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作者 新手求教!帮我看看什么错误。
redarmy21cn



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积分: 0
于 2004-04-27 18:24 user profilesend a private message to usersearch all posts byselect and copy to clipboard. 
ie only, sorry for netscape users:-)add this post to my favorite list
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class FormTest extends MIDlet
{
  public Display display;
  public List list1;
  public Command okCmd;
  public Command exitCmd;
  public FormTest()
  {
    display.getDisplay(this);
    list1=new List("My First Program",List.IMPLICIT);
    okCmd=new Command("OK",Command.BACK,1);
    exitCmd=new Command("EXIT",Command.EXIT,1);
    list1.addCommand(okCmd);
    list1.addCommand(exitCmd);
  }
  public void startApp()
  {
    
    System.out.println("Start");
    display.setCurrent(list1);
  }
  public void pauseApp()
  {
  }
  public void destroyApp(boolean unconditional)
  {
  }
}
  

Project "NewOne1"
loadedProject settings
savedBuilding "NewOne1"Build completeRunning with storage root
DefaultColorPhoneStartstartApp threw an Exception
java.lang.NullPointerExceptionjava.lang.NullPointerException  
at FormTest.startApp(+16)  
at javax.microedition.midlet.MIDletProxy.startApp(+7)  
at com.sun.midp.midlet.Scheduler.schedule(+266)  
at com.sun.midp.main.Main.runLocalClass(+28)  
at com.sun.midp.main.Main.main(+116)
其中List换成Form,Canvas,都会出现同样的问题,请各位高手帮帮我!!



作者 Re:新手求教!帮我看看什么错误。 [Re:redarmy21cn]
OJava



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积分: 0
于 2004-05-09 13:19 user profilesend a private message to usersearch all posts byselect and copy to clipboard. 
ie only, sorry for netscape users:-)add this post to my favorite list
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class FormTest extends MIDlet
{
public Display display;
public List list1;
public Command okCmd;
public Command exitCmd;
public FormTest()
{
display = Display.getDisplay(this);
^^^^^^^^^^^^^^^^^^^^
list1=new List("My First Program",List.IMPLICIT);
okCmd=new Command("OK",Command.BACK,1);
exitCmd=new Command("EXIT",Command.EXIT,1);
list1.addCommand(okCmd);
list1.addCommand(exitCmd);
}
public void startApp()
{

System.out.println("Start");
display.setCurrent(list1);
}
public void pauseApp()
{
}
public void destroyApp(boolean unconditional)
{
}
}




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