您所在位置：主题：帮忙看下这个10行的程序,新手
忧愁虾米
[专家分：600] 发布于 2007-09-27 21:52:00
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import java.io.*;
public class test extends MIDlet //implements CommandListener
{
Display display;
public test()
{
display=Display.getDisplay(this);
}
public void startApp()
{
Alert alert=new Alert("this is show image:");
alert.setTimeout(Alert.FOREVER);//不Alt是er
alert.setString("aa");
display.setCurrent(alert);
}
public void pauseApp()
{}
public void destroyApp(boolean unconditional)
{}
}
编译通过,运行时说nullPointerException 错误
import javax.microedition.midlet.*;
import java.io.*;
public class test extends MIDlet //implements CommandListener
{
Display display;
public test()
{
display=Display.getDisplay(this);
}
public void startApp()
{
Alert alert=new Alert("this is show image:");
alert.setTimeout(Alert.FOREVER);//不Alt是er
alert.setString("aa");
display.setCurrent(alert);
}
public void pauseApp()
{}
public void destroyApp(boolean unconditional)
{}
}
编译通过,运行时说nullPointerException 错误
