java 执行了 JButton 操作？
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JButton Action Performed?
提问by 3eternus
I have created a Jframe/button with 10x10 grid. Each jbutton is apart of the grid. I am trying to how to affect each button pressed through JFrame/button, as I want to eventually make it into a battleships games.
我创建了一个带有 10x10 网格的 Jframe/按钮。每个 jbutton 都是网格的一部分。我正在尝试如何影响通过 JFrame/button 按下的每个按钮，因为我想最终将其制作成战舰游戏。
frame.setLayout(new GridLayout(width,length));
grid=new JButton[width][length];
for(int y=0; y<length; y++){
for(int x=0; x<width; x++){
grid[x][y]=new JButton("("+x+","+y+")");
frame.add(grid[x][y]);
}
}
For example I am trying a basic piece of code to see if i can change the color of the Jframe to red by clicking it but it doesn't seem to be working.
例如，我正在尝试一段基本的代码，看看我是否可以通过单击将 Jframe 的颜色更改为红色，但它似乎不起作用。
public void actionPerformed(ActionEvent e){
if( e.getSource() instanceof JButton) {
((JButton)e.getSource()).setBackground(Color.red);
}
}
Anyone got any ideas?
有人有任何想法吗？
回答by Dacotah
I made this work by creating the JButtons separately rather than as part of a grid, but the general idea is the same. You cannot call actionPerformed like you have it, you must have a class that implements ActionListener and then has an override for the method actionPerformed.
我通过单独创建 JButton 而不是作为网格的一部分来完成这项工作，但总体思路是相同的。你不能像你拥有的那样调用 actionPerformed，你必须有一个实现 ActionListener 的类，然后有一个方法 actionPerformed 的覆盖。
You need to add a actionlistener to each of the JButtons. In this case since you want to apply the same listener to multiple buttons you want a separate class underneath your main.
您需要为每个 JButton 添加一个动作侦听器。在这种情况下，由于您想将相同的侦听器应用于多个按钮，因此您需要在 main 下有一个单独的类。
class buttonListener implements ActionListener {
@Override
public void actionPerformed (ActionEvent e) {
((JButton)e.getSource()).setBackground(Color.red);
}
}
The reason why the button was not changing colours is because you need to add the following in order to change the colour of a JButton
按钮没有改变颜色的原因是因为您需要添加以下内容才能更改 JButton 的颜色
JButton j = new JButton("test");
j.setSize(100, 100);
j.setContentAreaFilled(true);
j.setOpaque(true);
j.addActionListener(new buttonListener());
I know this isn't the most direct answer to your question but I hope I at least helped get the colours sorted out.
我知道这不是您问题的最直接答案，但我希望我至少能帮助您理清颜色。
回答by Olavi Mustanoja
Let's say we have a button: JButton button. To invoke an action when the button is pressed, an action listener must be added to it. There are two ways of doing this (that I know of):
假设我们有一个按钮：JButton button。要在按下按钮时调用动作，必须向其添加动作侦听器。有两种方法可以做到这一点（我知道）：
I think this is more often used than the second method. It's also easier and faster to write IMO:
我认为这比第二种方法更常用。编写 IMO 也更容易、更快：
JButton button = new JButton("Click me");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("button was clicked!");
}
}
Another kind of action listener. The functionality and use is somewhat different. However to achieve a button that behaves simarly to an ActionListener, do this:
另一种动作监听器。功能和用途有些不同。但是，要实现行为类似于 的按钮ActionListener，请执行以下操作：
Action buttonAction = new AbstractAction("Click me") {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("button was clicked!");
}
}
JButton button = new JButton(action);
Note that in both examples I'm using anonymous innerclasses. In most cases, using a named inner class or even an external class is more preferable.
请注意，在两个示例中，我都使用匿名 内类。在大多数情况下，使用命名的内部类甚至外部类更可取。
Choosing between an ActionListenerand an Actiondepends a little on the situation (as always... sigh), and I'm afraid I cannot shed too much light on this matter. Google is your friend here. A fast search provided this post from SO: link
在 anActionListener和 an之间进行选择Action取决于情况（一如既往......叹息），恐怕我不能对这个问题透露太多。谷歌是你的朋友。快速搜索提供了这篇来自 SO 的帖子：链接
回答by Carlos Rojas
you can create your own action listener:
您可以创建自己的动作侦听器：
class MyActionListener implements ActionListener {
private int x;
private int y;
public MyActionListener(int x, int y) {
this.x = x;
this.y = y;
}
public void actionPerformed(ActionEvent e) {
DoSomething(x, y);
}
}
...
grid = new JButton[wid][len];
for(int y = 0; y < len; y++){
for(int x = 0; x < wid; x++){
grid[x][y]=new JButton("("+x+","+y+")");
grid[x][y].addActionListener(new MyActionListener(x, y));
frame.add(grid[x][y]);
}
}
