- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
我想创建一个位数组,它将通过串行 RS232 发送到 Arduino 以控制输出引脚。
我通过创建复选框来实现这一点,选中这些复选框后会发送一个字节,其中每一位都代表一个引脚(打开或关闭)。
我已经使用按位 AND 运算实现了前 8 个复选框的代码,并打印到系统输出以确认我获得了正确的位模式。
它适用于前 7 个复选框,但第 8 个复选框不起作用,因为 java 字节已签名并且不允许我将“255”分配给字节值。有解决办法吗?
重要的代码是这一点:
private void createOutputChars(){
byte outputByte1 = 0;
byte testByte = 1;
for (int x = 0;x < 8;x++){
if (digitalPinOutputArray[x].isSelected()) {
outputByte1 += (byte) (testByte);
}
testByte = (byte) (testByte << 1);
}
printByteArray(outputByte1);
}
private void printByteArray(int inputByte) {
// print out 1 or 0
byte comparison = 0x1;
for (int x = 0;x < 8;x++)
{
if ((inputByte & comparison) > 0) {
System.out.print("1");
}
else {System.out.print("0");}
comparison = (byte) (comparison << 1);
}
System.out.println();
}
完整的可编译 Java 代码是这样的:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package my.ArduinoGUI;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ArduinoGUI extends javax.swing.JFrame {
/**
* Creates new form ArduinoGUI
*/
public ArduinoGUI() {
initCustomComponents();
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
buttonGroup1 = new javax.swing.ButtonGroup();
jPanel1 = new javax.swing.JPanel();
digitalPinPanel = new javax.swing.JPanel(new GridLayout(0, 3));
jPanel3 = new javax.swing.JPanel(new GridLayout(0, 1));
jPanel2 = new javax.swing.JPanel();
jProgressBar1 = new javax.swing.JProgressBar();
jProgressBar2 = new javax.swing.JProgressBar();
jProgressBar3 = new javax.swing.JProgressBar();
jProgressBar4 = new javax.swing.JProgressBar();
jProgressBar5 = new javax.swing.JProgressBar();
jProgressBar6 = new javax.swing.JProgressBar();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
jProgressBar7 = new javax.swing.JProgressBar();
jProgressBar8 = new javax.swing.JProgressBar();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("Outputs"));
jPanel1.setName("Outputs"); // NOI18N
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 209, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 106, Short.MAX_VALUE)
);
digitalPinPanel.setBorder(javax.swing.BorderFactory.createTitledBorder("Digital Pin State"));
digitalPinPanel.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseReleased(java.awt.event.MouseEvent evt) {
digitalPinPanelMouseReleased(evt);
}
});
digitalPinLabelArray = new javax.swing.JLabel[digitalPinTotal];
digitalPinRadioButtonArray = new javax.swing.JRadioButton[digitalPinTotal][2];
digitalPinGroupArray = new javax.swing.ButtonGroup[digitalPinTotal];
for(int x = 0; x < digitalPinTotal ; x++) {
digitalPinGroupArray[x] = new javax.swing.ButtonGroup(); // populate button group
digitalPinLabelArray[x] = new javax.swing.JLabel(); // populate label array
digitalPinLabelArray[x].setText("Pin " + (x +2));
digitalPinPanel.add(digitalPinLabelArray[x]); // add label to panel
for(int y = 0; y < 2; y++){
digitalPinRadioButtonArray[x][y] = new javax.swing.JRadioButton(); // populate radio button array
digitalPinRadioButtonArray[x][y].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
//Execute when button is pressed
System.out.println("You clicked the button");
checkOnOutputs();
}
}
);
if (y == 0) {digitalPinRadioButtonArray[x][y].setText("Input");}
if (y == 1) {digitalPinRadioButtonArray[x][y].setText("Output"); digitalPinRadioButtonArray[x][y].setSelected(true);
}
digitalPinGroupArray[x].add(digitalPinRadioButtonArray[x][y]); // assign radio buttons to group
digitalPinPanel.add(digitalPinRadioButtonArray[x][y]); // add buttons to panel
}
}
jPanel3.setBorder(javax.swing.BorderFactory.createTitledBorder("Generated Boxes"));
digitalPinOutputArray = new javax.swing.JCheckBox[digitalPinTotal];
for(int x = 0; x < digitalPinTotal ; x++) {
digitalPinOutputArray[x] = new javax.swing.JCheckBox();
digitalPinOutputArray[x].setText("Output Pin " + (x+2));
digitalPinOutputArray[x].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
//Execute when button is pressed
createOutputChars();
}
});
jPanel3.add(digitalPinOutputArray[x]);
}
jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder("Analog Pin State"));
jProgressBar1.setMaximum(1024);
jProgressBar1.setToolTipText("");
