Java recipes

This code is a Java function that takes a file path as an argument and returns a list of all the files within that path, including those in any subdirectories. The function first creates a list all to store the files it finds, and then creates a File object for the given path and gets an array of all its files and directories using the listFiles() method. The code then checks if the list of files is not null, which can occur in case of an access error. If the list is not null, the code iterates through the list and adds each file to the all list. If a file is a directory, the code recursively calls the listAllFiles method with the absolute path of the directory to find all its files. The final list of all files is returned at the end.

Java: list files in directory recursively

This code defines a static method called listFilesInDirectory, which takes a single File object folder as its argument. The method returns an array of File objects that correspond to the files in the given folder. The listFiles method of the File class is used to retrieve an array of all the files and directories in the folder, but we're using a method reference to only return the files in the folder by passing the isFile method as a filter. The returned array contains only the File objects that represent files (not directories).

Java: list files in directory

This code defines a method listDirectories that takes a string argument path, which is the path to a directory. The method returns an array of File objects representing the subdirectories within the directory specified by path. To do this, it creates a File object based on the path argument and then uses the listFiles method to get a list of all the files and directories in the directory represented by the File object. It then filters this list by passing a reference to the isDirectory method of the File class as an argument to listFiles, so that only the directories are included in the returned list.

Java: list directories

This code defines a Java method named decodeBase64 that takes a Base64 encoded String as input and returns the decoded String. The decoded data is obtained using the Base64.getDecoder().decode method, which takes the input string encoded in Base64 and returns the decoded data as a byte[]. The resulting byte[] is then converted into a String and returned as the result of the decodeBase64 method.

Java: base64 decode string

The encodeBase64 method takes a string input and returns its base64 encoded representation. It uses the getEncoder method of the Base64 class to get a Base64.Encoder object, and then calls the encodeToString method of the encoder to encode the input string. The getBytes method is used to convert the input string into a sequence of bytes, which is the input required by the encodeToString method.

Java: base64 encode string

This Java code defines a findMax function that takes an integer array as an argument. The function first converts the input array into a stream using Arrays.stream. Then, it uses the reduce method to find the maximum value in the stream. The reduce method takes two arguments: an initial value (in this case, Integer.MIN_VALUE) and a binary operator (in this case, Integer::max). The binary operator is applied to each element in the stream and the initial value, and the reduce method returns the final result.

In this case, the function returns the maximum value in the input array.

Java: find max value of array

This code defines a method called arraySum that takes an array of integers as an argument and returns the sum of its elements. It does this by creating a stream of integers from the input array using the stream method from the Arrays class and then using the sum method from the stream class to compute and return the sum.

Java: find sum of array

This code calculates the median of an array of integers by first sorting the array and then finding the middle element(s). If the number of elements in the array is odd, the median is simply the middle element. If the number of elements is even, the median is the average of the two middle elements.

Java: find median of array

This method takes in an array of generic type T, converts the array into a stream, and then uses the distinct and count methods to determine if all elements in the array are the same. The method returns a boolean indicating whether all elements in the array are equal.

Java: find mean of array

The code defines a generic method allEqual that takes an array arr of type T as an argument. It then uses the stream method of the Arrays class to convert the array into a stream, eliminates duplicates using the distinct method, and counts the number of elements using the count method. The method returns true if all elements in the array are equal, and false otherwise.

Java: check if all elements of array are equal

The code defines a Java method called nArrayConcat that takes as input two or more arrays of type T and returns a single array that is the result of concatenating all input arrays. The method first calculates the total length of all arrays by adding up the lengths of each array. It then creates a new array with this calculated length and copies all elements from the first array into this new array. Finally, it copies all elements from the rest of the arrays into the new array and returns the new array as the result.

Java: N array concatenation

The code provided is a Java method that concatenates two arrays of generic type T and returns the resulting array. It uses the Arrays.copyOf method to create a new array with the length of the sum of the lengths of the two input arrays, and the System.arraycopy method to copy the elements of the second array into the new array starting from the end of the first array. The final result is then returned.

Java: two array concatenation

In this code, the linearSearch function takes in an integer array arr and an integer item. It performs a linear search on the array, looking for the item. If the item is found, the function returns its index in the array. If the item is not found, the function returns -1.

Java: linear search

This code implements a counting sort algorithm in Java, which is a sorting algorithm that operates by counting the number of objects having distinct key values (kind of values present in an array). The algorithm works by counting the number of occurrences of each number in the input array and then using this information to place the numbers in their correct order in the output array. The algorithm has a time complexity of O(n + k), where n is the number of elements in the input array and k is the range of the numbers.

