XDo0

Iterator< Map.Entry< Integer,String>> it = hashmap.entrySet().iterator();   
  while (it.hasNext()) {   
   Map.Entry< Integer,String> entry = it.next();   
   // entry.getKey()    
   // entry.getValue()   
   System.out.print(entry.getValue());   
  }   

XDo0

# Only one-level subfolders are supported
import os

def get_files(DIR):
    file_list=list()
    for sub_dir in os.listdir(DIR):
        if os.isdir(sub_dir):
            for file in os.listdir(os.path.join(DIR,sub_dir)):
                file_list.append(file)
    return file_list

XDo0

def addtwodimdict(thedict, key_a, key_b, val):
  if key_a in adic:
    thedict[key_a].update({key_b: val})
  else:
    thedict.update({key_a:{key_b: val}})

XDo0

//string 2 list
List<String> l=Arrays.asList(s.split(""));

// array 2 list(except 8 basic types),reference type
List<T> l=Arrays.asList(array);

//8 basic types arrays 2 list, such as Integer
List list=new ArrayList();
double array[]={12,223,234};
for(int i=0;i<array.length;i++){

XDo0

// extend
System.arraycopy(names, 0, extended, 0, names.length);

// difference
objArray.removeAll(objArray2);
// intersection
objArray.retainAll(objArray2);
// union
Set<String> set = new HashSet<String>();
...

XDo0

import java.io.*;
 
public class Main {
    public static void main(String[] args) throws Exception {
        File temp = File.createTempFile("tmp", ".txt");
        System.out.println("File Path: "+temp.getAbsolutePath());
      
        Date filetime = new Date(temp.lastModified());
        System.out.println(filetime.toString());
        System.out.println(fileToChange.setLastModified(System.currentTimeMillis()));

XDo0

class ExceptionOperations{
	try
	{
		//...
	}
	catch (ArithmeticException e)  
        {  
            System.out.println(e.toString());  
        }  
	catch (ArrayIndexOutOfBoundsException e)  

XDo0

import java.util.Base64;

public class MyBase64{

  public static String base64(String str,int mode) throws InvalidParameterException{
          if (mode == 1) {
              byte[] bytes = str.getBytes();
              //Base64 加密
              String encoded = Base64.getEncoder().encodeToString(bytes);
              return encoded;

XDo0

from subprocess import PIPE,Popen
import logging

logger = logging.getLogger('dev.utils')
logger.setLevel(logging.WARNING)
logging.basicConfig(filename='./log/'+datetime.now().strftime(f'{__file__}_%H_%M_%d_%m_%Y.log'),
                    filemode='a',
                    level=logging.WARNING,
                    format='%(asctime)s  %(message)s',
                    datefmt='%d %b %Y %H:%M:%S')

XDo0

from bs4 import BeautifulSoup,SoupStrainer
import requests

def crawl_url(keyword):
  url=f"https://www.google.com/search?q={keyword}"
  response = requests.get(url)
  soup = BeautifulSoup(response.content, 'lxml')
  all_tags=soup.find_all("div",attrs={"data-version-added":True})
#  all_catas=soup.find_all(class_="devsite-nav-text")
#...