jProgressBar1.setString(Integer.toString(jProgressBar1.getValue()));
jProgressBar1.setStringPainted(true);
jProgressBar2.setMaximum(1024);
jProgressBar2.setString(Integer.toString(jProgressBar2.getValue()));
jProgressBar2.setStringPainted(true);
jProgressBar3.setMaximum(1024);
jProgressBar3.setString(Integer.toString(jProgressBar3.getValue()));
jProgressBar3.setStringPainted(true);
jProgressBar4.setMaximum(1024);
jProgressBar4.setString(Integer.toString(jProgressBar4.getValue()));
jProgressBar4.setStringPainted(true);
jProgressBar5.setMaximum(1024);
jProgressBar5.setString(Integer.toString(jProgressBar5.getValue()));
jProgressBar5.setStringPainted(true);
jProgressBar6.setMaximum(1024);
jProgressBar6.setString(Integer.toString(jProgressBar6.getValue()));
jProgressBar6.setStringPainted(true);
jLabel1.setText("Pin A0");
jLabel2.setText("Pin A1");
jLabel3.setText("Pin A6");
jLabel4.setText("Pin A7");
jLabel5.setText("Pin A3");
jLabel6.setText("Pin A2");
jLabel7.setText("Pin A4");
jLabel8.setText("Pin A5");
jProgressBar7.setMaximum(1024);
jProgressBar7.setToolTipText("");
jProgressBar7.setString(Integer.toString(jProgressBar7.getValue()));
jProgressBar7.setStringPainted(true);
jProgressBar8.setMaximum(1024);
jProgressBar8.setToolTipText("");
jProgressBar8.setString(Integer.toString(jProgressBar8.getValue()));
jProgressBar8.setStringPainted(true);
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel7)
.addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jProgressBar5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jProgressBar6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1)
.addComponent(jLabel2)
.addComponent(jProgressBar2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel8)
.addComponent(jLabel5)
.addComponent(jLabel3)
.addComponent(jProgressBar7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jProgressBar3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(18, Short.MAX_VALUE))
.addGroup(jPanel2Layout.createSequentialGroup()
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel6)
.addComponent(jProgressBar4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4)
.addComponent(jProgressBar8, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 0, Short.MAX_VALUE))))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(4, 4, 4)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jProgressBar2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel6)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jProgressBar3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel5)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jProgressBar4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel7)
.addGap(9, 9, 9)
.addComponent(jProgressBar5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel8)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jProgressBar6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jProgressBar7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jProgressBar8, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(65, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(18, 18, 18)
.addComponent(digitalPinPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 159, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(306, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addGap(23, 23, 23)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(18, 18, 18)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(digitalPinPanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
.addContainerGap())
);
digitalPinPanel.getAccessibleContext().setAccessibleName("");
pack();
}// </editor-fold>
private void digitalPinPanelMouseReleased(java.awt.event.MouseEvent evt) {
}
private void checkOnOutputs() {
// if output selected enable checkbox otherwise disable it
for (int x = 0; x < digitalPinTotal; x++) {
if (digitalPinRadioButtonArray[x][0].isSelected() == true) {
digitalPinOutputArray[x].setEnabled(false);
}
if (digitalPinRadioButtonArray[x][1].isSelected() == true) {
digitalPinOutputArray[x].setEnabled(true);
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Windows".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ArduinoGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.ButtonGroup buttonGroup1;
