Question

package einstein;
import javax.swing.JApplet; 
import java.awt.*;

启动applett

public class Einstein extends JApplet 
{
//--------------------------------------------------------|
//draws a quotation from albert einstein among some shapes|
//--------------------------------------------------------|
@Override
public void paint (Graphics page)
{

下一行非法开始表达

    page.drawRect (50, 50, 40, 40,); //square
    page.drawRect (60, 80, 225, 30); //rectangle
    page.drawOval (75, 65, 20, 20); //circle
    page.drawLine (35, 60, 100, 120); //line

    page.drawString ("Out of clutter, find simplicity.", 110, 70);
    page.drawString ("-- Albert Einstein", 130, 100);

    }
}

它最初的油漆（图形页面）有问题，但显然@overide修复了

Answer 1

Ben只删除你在为page.drawRect传递的第四个值之后输入的额外逗号（50,50,40,40，）; //删除逗号：）

如果您想查看自己的小程序，最终的代码应为此：

import javax.swing.JApplet; 
import java.awt.*;

public class Einstein extends JApplet 
{
//--------------------------------------------------------|
//draws a quotation from albert einstein among some shapes|
//--------------------------------------------------------|
@Override
public void paint (Graphics page)
{   
    page.drawRect (50, 50, 40, 40); //square
    page.drawRect (60, 80, 225, 30); //rectangle
    page.drawOval (75, 65, 20, 20); //circle
    page.drawLine (35, 60, 100, 120); //line

    page.drawString ("Out of clutter, find simplicity.", 110, 70);
    page.drawString ("-- Albert Einstein", 130, 100);

    }
}

/*<APPLET CODE="Einstein.java" HEIGHT = 400 WIDTH = 400></APPLET>*/

Answer 2

 page.drawRect (50, 50, 40, 40,); // remove extra ,

使用如下

page.drawRect (50, 50, 40, 40);

这不是一个严肃的问题，下次在来之前检查你的代码两次。另外我建议您使用IDE编码，因为它将指导您解决这类问题。

我得到了非法的表达

2 个答案: