awt如何在actionListener（java）中共享变量

Question

我正在尝试创建一个首选项菜单，并尝试共享action listener中的一个变量。提前谢谢

public void actionPerformed(ActionEvent e) {
    if(e.getSource()==buttonp1) {
        player_c=c1.getText();
        if(player_c.equalsIgnoreCase("blue")) {
            p1_color="blue";
    //i want to share a String with another class.
        }
        if(player_c.equalsIgnoreCase("red")) {
            p1_color="red";
        }
        if(player_c.equalsIgnoreCase("green")) {
            p1_color="green";
        }
    }
} 

Answer 1

将变量移动到另一个类，并将实例传递给侦听器（可能是通过词法范围）

class Player {
    private String color;
    // ...
    public void setColor(String color) {
        this.color = Objects.requireNonNull(color);
    }
}

// ...

   Player p1 = ...;
   // (Watch the repetition.)
   blue.addActionListener(event -> {
       p1.setColor("blue");
   });
   red.addActionListener(event -> {
       p1.setColor("red");
   });
   green.addActionListener(event -> {
       p1.setColor("green");
   });
   // ...