老师我在练习定义多个点，绘制出折线，计算起点和终点的距离时，对x,y分开赋值时报错，无法运行，而用系列解包赋值时可以正常运行，请问这是为什么？

这是分开赋值时报的错

这是系列解包赋值时正常运行的图

代码区

x1=20,y1=30

x2=14,y2=15

x3=26,y3=27

x4=318,y4=9

x5=100,y5=54

"""x1,y1=20,30

x2,y2=14,15

x3,y3=26,27

x4,y4=318,39

x5,y5=100,54"""

import math

import turtle

turtle.color("red")

turtle.penup()

turtle.goto(x1,y1)

turtle.pendown()

turtle.goto(x2,y2)

turtle.goto(x3,y3)

turtle.goto(x4,y4)

turtle.goto(x5,y5)

s=math.sqrt((x1-x5)**2+(y1-y5)**2)

print(s)

老师，学习这个难吗？？？？？？？？？？？？？？

请问老师标识符和字符串之间具体的关系？

例如:

a_b="qinchenhaoshuai"

那么标识符就是a_b

字符串就是qinchenhaoshuai

我可以理解为标识符是字符串的一个代号（不唯一），而字符串就是具体的内容

请问我这样理解对吗

老师好，文件复制成功以后有的文件如pdf格式的文件是打不开的，显示文件已损坏，这是正常的吗？

老师你有尝试在这一节按次序按下两个方向键之后的效果呢

老师，我完全按照视频里的步骤来，但是子项目继承父项目一直报红

错误信息：Project 'com.jungle:parent:1.0-SNAPSHOT' not found

我在百度也没找出问题来

老师我不是很懂这句话是什么意思，详细讲解一下

已经解决了老师，我百度设置了自动下载jar包

老师我按照视频写代码导入了spring但是为什么实际却没有导入进去呢，那个文件夹也没有

src;
java.awt.*;
java.awt.event.KeyAdapter;
java.awt.event.KeyEvent;
java.awt.event.WindowAdapter;
java.awt.event.WindowEvent;
java.util.Date;

MyGameFrame Frame {

    Image = GameUtil.();

    Image = GameUtil.();

    Plane = Plane(, , , );
    Shell[] = Shell[];Explode ;Date = Date();
    Date ;
    = ;

    paint(Graphics g) {   g.drawImage(, , , Constant., Constant., );
        drawTime(g);

        .drawSelf(g);
        (i = ; i < .; i++) {
            ([i] != ) {
                [i].drawSelf(g);
            }
            peng = [i].getRect().intersects(.getRect());
            (peng) {
                .= ;
                (== ) {
                    = Explode(., .);
                }
                .drawMySelf(g);
            }
        }
    }

    drawTime(Graphics g) {
        Color c = g.getColor();
        Font f = g.getFont();
        g.setColor(Color.);
        (.) {
            = (System.() - .getTime()) / ;
            g.drawString(+ , , );
        } {
            (== ) {
                = Date();
                = () ((.getTime() - .getTime()) / );
            }
            g.setColor(Color.);
            g.setFont(Font(, Font., ));
            g.drawString(+ , , );
        }
        g.setColor(c);
        g.setFont(f);
    }

    launchFrame() {
        .setTitle();
        setVisible();setSize(Constant., Constant.);setLocation(, );.addWindowListener(WindowAdapter() {

            windowClosing(WindowEvent e) {
                System.();
            }
        });
        PaintThread().start();.addKeyListener(KeyMonitor());(i = ; i < .; i++) {
            [i] = Shell();
        }
    }

    PaintThread Thread {
        run() {
            () {
                repaint();{
                    Thread.();} (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    KeyMonitor KeyAdapter {

        keyPressed(KeyEvent e) {
.addDirection(e);

        }

        keyReleased(KeyEvent e) {
.minusDirection(e);
        }
    }



Image = ;

    update(Graphics g) {
        (== )
            = .createImage(Constant.,Constant.);Graphics gOff = .getGraphics();
        paint(gOff);
        g.drawImage(, , , );
    }


    main(String[] args) {
        MyGameFrame  gameFrame = MyGameFrame();
        gameFrame.launchFrame();
    }

