java,怎么绘制不了图啊....
import java.awt.*;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.*;
public class photo extends JFrame{
JFrame frame;
Container container;
JPanel panel1;
JPanel panel2;
JButton button;
File file = null;
URL url = null;
ImageIcon imageicon;
Image image = null; //声明照片变量
//Graphics g = panel1.getGraphics();
public photo(){
frame = new JFrame();
container = frame.getContentPane();
frame.show(); //可使 他内部的组件全不可见
//container.getGraphics();
if(container.getGraphics() instanceof Graphics){ //必须先让要得到图形上下文,即得到Graphis的对象可见
System.out.println("没得到了画笔:");
}
panel1 = new JPanel();
panel2 = new JPanel();
button = new JButton("按钮");
file = new File("E:\\Media\\照片\\a.jpg");
try {
url = file.toURL();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
imageicon = new ImageIcon(url);
panel1.add(button);
panel2.setBackground(Color.red);
//p(container.getGraphics());
imageicon.paintIcon(container, container.getGraphics(), 0, 0);
frame.show();
//repaint(); //container.getGraphics()得不到画笔啊
}
public void p(Graphics g){
imageicon.paintIcon(container, g, 0, 0);
}
/*public void paint(Graphics g){
imageicon.paintIcon(container, g, 0, 0);
}*/
public static void main(String[] args){
// TODO Auto-generated method stub
photo fr = new photo();
}
}
--------------------编程问答-------------------- 不确定,感觉是不是因为少了一个焦点的原因。 --------------------编程问答-------------------- 下次发代码能用代码标签format一下不,没法看啊! --------------------编程问答--------------------
import java.awt.*;--------------------编程问答--------------------
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.*;
public class photo extends JFrame{
JFrame frame;
Container container;
JPanel panel1;
JPanel panel2;
JButton button;
File file = null;
URL url = null;
ImageIcon imageicon;
Image image = null; //声明照片变量
//Graphics g = panel1.getGraphics();
public photo(){
frame = new JFrame();
container = frame.getContentPane();
frame.show(); //可使 他内部的组件全不可见
//container.getGraphics();
if(container.getGraphics() instanceof Graphics){ //必须先让要得到图形上下文,即得到Graphis的对象可见
System.out.println("没得到了画笔:");
}
panel1 = new JPanel();
panel2 = new JPanel();
button = new JButton("按钮");
file = new File("E:\\Media\\照片\\a.jpg");
try {
url = file.toURL();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
imageicon = new ImageIcon(url);
panel1.add(button);
panel2.setBackground(Color.red);
//p(container.getGraphics());
imageicon.paintIcon(container, container.getGraphics(), 0, 0);
frame.show();
//repaint(); //container.getGraphics()得不到画笔啊
}
public void p(Graphics g){
imageicon.paintIcon(container, g, 0, 0);
}
/*public void paint(Graphics g){
imageicon.paintIcon(container, g, 0, 0);
}*/
public static void main(String[] args){
// TODO Auto-generated method stub
photo fr = new photo();
}
}
同意。。。
补充:Java , Java SE