请问JAVA按钮监听功能如何能实现以下功能？

Question

java监听

Answer 1

一个线程中
while(flag){
//output
}
点击按钮后设置flag=false;

Answer 2

public boolean l= true;
int i = 1;this.addkeyListener(){
new KeyAdapter(){
pulic void keyPressed(KeyEvent e){
if(e.getKeyCode()==VK_F1){
l= true;
}
 else if(e.getKeyCode()==VK_F2){
l= false;
}
}
}
}
while(l){

System.out.println(i);
i++;
}

Answer 3

结束循环的按钮下面代码：
System.exit(-1);
退出系统不就OK了？

Answer 4

二楼的朋友，能帮忙看看应该插在哪里吗？谢谢！startfca.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                try
                {
                    NetworkInterface[] devices=JpcapCaptor.getDeviceList();
                    JpcapCaptor pcatch=JpcapCaptor.openDevice(devices[1],65535,true,20);
                    pcatch.setFilter("ip",true);
                    Packet pfca;
                    IPPacket ipfca;
                    String typefca;
                    for(int i=0;i<devices.length;i++)
                    {
                        System.out.println(i+": "+devices[i].name+"("+devices[i].description+")");
                        System.out.println("Datalink: "+devices[i].datalink_name+"("+devices[i].datalink_description+")");
                    }
                    while(true)
                    {
                        pfca=pcatch.getPacket();
                        if(pfca!=null)
                        {
                             ipfca=(IPPacket)pfca;
                             if(ipfca.protocol==6) typefca="TCP";
                             else if(ipfca.protocol==17) typefca="UDP";
                             else if(ipfca.protocol==1) typefca="ICMP";
                             else if(ipfca.protocol==2) typefca="IGMP";
                             else if(ipfca.protocol==8) typefca="EGP";
                             else if(ipfca.protocol==9) typefca="IGP";
                             else if(ipfca.protocol==41) typefca="IPv6";
                             else typefca="OSPF";
                             pacnum++;
                             model.addRow(new String[]{""+pacnum,"IPv"+ipfca.version,""+ipfca.src_ip,""+ipfca.dst_ip,typefca,""+ipfca.len});
                        }
                        if(pacnum%100==0&&pacnum!=0) break;
                    }
                    pcatch.close();
                }
                catch(IOException ex)
                {
                    System.err.println(ex);
                }
            }
        });

Answer 5

监听处理事件中，启动线程，执行死循环。不过循环中根据一个boolean变量如果它是true就退出死循环。而在主程序中如果按下那个按钮就让这个boolean变量变为true.