import java.awt.*;
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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class caishuzi extends JFrame implements ActionListener
{
private static final long serialVersionUID = 1L;
private JPanel textpanel, buttonpanel, fopanel, downpanel;
private JButton btn;
private JTextField jtinput, jttishi;
private JLabel lbnum0, lbnum, lbtishi, lbinput;
private JTextArea tafo;
private Boolean start = false, jisuan = false, jinru = false;
MenuBar mb = new MenuBar();
Menu filemenu = new Menu("文件"), systemmenu = new Menu("系统"),
helpmenu = new Menu("帮助");
MenuItem newfile = new MenuItem("文件"), openfile = new MenuItem("打开"),
closefile = new MenuItem("关闭"), quit = new MenuItem("退出"),
inputsecret = new MenuItem("输入密码"), help = new MenuItem("帮助"),
inputcishu = new MenuItem("输入限制次数");
char[] c = new char[4];
String strsecret = "123";
int xianzhi=8;
caishuzi()
{
super("猜数字");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//this.setLocationRelativeTo(null);
// 设置菜单
filemenu.add(newfile);
filemenu.add(openfile);
filemenu.addSeparator();
filemenu.add(closefile);
newfile.setEnabled(false);
openfile.setEnabled(false);
closefile.setEnabled(false);
inputsecret.addActionListener(this);
inputcishu.addActionListener(this);
inputcishu.setEnabled(false);
systemmenu.add(inputsecret);
systemmenu.add(inputcishu);
systemmenu.add(quit);
quit.addActionListener(this);
help.addActionListener(this);
helpmenu.add(help);
mb.add(filemenu);
mb.add(systemmenu);
mb.add(helpmenu);
this.setMenuBar(mb);
Container c = this.getContentPane();
BorderLayout b = new BorderLayout();
b.setVgap(10);
c.setLayout(b);
settextpanel();
c.add(textpanel, BorderLayout.NORTH);
setbuttonpanel();
setfopanel();
setdownpanel();
c.add(downpanel, BorderLayout.CENTER);
this.setSize(680,350);
//this.setResizable(false);
//this.pack();
this.setVisible(true);
}
void settextpanel()
{
textpanel = new JPanel();
textpanel.setLayout(new FlowLayout());
lbinput = new JLabel("输入：");
jtinput = new JTextField("", 10);
jtinput.setEditable(false);
jttishi = new JTextField(30);
lbnum = new JLabel("8");
lbnum0 = new JLabel("剩余次数：");
lbtishi = new JLabel("提示：");
jttishi.setEditable(false);
textpanel.add(lbinput);
textpanel.add(jtinput);
textpanel.add(lbtishi);
textpanel.add(jttishi);
textpanel.add(lbnum0);
textpanel.add(lbnum);
}
void setbuttonpanel()
{
String[] str =
{ "7", "8", "9", "4", "5", "6", "1", "2", "3", "确定", "0", "退格" };
buttonpanel = new JPanel();
buttonpanel.setLayout(new GridLayout(4, 3, 4, 8));
for (int i = 0; i str.length; i++)
{
btn = new JButton(str[i]);
btn.addActionListener(this);
buttonpanel.add(btn);
}
}
void setfopanel()
{
JButton btnright = new JButton("正确答案");
JPanel p = new JPanel();
btnright.addActionListener(this);
fopanel = new JPanel();
fopanel.setLayout(new BorderLayout());
btn = new JButton("开始");
btn.addActionListener(this);
tafo = new JTextArea(15,12);
p.setLayout(new GridLayout(1, 2));
p.add(btn);
p.add(btnright);
fopanel.add(p, BorderLayout.NORTH);
tafo.setEditable(false);
fopanel.add(tafo, BorderLayout.CENTER);
}
void setdownpanel()
{
downpanel = new JPanel();
downpanel.setLayout(new GridLayout(1, 2, 30, 0));
downpanel.add(buttonpanel);
downpanel.add(fopanel);
}
public static void main(String[] args)
