程序代码：package applet;
import java.applet.*;
import java.awt.*;
public class Exam6_4 extends Applet {
/**
*
*/
private static final long serialVersionUID = 7453078616621241814L;
int x;
int y;
public void init() {
x = Integer.parseInt(getParameter("x"));
y = Integer.parseInt(getParameter("y"));
}
public void paint(Graphics g) {
g.drawString("hello world", x, y);
}
}
import java.applet.*;
import java.awt.*;
public class Exam6_4 extends Applet {
/**
*
*/
private static final long serialVersionUID = 7453078616621241814L;
int x;
int y;
public void init() {
x = Integer.parseInt(getParameter("x"));
y = Integer.parseInt(getParameter("y"));
}
public void paint(Graphics g) {
g.drawString("hello world", x, y);
}
}
错误信息如下。哪位大神来看看
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:542)
at java.lang.Integer.parseInt(Integer.java:615)
at applet.Exam6_4.init(Exam6_4.java:17)
at sun.applet.AppletPanel.run(AppletPanel.java:434)
at java.lang.Thread.run(Thread.java:745)