把依赖全写到pojo里有没有事，然后mapper调用pojo依赖，service调用mapper依赖，controller调用service依赖。

class Employee :

    id=1000

    def __init__(self,name,salary):
        Employee.id += 1  #这行为什么不能是self,为什么这样能实现加employee指的是什么
        self.name=name
        self.__salary=salary

java.util.Scannerzuoqiu {
    (String[] args){
        Scanner scanner=Scanner(System.)System..println()System..println()(){
            System..println()System..println()monthSalary= scanner.nextInt()System..println()months =scanner.nextInt()yearsalary=monthSalary*monthsSystem..println()scanner.nextLine()String mingling=scanner.nextLine()System..println(mingling+)String command=scanner.nextLine()System..println(command+)(.equals(command)){
                System..println()}
            (.equals(command)){
                System..println()}
            (yearsalary>&&yearsalary<){
                System..println()}
            (yearsalary>=){
                System..println()}
            System..println(+yearsalary)}



    }

老师他这里还让我输入12我要在打一个字才出来恭喜你。。。。

视频上是不需要在打12就出来的，我这里咋弄才能不用打12直接出来下面的字？

老师你好，我在VSCode执行的时候并没有出现乱码的情况，如果出现乱码的情况，这又怎么进行调试呢？

老师，我也看了很多类似的问题，但是还是解决不了。麻烦帮忙看看路径有啥问题？谢谢！我也尝试着改绝对路径，还是解决不了

zookeeper连接不成功，什么原因造成的？已经修改过超时连接的时间。

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-02-15 23:32:05.730 ERROR 15944 --- [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalStateException: zookeeper not connected
    at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:83) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:68) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.zookeeper.ZookeeperRegistry.<init>(ZookeeperRegistry.java:85) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.zookeeper.ZookeeperRegistryFactory.createRegistry(ZookeeperRegistryFactory.java:42) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.support.AbstractRegistryFactory.getRegistry(AbstractRegistryFactory.java:121) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.RegistryFactoryWrapper.getRegistry(RegistryFactoryWrapper.java:34) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.RegistryFactory$Adaptive.getRegistry(RegistryFactory$Adaptive.java) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.integration.RegistryProtocol.getRegistry(RegistryProtocol.java:298) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:204) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:60) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.qos.protocol.QosProtocolWrapper.export(QosProtocolWrapper.java:64) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:143) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:470) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:315) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:287) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:205) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.bootstrap.DubboBootstrap.lambda$exportServices$13(DubboBootstrap.java:873) ~[dubbo-2.7.5.jar:2.7.5]
    at java.base/java.util.HashMap$Values.forEach(HashMap.java:981) ~[na:na]
    at org.apache.dubbo.config.bootstrap.DubboBootstrap.exportServices(DubboBootstrap.java:861) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.bootstrap.DubboBootstrap.start(DubboBootstrap.java:703) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onContextRefreshedEvent(DubboBootstrapApplicationListener.java:52) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onApplicationContextEvent(DubboBootstrapApplicationListener.java:45) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.spring.context.OneTimeExecutionApplicationContextEventListener.onApplicationEvent(OneTimeExecutionApplicationContextEventListener.java:40) ~[dubbo-2.7.5.jar:2.7.5]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:897) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at com.bjsxt.ErpApplication.main(ErpApplication.java:16) [classes/:na]
Caused by: java.lang.IllegalStateException: zookeeper not connected
    at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:80) ~[dubbo-2.7.5.jar:2.7.5]
    ... 38 common frames omitted

package com.company;

public class kaobei {
    public static void main(String[] args) {
        String []S={"阿里","尚学堂","京东","搜狐","网易"};
        String []U=new String[6];
         System.arraycopy(S,0,U,0,S.length);
       for(int i=0;i<U.length;i++){
        System.out.print(U[i]+"\t");
      }
    }
}


C:\Users\Y\.jdks\openjdk-15.0.2\bin\java.exe "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\lib\idea_rt.jar=53488:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\bin" -Dfile.encoding=UTF-8 -classpath C:\Users\占兵兵\IdeaProjects\TG\out\production\TG com.company.kaobei
阿里	尚学堂	京东	搜狐	网易	null	
Process finished with exit code 0

为什么运行结果的空隙不一样？

 ide ctrl加鼠标单击为啥没有源码

这几个装饰器的怎样使用,@property和@password.setter是什么意思

老师，对于服务端的主函数的代码这样子写可不可以呢

print(os.path.split(path))

的结果是('C:\\Users\\26284\\PycharmProjects\\pythonProject\\02', 'e.text')

但当我

from os import path

然后使用

print(path.split(path))

结果就变成了

这是为什么呢？

而且用path.的话有些属性用不了，必须要os.path.

class ageError(Exception):
    def __int__(self,errorInfo):
        Exception.__init__(self) #Exception是所有异常的父类，init()是初始化方法。在自定义异常中，使用Exception.init(self)来调用父类的初始化方法
        self.errorInfo=errorInfo
    def __str__(self):
        return str(self.errorInfo)+",年龄错误"
'''if __name__ == '__main__'的意思是：
    当.py文件被直接运行时，if __name__ == '__main__'之下的代码块将被运行；
    当.py文件以模块形式被导入时，if __name__ == '__main__'之下的代码块不被运行。'''
if __name__=="__main__":
    age=int(input("请输入年龄"))
    if age<1 or age>100:
        raise ageError(age)  #raise 抛出异常
    else:
        print("正常的年龄",age)

请问我跟着老师的代码敲的，不知道为什么还是出现以下错误

package com.company.shuzu;

public class Text02 {

     public static void main(String[] args) {
        Man[] mans = {
                new Man(10, "高一"),
                new Man(20, "高二"),
                new Man(30, "高三"),
                new Man(40, "高四"),
                new Man(50, "高五")
        };
        for (int i = 0; i < mans.length; i++) {
            System.out.println(mans[i].getName());
        }
    }

    class  Man {
        private int id;
        private String name;

        public Man(){}

        public Man(int id, String name) {
            this.id = id;
            this.name = name;
        }

        public int getId() {

            return id;
        }

        public void setId(int id) {

            this.id = id;
        }

        public String getName() {

            return name;
        }

        public void setName(String name) {

            this.name = name;
        }
    }
}

int[ ] arr1=null;和int  arr1[ ]=new  int[1],为什么前面的初始化是null,后面的默认初始化是0？

创建了一个新项目后，再打开idea原来的代码就都没了。应该怎么操作才能使新建后再打开idea原来的代码也还存在？