[問題]想使用Button 改 Frame title 的錯誤

[lin25 (鯊魚~!)]

我在Button設了event

想用它來改Frame的title

event的內容如下:

public void actionPerformed(ActionEvent e) {
       System.out.println(e.getActionCommand());
       f.setTitle(e.getActionCommand());
}

結果就出現:

at java.awt.Button.processActionEvent(Unknown Source)
        at java.awt.Button.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)

錯誤

剛學java沒多久

實在搞不清楚錯誤原因

希望有人可以教我解決辦法

或是告訴我錯誤原因

謝謝!!!

--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 118.169.209.174
推 TonyQ:exception name沒列，列 exception stack tree沒用 -.-;;