private javax.swing.JPanel digitalPinPanel;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JProgressBar jProgressBar1;
private javax.swing.JProgressBar jProgressBar2;
private javax.swing.JProgressBar jProgressBar3;
private javax.swing.JProgressBar jProgressBar4;
private javax.swing.JProgressBar jProgressBar5;
private javax.swing.JProgressBar jProgressBar6;
private javax.swing.JProgressBar jProgressBar7;
private javax.swing.JProgressBar jProgressBar8;
// End of variables declaration
private int digitalPinTotal = 12;
private int analogPinTotal = 8;
private javax.swing.JCheckBox[] digitalPinOutputArray;
private javax.swing.JRadioButton[][] digitalPinRadioButtonArray;
private javax.swing.ButtonGroup[] digitalPinGroupArray;
private javax.swing.JLabel[] digitalPinLabelArray;
private void initCustomComponents() {
//throw new UnsupportedOperationException("Not yet implemented");
// create checkbox array
}
private void createOutputChars(){
byte outputByte1 = 0;
byte testByte = 1;
for (int x = 0;x < 8;x++){
if (digitalPinOutputArray[x].isSelected()) {
outputByte1 += (byte) (testByte);
}
testByte = (byte) (testByte << 1);
}
printByteArray(outputByte1);
}
private void printByteArray(int inputByte) {
// print out 1 or 0
byte comparison = 0x1;
for (int x = 0;x < 8;x++)
{
if ((inputByte & comparison) > 0) {
System.out.print("1");
}
else {System.out.print("0");}
comparison = (byte) (comparison << 1);
}
System.out.println();
}
最佳答案
干脆忽略java byte是有符号的。它只会对少数操作产生影响(最显着的是关系运算符,如 >)。
按位运算符(|、&、^)提供与字节无符号时相同的位模式结果。
我会只将要控制的位数存储到组合框并像这样设置/读取位:
public static boolean isBitSet(byte b, int bitNo) {
return (b & (1 << bitNo) != 0;
}
public static byte setBit(byte b, int bitNo) {
return (byte) (b | (1 << bitNo));
}
public static byte clearBit(byte b, int bitNo) {
return (byte) (b & (~(1 << bitNo)));
}
虽然直接将 C 代码移植到 java 通常会由于缺少无符号类型而导致不同的行为,但差异并不是那么大。所有无符号类型都可以替换为有符号类型,这只需要一些注意(和知识),因为某些操作需要以不同的方式表达。
顺便说一句:没有人会耐心地挖掘 UI 构建器生成的代码墙。如果您有具体问题,请提供一个简短示例,最好是可编译和可执行的。
关于Java:按位AND创建无符号字节,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15390129/
给定一个字符串,例如 s="##$$$#",我如何找到索引之前的“#”符号数等于“”数的索引$"符号在索引之后? 示例:如果 s="##$$$#",则输出将为 2。 解释:在索引 2 之前我们有 2
在本教程中,您将借助示例了解 JavaScript 符号。 JavaScript 符号 JavaScript ES6 引入了一种新的原始数据类型,称为 Symbol(符号)。符号是不可变的(不能更改)
在“函数编程的工艺”一书中,符号 '>.>' 将函数连接在一起,与 '.' 的方向相反。但是当我使用 ghci 实现它时,它显示了超出范围的错误 '>.>'。为什么?它是不再使用的旧符号吗? 最佳答案
很难说出这里问的是什么。这个问题是含糊的、模糊的、不完整的、过于宽泛的或修辞性的,无法以目前的形式得到合理的回答。如需帮助澄清此问题以便重新打开它,visit the help center 。 已关
我需要从向量中删除 \"。这是我的数据: data <- c("\"https://click.linksynergy.com/link?id=RUxZriH*PWc&offerid=323058.1
我在 Nginx 配置中使用正则表达式来捕获文件 URL,但如果文件 URL 包含 # 符号,正则表达式模式将不会捕获它。 这里是nginx的配置部分。 location ~ ^/p/(?[\w\-=
如何使 & 符号在此图表的第一组条形/列下正确显示: http://jsfiddle.net/VxbrK/2/ 应该是“Apples & Oranges”而不是“Apples & Oranges”。
**在verilog中是什么意思? 我为测试台提供了以下逻辑 localparam NUM_INPUT_BITS = 1; localparam NUM_OUTPUT_BITS
我有一个使用正则表达式来验证电子邮件地址的方法。 public String searchFormail(String searchWord) { Pattern pattern = Patt
我想将一个字符串拆分为数字部分和文本/符号部分我当前的代码不包含负数或小数,并且表现得很奇怪,在输出的末尾添加了一个空列表元素 import re mystring = 'AD%5(6ag 0.33-
我有一些代码需要从数组中选择一个随机字符串,但它一直返回单个字母或数字。如何解决这个问题? var name = ["Yayek", "Vozarut", "Gezex",
我刚开始使用 Python,我在考虑应该使用哪种表示法。我读过 PEP 8关于 Python 符号的指南,我同意那里的大多数内容,除了函数名称(我更喜欢混合大小写风格)。 在 C++ 中,我使用匈牙利
在用 C# 编写代码时,我错误地在 if 语句中的变量前添加了一个符号(而不是感叹号)。 bool b = false; if (@b) { } 我很惊讶它编译成功,没有任何错误。 我想知道:上面的代
本文实例为大家分享了特殊字符替换电话号码中某一部分的方法,ios利用-号替换电话号码中间四位,供大家参考,具体内容如下 1、效果图 2、代码 rootviewcontroll
当我使用“x”和“z”作为符号时,这段代码没有问题: from sympy import * x, z = symbols('x z') y = -6*x**2 + 2*x*z**0.5 + 50*x
我需要从文本中删除标点符号: data <- "Type the command AT&W enter. in order to save the new protocol on modem;"
我有几个数字是 numeric 类。下面的例子。 df = c(12974,12412,124124,124124,34543,4576547,32235) 现在我想在每个数字前添加 '$' 符号而不
我有一个 highcharts 图例,其中符号以不同的大小显示,因为它们在实际图表中的大小不同。不幸的是,当数据点的大小增加时,它们也会在图例中增加。无论数据点大小如何,我都希望图例符号保持相同的大小
我需要使用包含平均值+-SD的标题。到目前为止,我只能得到以下信息: "Mean +- SD or N (%)" [1] "Mean +- SD or N (%)" 如何直接使用“+-”符号?您知道一
使用 XSLT 和 XPath 1.0,我有一个要转义的字符串以用于 URL,例如: one word & another 因此,描述元素的 text() 应该进行 URL 转义。 我该怎么做
我是一名优秀的程序员,十分优秀!