我用的是Eclipse。
包含了
import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;进行class DrawPanel extends JPanel
{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2= (Graphics2D)g; //提示:Graphics 不能强制类型转换为 Graphics2D
double X=100,Y=100,WIDTH=200,HEIGHT=150;
Rectangle2D rect=new Rectangle2D.Double(X,Y,WIDTH,HEIGHT);
}
}怎么回事?
包含了
import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;进行class DrawPanel extends JPanel
{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2= (Graphics2D)g; //提示:Graphics 不能强制类型转换为 Graphics2D
double X=100,Y=100,WIDTH=200,HEIGHT=150;
Rectangle2D rect=new Rectangle2D.Double(X,Y,WIDTH,HEIGHT);
}
}怎么回事?
解决方案 »
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