下边这个程序虽然很简单,但是很长,不好意思,浪费您宝贵的时间。
我是个java的初学者,真心的希望您能帮帮我。
谢谢您!
import java.awt.*;
import java.awt.geom.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
public class JFrame_9 extends javax.swing.JFrame
{
public JFrame_9()
{
initComponents ();
pack ();
SketchFrame frame = new SketchFrame();
frame.show();
}
private void initComponents() {
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
}
}
);
}
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit (0);
}
class SketchFrame extends JFrame
{
public SketchFrame()
{
setTitle("Sketch");
setSize(500,500);
SketchPanel panel = new SketchPanel();
Container contentPane = getContentPane();
contentPane.add(panel);
}
}
class SketchPanel extends JPanel
{
public SketchPanel()
{
last = new Point2D.Double(100,100);
lines = new ArrayList();
KeyHandler listener = new KeyHandler();
addKeyListener(listener);
setFocusable(true);
}
public void add(int dx,int dy)
{
Point2D end = new Point2D.Double(last.getX() + dx,last.getY() + dy);
Line2D line = new Line2D.Double(last,end);
lines.add(line);
repaint();
last = end;
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
for(int i = 0;i<lines.size();i++)
g2.draw((Line2D)lines.get(i));
}
private Point2D last;
private ArrayList lines;
private static final int SM = 1;
private static final int LA = 5;
private class KeyHandler implements KeyListener
{
public void keyPressed(KeyEvent event)
{
int keyCode = event.getKeyCode();
int d;
if(event.isShiftDown())
d= LA;
else
d = SM;
if(keyCode == KeyEvent.VK_LEFT) add(-d,0);
else if (keyCode == KeyEvent.VK_RIGHT) add(d,0);
else if (keyCode ==KeyEvent.VK_UP) add(0,-d);
else if (keyCode == KeyEvent.VK_DOWN) add(0,-d);
}
public void keyReleased(KeyEvent event){}
public void keyTyped(KeyEvent event)
{
char keyChar = event.getKeyChar();
int d;
if(Character.isUpperCase(keyChar))
{
d = LA;
keyChar = Character.toLowerCase(keyChar);
}
else
d = SM;
}
}
}
public static void main (String args[]) {
new JFrame_9 ().show ();
}
}
为什么运行以后会出现这种情况,setFocusable()函数是不是没有被import ?
JFrame_9.java [73:1] No method found matching setFocusable(boolean)
setFocusable(true);
^
1 error
不好意思,浪费您这么长时间,
谢谢您了!
我是个java的初学者,真心的希望您能帮帮我。
谢谢您!
import java.awt.*;
import java.awt.geom.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
public class JFrame_9 extends javax.swing.JFrame
{
public JFrame_9()
{
initComponents ();
pack ();
SketchFrame frame = new SketchFrame();
frame.show();
}
private void initComponents() {
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
}
}
);
}
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit (0);
}
class SketchFrame extends JFrame
{
public SketchFrame()
{
setTitle("Sketch");
setSize(500,500);
SketchPanel panel = new SketchPanel();
Container contentPane = getContentPane();
contentPane.add(panel);
}
}
class SketchPanel extends JPanel
{
public SketchPanel()
{
last = new Point2D.Double(100,100);
lines = new ArrayList();
KeyHandler listener = new KeyHandler();
addKeyListener(listener);
setFocusable(true);
}
public void add(int dx,int dy)
{
Point2D end = new Point2D.Double(last.getX() + dx,last.getY() + dy);
Line2D line = new Line2D.Double(last,end);
lines.add(line);
repaint();
last = end;
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
for(int i = 0;i<lines.size();i++)
g2.draw((Line2D)lines.get(i));
}
private Point2D last;
private ArrayList lines;
private static final int SM = 1;
private static final int LA = 5;
private class KeyHandler implements KeyListener
{
public void keyPressed(KeyEvent event)
{
int keyCode = event.getKeyCode();
int d;
if(event.isShiftDown())
d= LA;
else
d = SM;
if(keyCode == KeyEvent.VK_LEFT) add(-d,0);
else if (keyCode == KeyEvent.VK_RIGHT) add(d,0);
else if (keyCode ==KeyEvent.VK_UP) add(0,-d);
else if (keyCode == KeyEvent.VK_DOWN) add(0,-d);
}
public void keyReleased(KeyEvent event){}
public void keyTyped(KeyEvent event)
{
char keyChar = event.getKeyChar();
int d;
if(Character.isUpperCase(keyChar))
{
d = LA;
keyChar = Character.toLowerCase(keyChar);
}
else
d = SM;
}
}
}
public static void main (String args[]) {
new JFrame_9 ().show ();
}
}
为什么运行以后会出现这种情况,setFocusable()函数是不是没有被import ?
JFrame_9.java [73:1] No method found matching setFocusable(boolean)
setFocusable(true);
^
1 error
不好意思,浪费您这么长时间,
谢谢您了!
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