程序编译成功，运行时不能输入数字，这是什么问题啊？

[kaiyangzhr]

//count mileage and gallon
import java.awt.*; //import java.awt package
import java.applet.Applet;

public class Mileage extends Applet{
Label prompt1; //prompt user to input mileage
TextField input1; //input mileage
Label prompt2; //prompt user to input gallon
TextField input2; //input gallon
int counter;
int mileage,gallon;
double sum;
//setup the graphical interface components
//and initialize variables

public void init ( )
{
prompt1 = new Label ( "Enter mileage" );
input1 = new TextField ( 10 );
prompt2 = new Label ( "Enter gallon and press Enter" );
input2 = new TextField (10 );
add ( prompt1 ); //put prompt1 on applet
add ( input1 ); //put input1 on applet
add ( prompt2 ); //put prompt2 on applet
add ( input2 ); //put input2 on applet
sum = 0;
counter = 0;
}
//display the results
public void paint ( Graphics g )
{
g.drawString ( "Enter 10000 to end!" ,40,120);
while ( mileage != 10000 || gallon != 10000 )
{
sum += ( double ) mileage / gallon;
counter += 1;
}
sum = ( double ) sum / counter;
g.drawString ( "An mileage An gallon " + sum,40,150);
}
//process user's action on the input2 text field
public boolean action ( Event event, Object o )
{
if ( event.target == input2 ){
mileage = Integer.parseInt ( input1.getText () );
gallon = Integer.parseInt ( input2.getText () );
repaint ();
}
return true; //indicates user's action was processed
}
}

[inexplicable]

add action listener

[kaiyangzhr]

怎么加？

[believefym]

初始化，paint的时候while为死循环，cpu不能响应输入跳出循环

[CKJ172]

同意楼上的说法，我想你在while循环中是想用count作为结束循环的标记吧？

[kaiyangzhr]

是想输入10000的话则退出循环
死循环？怎么改？