}

为啥没有爆炸图片效果啊？

老师，我在使用Java api 创建连接Zookeeper时idea出现以下错误,在网上找了很多方法都无法解决，麻烦您帮我看一下，甚是感谢！

错误提示：

main方法所在类：

package com.zyt;

import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;

import java.io.IOException;

public class ZookeeperDemo implements Watcher {

    public static void main(String[] args) throws IOException {

        ZooKeeper zooKeeper = new ZooKeeper("192.168.242.128:2181,192.168.242.128:2182,192.168.242.128:2183",15000, new ZookeeperDemo());

        //zooKeeper.create("");
    }

    @Override
    public void process(WatchedEvent event) {

        if(event.getState() == Event.KeeperState.SyncConnected) {
            System.out.println("成功连接！");
        }
    }
}

pom.xml配置文件:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.zyt</groupId>
    <artifactId>ZookeeperDemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.6.0</version>
        </dependency>
    </dependencies>

</project>

setting.xml配置文件：

<?xml version="1.0" encoding="UTF-8"?>


<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
 

   <!--1、配置本地仓库的标签-->
   <localRepository>I:\IntelliJ Idea\localRepository</localRepository>

  <pluginGroups>
   
  </pluginGroups>

  
  <proxies>
  
  </proxies>

  
  <servers>
   
      <!--2、配置私服中仓库的访问-->
      <server>
         <id>releases</id>
         <username>deployment</username>
         <password>deployment123</password>
      </server>
      <server>
         <id>snapshots</id>
         <username>deployment</username>
         <password>deployment123</password>
      </server>

  </servers>

 
  <mirrors>
    
      <!--如果不配置私服，镜像仓库的配置方式-->
      <!--<mirror>
      <id>nexus-aliyun</id>
      <name>Nexus aliyun</name>
      <mirrorOf>central</mirrorOf>
      <url>http://maven.aliyun.com/nexus/content/groups/public</url>
      </mirror>-->
  </mirrors>

  <profiles>
    
     <!--3、Maven中插件的配置-->
     <profile>
        <!--配置私服的相关属性-->
        <id>sxt</id>
        <activation>
           <activeByDefault>false </activeByDefault>
           <jdk>1.8</jdk>
        </activation>
        <repositories>
           <repository>
              <id>public</id>
              <!--配置私服中仓库组的地址-->
              <url>http://192.168.242.128:8081/nexus/content/groups/public/</url>
              <releases>
                 <enabled>true</enabled>
              </releases>
              <snapshots>
                 <enabled>true</enabled>
              </snapshots>
           </repository>
        </repositories>
        <pluginRepositories>
           <pluginRepository>
              <id>public</id>
              <url>http://192.168.242.128:8081/nexus/content/groups/public/</url>
              <releases>
                 <enabled>true</enabled>
              </releases>
              <snapshots>
                 <enabled>true</enabled>
              </snapshots>
           </pluginRepository>
        </pluginRepositories>
     </profile>
    
      <!--Maven工程中jdk版本的配置-->
      <profile>
         <id>jdk1.8</id>
         <activation>
            <activeByDefault>true</activeByDefault>
            <jdk>1.8</jdk>
         </activation>
         <properties>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
            <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
         </properties>
      </profile>

</profiles>

   <activeProfiles>
      <!--<activeProfile>jdk1.8</activeProfile>-->
      <activeProfile>sxt</activeProfile>
   </activeProfiles>
 
</settings>

项目目录截图：

m['text']=f.read()

UnicodeDecodeError: 'gbk' codec can't decode byte 0xff in position 0: illegal multibyte sequence

和视频中一样的代码  怎么报错了

为啥炮弹刚接触时飞机画面暂停没有爆炸效果然后飞机消失？

cmd里输入java显示的不是和视频里一样的字，但是可以运行是怎么回事？

老师您好，为什么我在MySQL 命令窗口添加了主键约束并自定义约束名在Navicat for MySQL这个客户端工具中却不显示自定义的主键约束名呢？一直是默认的PRIMARY    而自定义的唯一性约束的名字则可以查到