{
new caishuzi();
}
public void actionPerformed(ActionEvent e)
{
String s = e.getActionCommand();
if (s.equals("退出"))
{
int i = JOptionPane.showConfirmDialog(this, "确认退出？", "",
JOptionPane.YES_NO_OPTION);
//System.out.println(i);
if (i == 0)
{
System.exit(0);
}
}
if (s.equals("帮助"))
{
JOptionPane.showMessageDialog(this,
"猜数字游戏，可以输入限制次数，密码为123,\n在菜单：系统——输入密码 中输入！");
}
if (s.equals("输入密码"))
{
while (true)
{
String inputValue = "";
inputValue = JOptionPane.showInputDialog(this, "输入密码");
// System.out.println(inputValue);
if (inputValue == null)
return;
if (inputValue.equals(strsecret))
{
jinru = true;
jttishi.setText("密码正确，点击开始");
inputsecret.setEnabled(false);
break;
} else
{
int i = JOptionPane.showConfirmDialog(this, "密码错误，重新输入？",
"", JOptionPane.YES_NO_OPTION);
if (i == 1)
break;
}
}
}
if (!jinru)
{
jttishi.setText("请输入密码：");
return;
}
if (s.equals("开始") || s.equals("重玩"))
{
StringBuffer sb = new StringBuffer("0123456789");
for (int i = 0; i c.length; i++)
{
int n = (int) (Math.random() * sb.length());
c[i] = sb.charAt(n);
sb.deleteCharAt(n);
}
btn.setText("重玩");
start = true;
lbnum.setText(String.valueOf(xianzhi));
jisuan = false;
//System.out.println(c);
jttishi.setText("请输入四不重复的数：");
jtinput.setText("");
tafo.setText("");
}
if (s.compareTo("0") = 0 s.compareTo("9") = 0)
{
jisuan = false;
if (!start)
jttishi.setText("点击开始！");
else
{
if (jtinput.getText().length() 4)
{
if (jtinput.getText().indexOf(s) 0)
{
jtinput.setText(jtinput.getText() + s);
if (jtinput.getText().length() 4)
jttishi.setText("还差"
+ (4 - jtinput.getText().length()) + "个数");
else
{
jttishi.setText("输入正确，点击确定");
jisuan = true;
}
} else
jttishi.setText("不能输入重复的数");
} else
{
jttishi.setText("不能超过四个数,点击确定");
jisuan = true;
}
}
}
if (s.equals("退格") start)
{
if (jtinput.getText().length() 0)
{
jtinput.setText(jtinput.getText().substring(0,
jtinput.getText().length() - 1));
jttishi.setText("还差" + (4 - jtinput.getText().length()) + "个数");
}
jisuan = false;
}
if (s.equals("确定"))
{
if (!start)
{
jttishi.setText("还没开始呢！");
return;
}
if (!jisuan)
{
jttishi.setText("输入不正确！");
return;
}
int numa = 0, numb = 0;
char[] c1 = jtinput.getText().toCharArray();
// System.out.println(c1);
for (int i = 0; i c1.length; i++)
{
for (int j = 0; j c.length; j++)
{
if (c1[i] == c[j] i != j)
{
numb++;
}
if (c1[i] == c[j] i == j)
{
numa++;
}
}
}
tafo.append(jtinput.getText() + "\t" + numa + "A" + numb + "B"
+ "\n");
jtinput.setText("");
jisuan = false;
if (numa == 4)
{
jttishi.setText("答对了，再来一局吧！");
start = false;
btn.setText("开始");
tafo.append("恭喜，答对了！ ");
} else
{
lbnum.setText(String
.valueOf(Integer.valueOf(lbnum.getText()) - 1));
if (Integer.valueOf(lbnum.getText()) == 0)
{
String str = "";
jttishi.setText("机会没有了！很遗憾");
for (int i = 0; i c.length; i++)
str += c[i];
tafo.append("超过限制次数，失败！" + "正确答案是：" + str);
start = false;
btn.setText("开始");
} else
jttishi.setText("输入四个数：");
}
}
if (s.equals("正确答案"))
{
if (!start)
{
jttishi.setText("还没开始呢！");
return;
}
String str = "";
for (int i = 0; i c.length; i++)
str += c[i];
tafo.append("正确答案是：" + str);
jttishi.setText("重新开始吧！");
start = false;
jisuan = false;
btn.setText("开始");
}
if (!start)
{
inputcishu.setEnabled(true);
} else
inputcishu.setEnabled(false);
if (s.equals("输入限制次数"))
{
while (true)
{
try
