小编Cod*_*tan的帖子

我已经完成了题为"以编程方式设置AWS区域1"的问题,但它没有提供我需要的所有答案.

Q1:我得到了SDKClientException-Unable to find a region via the region provider chain.我究竟做错了什么？还是我错过了一个错字.

public class CreateS3Bucket {

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

    BasicAWSCredentials creds = new BasicAWSCredentials("aws-access-key", "aws-secret-key");
    AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(creds)).build();

    Region region = Region.getRegion(Regions.US_EAST_1);
    s3Client.setRegion(region);

    try {
        String bucketName = "testBucket" + UUID.randomUUID();
        s3Client.createBucket(bucketName);
        System.out.println("Bucket Created Successfully.");

    } catch(AmazonServiceException awse) {

        System.out.println("This means that your request made it AWS S3 but got rejected");
        System.out.println("Error Message:" +awse.getMessage());
        System.out.println("Error Message:" +awse.getErrorCode());
        System.out.println("Error Message:" +awse.getErrorType());
        System.out.println("Error Message:" …

我在 MAC 上执行命令pip3 install awscli --upgrade --user并得到以下信息：

boto3 1.8.8 has requirement botocore<1.12.0,>=1.11.8, but you'll have botocore 1.12.160 which is incompatible.
boto3 1.8.8 has requirement s3transfer<0.2.0,>=0.1.10, but you'll have s3transfer 0.2.0 which is incompatible.

我正在寻找解决方法。

提前致谢。

我知道静态内容首先被加载到内存中,但为什么在'CT'之前打印'IT'时我没有提到它是静态的？

class Person
{
    Person()
    {
        System.out.print(" CP");
    }

    static 
    {
        System.out.print("SP");
    }
}

class Teacher extends Person
{
    Teacher()
    {
        System.out.print(" CT");
    }

    {
        System.out.print(" IT");
    }
}


public class StaticTest 
{
    public static void main(String[] args) 
    {       
        Person p = new Teacher();
    }
}

我理解静态关键字的目的但遗憾的是我无法弄清楚这个简单的代码.不知道为什么？我期待答案非常简单.

public class VariableScope {

    int x=y;
    static int y=5;

    public static void main(String[] args) {
        System.out.println(new VariableScope().x); 
    }
}

当y在早期分配给它时,x如何打印为5？

这是一个从.txt文件中读取所有内容的简单代码.不确定是什么问题.我尝试了一个不同的测试文件,它只读取了line2和line4 null.它甚至不应该null按照while循环条件读取.

import java.io.*;
import java.util.*;

public class FileInput {

    public ArrayList<String> readFile() {
        ArrayList<String> content = new ArrayList<>();

        try {
            File file = new File("input.txt");
            BufferedReader br = new BufferedReader(new FileReader(file)); 

            String line = null;

            while (br.readLine() != null) {
                line = br.readLine();
                content.add(line);
                System.out.println(line);
            }

        } catch (FileNotFoundException e) {
            System.out.println("File could not be found. " + e.getMessage());
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }

        return content;
    }

    public static void main(String []args) {

        FileInput …

已经有人问过类似的问题：在 conda 中解决包分辨率

Solving environment: /
Warning: 2 possible package resolutions (only showing differing packages):
  - defaults/noarch::path.py-12.0.2-py_0, defaults/osx-64::path-13.2.0-py37_0
  - defaults/noarch::path.py-12.4.0-0, defaults/osx-64::path-13.1.0-py37done

已经尝试了以下方法：

conda update --strict-channel-priority --all
conda update --all
conda update anaconda
conda update conda

似乎没有什么可以解决这个问题！将非常感谢任何帮助。

康达信息 ==> http://dpaste.com/2951Y1J

康达版本：4.8.3

conda 构建版本：3.18.11

操作系统：Mac OS 10.14 Mojave

TIA