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java画一个矩形代码 用java画一个图形
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java 画矩形
你的代码有问题java画一个矩形代码，你的类本身是frame，你也在类中绘制，但是你却没有显示，而是另外定义java画一个矩形代码了一个frame来显示，你修改一下：
import java.awt.Color;
import java.awt.Component;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Rectangle;
public class FrameTest extends Frame {
/**
* @param args
*/
public void paint(Graphics g)
{
super.paint(g);
g.setColor(Color.black);
g.fillRect(100, 100, 30, 30);
try {
Thread.sleep(500);
}
catch (Exception ex) {
ex.printStackTrace();
}
//repaint();
}
FrameTest()
{
super("title");
setLocation(100,100);
setSize(600,400);
setVisible(true);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
FrameTest ft=new FrameTest();
}
}
这样应该没问题java画一个矩形代码了。
相关问答
Q1: 写一个java程序，使其画一个正方形并改变它的颜色（每秒钟改变一次）。求完整代码谢谢
按照java画一个矩形代码你java画一个矩形代码的要求,编写java画一个矩形代码的Java程序如下
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
public class F extends JFrame implements Runnable{
Color[] colors = {Color.red,Color.orange,Color.yellow,Color.green,Color.cyan,Color.blue,Color.magenta,Color.black};
int i=0;
F(){
setTitle("变色正方形");
setSize(400, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public void paint(Graphics g){
g.setColor(colors[i]);
g.drawRect(100,100,200,200);
}
@Override
public void run() {
while(true){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
if(i7)
i++;
else
i=0;
repaint();
}
}
public static void main(String[] args) {
F f=new F();
Thread t=new Thread(f);
t.start();
}
}
运行结果
Q2: java中做一个按钮，点击按钮后画一个矩形的代码怎么写？
兄弟帮你写了一个：
import java.awt.Button;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Random;
public class Print {
public static void main(String[] args) {
new Te();
}
}
class Te extends Frame implements ActionListener {
Color cc = Color.red;
int x = -20, y = -50;
Random r = new Random();
public Te() {
this.setLayout(null);
Button b = new Button("画圆");
this.add(b);
b.setBounds(30,30,50,50);
b.addActionListener(this);
this.addWindowListener(new WindowAdapter () {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
this.setBounds(200,200,500,400);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
this.cc = Color.red;
this.x = r.nextInt(400);
do {
int x1 = r.nextInt(300);
this.y = x1;
} while (this.y 50);
this.repaint();
}
@Override
public void paint(Graphics g) {
Color c = g.getColor();
g.setColor(cc);
g.drawRect(x,y,50,50);
g.setColor(c);
}
}
Q3: java画矩形
直接说event是简单，不过总要试一试才敢拿上来讲，所以就全写上来了。。。
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.MouseInputAdapter;
import javax.swing.event.MouseInputListener;
public class Test {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new PaintingPanel());
frame.setBounds(100, 100, 400, 400);
frame.setVisible(true);
}
}
class PaintingPanel extends JPanel {
ArrayListRectangle list;
Rectangle current;
public PaintingPanel() {
list = new ArrayListRectangle();
addMouseMotionListener(mouseHandler);
addMouseListener(mouseHandler);
}
MouseInputListener mouseHandler = new MouseInputAdapter() {
Point startPoint;
public void mousePressed(MouseEvent e) {
startPoint = e.getPoint();
current = new Rectangle();
}
public void mouseReleased(MouseEvent e) {
makeRectangle(startPoint, e.getPoint());
if (current.width 0 current.height 0) {
list.add(current);
current = null;
repaint();
}
}
public void mouseDragged(MouseEvent e) {
if (current != null) {
makeRectangle(startPoint, e.getPoint());
repaint();
}
}
private void makeRectangle(Point p1, Point p2) {
int x = Math.min(p1.x, p2.x);
int y = Math.min(p1.y, p2.y);
int w = Math.abs(p1.x - p2.x);
int h = Math.abs(p1.y - p2.y);
current.setBounds(x, y, w, h);
}
};
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.BLACK);
for (Rectangle rect : list) {
g.fillRect(rect.x, rect.y, rect.width, rect.height);
}
if (current != null) {
g.drawRect(current.x, current.y, current.width, current.height);
}
}
}
Q4: 初学 用Java画一个空的矩形 谁帮我看看有没有更简便方法
代码如下：
public class FunctionTest {
public static void main(String[] args) {
int m = 7, n = 10;
for (int i = 0; i m; i++) {
for (int j = 0; j n; j++) {
if (i == 0 || i == (m - 1)) {
System.out.print("*");
} else if (j == 0 || j == (n - 1)) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
}
运行结果：
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