{
String str = JOptionPane.showInputDialog(this,
"输入小于15的整数数字：");
if (str == null)
return;
if (Integer.valueOf(str) = 15 Integer.valueOf(str) 0)
{
xianzhi=Integer.valueOf(str);
lbnum.setText(String.valueOf(xianzhi));
break;
} else
{
int i = JOptionPane.showConfirmDialog(this, "输入错误，重试？",
"", JOptionPane.YES_NO_OPTION);
if (i == 1)
break;
}
} catch (Exception ex)
{
int i = JOptionPane.showConfirmDialog(this, "输入错误，重试？", "",
JOptionPane.YES_NO_OPTION);
if (i == 1)
break;
}
}
}
}
}
我做课程设计的最初代码 参考下吧 运行时先看帮助~
str.matches("\\d+")
\\d就是一位数字的意思,用一个+加号就行了,是一个以上的意思
代码如下：
import java.util.Arrays;
class Circle {
private int radius;
public Circle(int radius) {
this.radius = radius;
}
public int getRadius() {
return radius;
}
public void setRadius(int radius) {
this.radius = radius;
}
@Override
public String toString() {
return "Circle [radius=" + radius + "]";
}
}
public class App {
public static void main(String[] args) throws CloneNotSupportedException {
// 创建一个包含5个元素的数组
Circle[] circles = { new Circle(2), new Circle(10), new Circle(8), new Circle(4), new Circle(12) };
System.out.println(Arrays.toString(circles));
// 排序
Arrays.sort(circles, (x, y) - Integer.compare(x.getRadius(), y.getRadius()));
System.out.println(Arrays.toString(circles));
// 查找半径为 9 的圆
int index = Arrays.binarySearch(circles, 9, (x, y) - ((Circle)x).getRadius() - (int)y);
System.out.println(index =0 ? circles[index] : "没有找到半径为 9 的圆。");
// 查找半径为 10 的圆
index = Arrays.binarySearch(circles, 10, (x, y) - ((Circle)x).getRadius() - (int)y);
System.out.println(index =0 ? circles[index] : "没有找到半径为 10 的圆。");
// 拷贝数组
Circle[] circles2 = Arrays.copyOf(circles, circles.length);
System.out.println(Arrays.toString(circles2));
}
}
其实就是python怎么读取binnary file
mnist的结构如下，选取train-images
TRAINING SET IMAGE FILE (train-images-idx3-ubyte):
[offset] [type] [value] [description]
0000 32 bit integer 0x00000803(2051) magic number
0004 32 bit integer 60000 number of images
0008 32 bit integer 28 number of rows
0012 32 bit integer 28 number of columns
0016 unsigned byte ?? pixel
0017 unsigned byte ?? pixel
........
xxxx unsigned byte ?? pixel
也就是之前我们要读取4个 32 bit integer
试过很多方法，觉得最方便的，至少对我来说还是使用
struct.unpack_from()
filename = 'train-images.idx3-ubyte'
binfile = open(filename , 'rb')
buf = binfile.read()
先使用二进制方式把文件都读进来
index = 0
magic, numImages , numRows , numColumns = struct.unpack_from('IIII' , buf , index)
index += struct.calcsize('IIII')
然后使用struc.unpack_from
'IIII'是说使用大端法读取4个unsinged int32
然后读取一个图片测试是否读取成功
im = struct.unpack_from('784B' ,buf, index)
index += struct.calcsize('784B')
im = np.array(im)
im = im.reshape(28,28)
fig = plt.figure()
plotwindow = fig.add_subplot(111)
plt.imshow(im , cmap='gray')
plt.show()
'784B'的意思就是用大端法读取784个unsigned byte
完整代码如下
import numpy as np
import struct
import matplotlib.pyplot as plt
filename = 'train-images.idx3-ubyte'
binfile = open(filename , 'rb')
buf = binfile.read()
index = 0
magic, numImages , numRows , numColumns = struct.unpack_from('IIII' , buf , index)
index += struct.calcsize('IIII')
im = struct.unpack_from('784B' ,buf, index)
index += struct.calcsize('784B')
im = np.array(im)
im = im.reshape(28,28)
fig = plt.figure()
plotwindow = fig.add_subplot(111)
plt.imshow(im , cmap='gray')
plt.show()
只是为了测试是否成功所以只读了一张图片
