，则可以安全地强制转换为JButton.

You can cast to a JComponent if you know that only JComponents will be the return value of e.getSource() I'm using JComponent as the cast since it gives more flexibility. If you're only using JButtons, you can safely cast to a JButton instead.

  @Override
            public void actionPerformed(ActionEvent e) {
                if (e.getSource() == thirdBtn) {
                    //System.out.println("Third Button Click");
                    System.out.println(((JComponent) e.getSource()).getName()+" Click");
                }
            }

根据您的实际需求，随意将getName()替换为getText().

Feel free to replace getName() with getText(), depending on what exactly you need.

此外，==运算符仅应用于比较对象引用，因此请考虑从一开始就强制转换为JComponent并在名称或文本上使用.equals().

Also, the == operator should only be used to compare Object references, so consider casting to a JComponent from the beginning and using .equals() on the names or text.

修改 您无法输出变量的名称，但是可以设置JComponent的名称/文本. 例如

Edit You can't output the name of the variable, but you can set the name/text of the JComponent. Eg

JButton btnExample = new JButton();
btnExample.setName("btnExample");

或者如果您希望"btnExample"实际上显示在按钮上:

Or if you want "btnExample" to actually be displayed on the button:

JButton btnExample = new JButton();
btnExample.setText("btnExample");

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