怎么用java画矩形?并且可以在后续添加直线?还有Graphics.drawPolyline(int[] a,int[] b,int n);的用法。谢谢了
怎么用java画矩形?并且可以在后续添加直线?
下面的这个函数用了Graphics.drawPolyline(int[] a,int[] b,int n);方法,
用main()调用时为什么会出错呢?
import java.applet.Applet;
import java.awt.Graphics;
/**
*
* @author Administrator
* 画矩形
*/
public class Grid extends Applet{
Graphics g;
public Grid(){
int[] xPoints={0,700,700,0,0};
int[] yPoints={0,0,700,700,0};
int nPoints=5;
g.drawPolyline(xPoints, yPoints, nPoints);
}
}