我已经为我的按钮添加了一个图像,但是当我运行该框架时,会抛出这个异常。为什么?请帮助我。
init:
deps-jar:
compile-single:
run-single:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(ImageIcon.java:138)
at ClientGUI.IdAndPasswordFrame.initComponents(IdAndPasswordFrame.java:91)
at ClientGUI.IdAndPasswordFrame.<init>(IdAndPasswordFrame.java:22)
at ClientGUI.IdAndPasswordFrame$4.run(IdAndPasswordFrame.java:200)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
BUILD SUCCESSFUL (total time: 1 second)
第 138 行:
public ImageIcon (URL location) {
this(location, location.toExternalForm());
}
第 91 行:
jButton1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/yahoo_1.gif"))); // NOI18N
我使用这种糟糕的检查(Peter Lang 推荐),即:System.out.println(getClass().getResource("/Images/yahoo_1.gif")); 它返回null,为什么?请帮我。