好的我收到此错误awt eventqueue 0 nullpointerexception error
。当我尝试删除JPanel
时。
令我感到困惑的是,当我删除另一个JPanel
时,它的效果非常好,但这个却没有。下面的第一个代码显示JPanel
,当我点击JButton
时,它不会删除JPanel
。
public class buttontime implements ActionListener { //creating actionlistener for clicking on timebutton to bring up a combobox
public void actionPerformed(ActionEvent clickTime) {
Price priceObject = new Price();
priceObject.getPricepanel();
remove(priceObject.getPricepanel());
priceObject.getPricepanel().revalidate();
add(timeObject.getTimePanel(), BorderLayout.EAST);
timeObject.getTimePanel().revalidate();
}
}
//This one gives me 0 errors.
public class buttonprice implements ActionListener { //creating actionlistener for clicking on timebutton to bring up a combobox
public void actionPerformed(ActionEvent ClickPrice) {
Price priceObject = new Price();
priceObject.SelectPrice();
remove(timeObject.getTimePanel());
timeObject.getTimePanel().revalidate();
add(priceObject.getPricepanel(), BorderLayout.EAST);
priceObject.getPricepanel().revalidate();
}
}
答案 0 :(得分:1)
remove(priceObject.getPricepanel());
如果您在删除此面板时收到NullPointerException
,则priceObject.getPricepanel()
必须返回null
。