Java 来自另一个JFrame的JTable值
我有Java 来自另一个JFrame的JTable值,java,swing,jtable,access-modifiers,Java,Swing,Jtable,Access Modifiers,我有JTable,我想设置另一帧中特定单元格的值。当我尝试这样做时,我得到空指针异常。我更改了修饰符并删除了异常,但仍然无法设置值 请大家帮忙 public ChequeVoucher(int id,int row){ try { String str = get_bank_name(id); System.out.println(str); table.getModel().setValueAt(str,row
JTable
,我想设置另一帧中特定单元格的值。当我尝试这样做时,我得到空指针异常。我更改了修饰符并删除了异常,但仍然无法设置值
请大家帮忙
public ChequeVoucher(int id,int row){
try {
String str = get_bank_name(id);
System.out.println(str);
table.getModel().setValueAt(str,row,5);
table.getModel().setValueAt(id,row,4);
} catch (SQLException f) {
}
setBank(id,row);
}
public void setBank(int id,int row){
try {
String str = get_bank_name(id);
table.getModel().setValueAt(str,row,5);
} catch (SQLException f) {
}
}
支票凭证是我的构造函数,这段代码在这之前是好的
table.getModel().setValueAt(str,row,5);
而JFrame
我从is中得到值
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
String str_id = (String)GetID(row,0);
int id = Integer.parseInt(str_id);
ChequeVoucher CV = new ChequeVoucher(id,row);
setVisible(false);
}
});
访问修饰符不是静态的,因此我得到以下错误堆栈
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at client.ChequeVoucher.(ChequeVoucher.java:215)
at client.popupBanks$3.mouseClicked(popupBanks.java:130)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
at java.awt.Component.processMouseEvent(Component.java:6292)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6054)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4652)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4482)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4482)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
at java.awt.EventQueue.access$000(EventQueue.java:85)
at java.awt.EventQueue$1.run(EventQueue.java:603)
at java.awt.EventQueue$1.run(EventQueue.java:601)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:617)
at java.awt.EventQueue$2.run(EventQueue.java:615)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
抱歉,前面的帖子不清楚您调用的chequeconcert方法肯定是一个构造函数,此时,您的表是空的,除非您用其他内容指定它的值。您可以在构造函数中添加表,这将解决问题。
最好的解决方案是使用JTable作为构造函数参数创建一张支票凭证,并使用方法完成所有其他操作。看这里,回答是@Hovercraft Full-Of-Eels,对我来说,这将是一个类似的问题me@mKorbel谢谢,但这不是我想要的,因为我认为我的主要问题是jTable,然后将MouseListener更改为Please don't swallow exceptions(请不要吞咽异常)。然后,您没有显示的代码中出现了错误-您的设置错误。后退一步,了解对象、类和访问器范围。。
case KeyEvent.VK_F5:
switch(col){
case 4:
//show the banks
popupBanks pB = new popupBanks(row);
pB.setVisible(true);
break;
}