java 计算按下 JButton 的次数？
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Count how many times a JButton is pressed?
提问by Philip McQuitty
In the action performed code in a JAVA GUI, how would I count how many times a button is pressed, and do something different for each press of the button?
在 JAVA GUI 中执行操作的代码中，我如何计算按钮被按下的次数，并为每次按下按钮执行不同的操作？
private class Listener implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
HOW WOULD I COUNT HOW MANY TIMES THIS BUTTON HAS BEEN PRESSED?
}
Thanks!!!
谢谢！！！
回答by camickr
Create a class variable and then increment the variable in the method.
创建一个类变量，然后在方法中递增该变量。
private class Listener implements ActionListener
{
private int clicked;
public void actionPerformed (ActionEvent e)
{
clicked++
}
}
You can then create a method to access the variable.
然后，您可以创建一个方法来访问该变量。
回答by Sadiq
You can have a field in the Listener class and increment it every time the button is pressed and then have a switch to select the action to perform depending on the value of your variable.
您可以在 Listener 类中有一个字段并在每次按下按钮时增加它，然后有一个开关来根据变量的值选择要执行的操作。
private class Listener implements ActionListener
{
private int clicks;
public void actionPerformed (ActionEvent e)
{
clicks++;
switch (clicks){
case '1':
// Do operation 1
break;
case '2':
// Do operation 2
break;
}
}
}
回答by Dinesh Madhup
You have declared clicks as int, therefore, case statement needs int value not the char.
您已将 clicks 声明为 int，因此，case 语句需要 int 值而不是 char。
Corrected version:
修正版：
private class Listener implements ActionListener
{
private int clicks;
public void actionPerformed (ActionEvent e)
{
clicks++;
switch (clicks){
case 1:
// Do operation 1
break;
case 2:
// Do operation 2
break;
}
}
}
回答by Jebbillbobk
Just use e.getClickCountin your MouseEvent
只需e.getClickCount在您的 MouseEvent 中使用
