这里synchronized的代码块根本运行不进去是什么原因呢老师

老师：

      你好， 这样的什么原因？

Traceback (most recent call last):

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 58, in <module>

    from tensorflow.python.pywrap_tensorflow_internal import *

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 28, in <module>

    _pywrap_tensorflow_internal = swig_import_helper()

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 24, in swig_import_helper

    _mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)

  File "C:\Programs\Python\Python38\lib\imp.py", line 242, in load_module

    return load_dynamic(name, filename, file)

  File "C:\Programs\Python\Python38\lib\imp.py", line 342, in load_dynamic

    return _load(spec)

ImportError: DLL load failed while importing _pywrap_tensorflow_internal: 找不到指定的模块。

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "C:/Users/george/AppData/Local/Temp/tensorflow_loader.py", line 2, in <module>

    import tensorflow as tf

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\__init__.py", line 41, in <module>

    from tensorflow.python.tools import module_util as _module_util

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\python\__init__.py", line 50, in <module>

    from tensorflow.python import pywrap_tensorflow

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 69, in <module>

    raise ImportError(msg)

ImportError: Traceback (most recent call last):

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 58, in <module>

    from tensorflow.python.pywrap_tensorflow_internal import *

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 28, in <module>

    _pywrap_tensorflow_internal = swig_import_helper()

  File "C:\Programs\Python\Python38\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 24, in swig_import_helper

    _mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)

  File "C:\Programs\Python\Python38\lib\imp.py", line 242, in load_module

    return load_dynamic(name, filename, file)

  File "C:\Programs\Python\Python38\lib\imp.py", line 342, in load_dynamic

    return _load(spec)

ImportError: DLL load failed while importing _pywrap_tensorflow_internal: 找不到指定的模块。

Failed to load the native TensorFlow runtime.

See https://www.tensorflow.org/install/errors

for some common reasons and solutions.  Include the entire stack trace

above this error message when asking for help.

super().__init__(master), 
super(Application,self).init(master),
Frame.__init__(self,master)
这三个一样吗？

老师这个uni什么意思，是来做什么的?pri我知道是主键。

老师为什么出错

老师，我maven结合idea出现这个错误，配置的是阿里云的仓库

老师这个语句运行为什么报错，Navicat运行出错：1136 - Column count doesn't match value count at row 6

-- 创建雇员表

create table emp(

 empno int(4) primary key,

 ename varchar(10),

 job varchar(9),

 mgr int(4),

 hiredate date,

 sal decimal(7,2),

 comm decimal(7,2),

 deptno int(2)

);

-- 插入数据

insert into emp values

(7369,'Smith','clerk', 7902,'1980-12-17', 800, null, 20),

(7499,'Allen', 'salesman', 7698, '1981-02-20', 1600, 300, 30),

(7521, 'Ward','salesman', 7698,'1981-02-22', 1250,500, 30),

(7566,'Jones', 'manager', 7839, '1981-04-02', 2975,null, 20),

(7654,'Maritn', 'salesman', 7698, '1981-09-28', 1250, 1400,30),

(7698,'Blake''manager', 7839, '1981-05-01', 2850, null,30),

(7782,'Clark', 'manager', 7839,'1981-06-09', 2450, null, 10),

(7788,'Scott','analyst', 7566, '1987-04-19', 3000,null, 20),

(7839, 'King', 'president',null, '1981-11-17', 5000, null, 10),

(7844, 'Turner', 'salesman', 7698, '1981-09-08', 1500, 0, 30),

(7876,'Adams', 'clerk', 7788, '1987-05-23', 1100, null, 20),

(7900,'James', 'clerk', 7698, '1981-12-03', 950, null, 30),

(7902,'Ford', 'analyst', 7566, '1981-12-03', 3000, null, 20),

(7934,'Miller', 'clerk', 7782, '1982-01-23', 1300,null, 10);

Student {
    (String[] args) {
        Student student = Student()student.=System..println(student.)}
}

我没定义构造方法为什么还能运行

图片加载不出来，格式正确   换了图片也不行，是需要解码？我记得不用吧

请问下，老师的可以在idea上的代码点击报错的FileRead展开FileRead类，我本地的无法点击打开，是需要怎么设置吗

package string;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class Test02 {
    public static void main(String[] args) {
        FileReader reader= null;
        try {
            reader = new FileReader("d:/a.txt");
            char c =(char)reader.read();
            char c2=(char)reader.read();
            System.out.println(""+c+c2);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e){
            e.printStackTrace();
        }
        finally {
            try {
                if(reader!=null){
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}

这个怎么快速复制的

老师这里 怎么替换成ha呢。。。。。。。。。。。。

老师，extend方法和append方法的区别是什么呢？

看到有同学问的这样一个问题，也引发了我的思考

于是查了查网上的帖子，发现，不是所有泛型都有所谓的泛型擦除效果的。

package com.Jin;

import org.apache.commons.io.IOUtils;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class TestIOUtils {
    public static void main(String[] args) throws IOException {
        String str = IOUtils.toString(new FileInputStream("D:\\a.txt"));
        System.out.println(str);
    }
}

为什么toString显示字符串(输入流)'已弃用

结果