JAVA GUI代码没有';I don’我没有按预期运行
我从书上输入了这个代码JAVA GUI代码没有';I don’我没有按预期运行,java,user-interface,Java,User Interface,我从书上输入了这个代码 public class SimpleGui3C { JFrame frame; public static void main (String[] args) { SimpleGui3C gui = new SimpleGui3C(); gui.go(); } public void go() { frame = new JFrame("My own code"); frame.setDefaultCloseOper
public class SimpleGui3C {
JFrame frame;
public static void main (String[] args) {
SimpleGui3C gui = new SimpleGui3C();
gui.go();
}
public void go() {
frame = new JFrame("My own code");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MyDrawPanel drawPanel = new MyDrawPanel();
frame.getContentPane().add(BorderLayout.CENTER, drawPanel);
frame.setSize(420,300);
frame.setVisible(true);
}}
class MyDrawPanel extends JPanel {
public void painComponent(Graphics g) {
g.fillRect(0,0,this.getWidth(), this.getHeight());
int red = (int) (Math.random() * 255);
int green = (int) (Math.random() * 255);
int blue = (int) (Math.random() * 255);
Color randomColor = new Color(red, green, blue);
g.setColor(randomColor);
g.fillOval(70,70,100,100);
}}
结果是:
这是这本书的原始代码,我是从这本书的网站上下载的
public class SimpleGui3C {
JFrame frame;
public static void main (String[] args) {
SimpleGui3C gui = new SimpleGui3C();
gui.go();
}
public void go() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MyDrawPanel drawPanel = new MyDrawPanel();
frame.getContentPane().add(BorderLayout.CENTER, drawPanel);
frame.setSize(420,300);
frame.setVisible(true);
}}
class MyDrawPanel extends JPanel {
public void paintComponent(Graphics g) {
g.fillRect(0,0,this.getWidth(), this.getHeight());
// make random colors to fill with
int red = (int) (Math.random() * 255);
int green = (int) (Math.random() * 255);
int blue = (int) (Math.random() * 255);
Color randomColor = new Color(red, green, blue);
g.setColor(randomColor);
g.fillOval(70,70,100,100);
}}
结果如下:
我一次又一次地检查以确保它们是一样的,看起来它们是一样的。但是为什么GUI不同呢
请帮助,提前感谢。在您自己的代码中,方法名称是
painComponent
,而它应该是painComponent
提示:将@Override
添加到重写的方法中,编译器将告诉您以下错误:
@Override
public void painComponent(Graphics g) {
在您自己的代码中,方法名称应该是
painComponent
,而方法名称应该是paintComponent
提示:将@Override
添加到重写的方法中,编译器将告诉您以下错误:
@Override
public void painComponent(Graphics g) {
事实上,
@Override
使事情变得不那么痛苦。查看问题了解有关@Override
的更多信息确实,@Override
使事情变得不那么痛苦。查看问题了解有关@Override
的更多信息这是一个打字错误:painComponent这是一个打字错误:painComponent