Java: counting sort

This code is an implementation of the Insertion Sort algorithm in Java. The Insertion Sort algorithm sorts an array of integers in ascending order by iterating through the array and inserting each element into its correct position relative to the sorted portion of the array.

The code begins by looping through the array starting from the second element (index 1). For each iteration, the current element is stored in a temporary variable. The code then compares the current element with the elements before it, and keeps moving these elements to the right until it finds an element that is smaller than the current one or until it reaches the start of the array. Finally, the current element is inserted into its correct position.

The algorithm continues this process until all elements in the array are sorted in ascending order.

Java: insertion sort

The selectionSort function takes an array of integers as an argument, sorts it in ascending order using the Selection Sort algorithm, and returns nothing.

The algorithm iterates over the array twice, once to select the minimum element, and again to swap it with the first unsorted element. This process is repeated until all elements in the array are sorted.

Java: selection sort

This code implements a simple bubble sort algorithm in Java. The bubble sort algorithm sorts an array of integers by repeatedly swapping adjacent elements that are out of order, until the entire array is sorted in ascending order.

Java: bubble sort

The QuickSort algorithm is a divide-and-conquer algorithm that sorts an array by selecting a pivot element and partitioning the other elements into two sub-arrays, according to whether they are less than or greater than the pivot. The sub-arrays are then sorted recursively. The quickSort method implements this algorithm in Java.

Java: quick sort

The mergeSort function uses a recursive approach to sort the elements in the input array. It first checks if the low index is greater than or equal to the high index, which is the base case. If so, it returns. If not, it calculates the middle index, sorts the first and second halves of the array by calling mergeSort recursively, and then merges the two sorted arrays by calling the merge function.

The merge function takes in the input array, the low and high indices, and the middle index as parameters. It creates a temporary array to store the sorted elements, and uses two indices to keep track of the elements in the two subarrays to be merged. It then iterates through the subarrays and adds the smaller elements to the temp array. Finally, it copies the elements from the temp array back to the original array.

Java: merge sort

 postgres

The sudo -i command allows the user to become the superuser. The -u postgres command sets the user's username to be "postgres". The psql postgres command executes the PostgreSQL command prompt.

Opening a Postgres Prompt


const props2 = defineProps2<{
  foo: {
  type: String,
  defaultProps: props
  }
  bar?: {
  type: number,
  defaultProps: emit.defaultProps
  }
  }>()

The first code block defines a new object called props which has two properties: foo and bar . The second code block defines a new object called props2 which has the same properties as props , but also defines a new property called foo which has the type String and the defaultProps property set to the values defined in props .

define props and emits vue 3 with typescript

reduce


This code creates a window that contains a table. The table has three columns: "time", "count", and "goal". The "time" column is updated each time the window is opened. The "count" and "goal" columns are updated whenever data is added to the table. The "total_count" column is updated whenever data is removed from the table.

2626

django



This code prints "hello world" on the screen.

Error

profile



This style instructs the browser to create a circle with a radius of 25 pixels, 50px in width and height, and a transparent background of #c00. The circle is placed at the top-left corner of the document, with its center positioned at 0px, and will transition to appear as if it was positioned at the bottom-left corner of the page 1 second after being created.

Bouncing Ball


The code creates a 50x50px square object inside a div with the id of ball. Inside that object is a script which calculates the positions of the object's corners (x=0, y=0) and its center (x=window.innerWidth-90, y=window.innerHeight-90). It then updates the left and top values of the ball's style attribute using the current position and direction. Finally, a requestAnimationFrame is called to keep the ball animated.

dlibbb

dwdwdwdwdw


  else:
    sock.sendto(data, addr, 1024)


The code first imports the socket module and sets up a socket instance on localhost at UDP_IP and UDP_PORT. It then binds the socket to the port specified. Once bound, it starts accepting messages from the socket. When a message is received, it is decoded and if it is a valid message, the program prints out the message and exits. If the message is not a valid message, it is sent to the socket.

UDP Test



This prints "Hello world...." on your terminal.

Python_Snippet

hello,world



The code specifies that two properties in the model should have a value of false.

snipet1



The code calculates the random number between the min and max values and adds it to the min value.

在指定范围生产随机数



The code in question is used to transfer stablecoins from one address to another. In this case, the sender (bid) is sending stablecoins from their address to the address of the recipient (address(this)), and a fee is being paid.

grid fees


 import paho.mqtt.client as mqtt
from loguru import logger
import time
import threading

# Set up logging
logger.add("logs/logs_{time}.log", rotation="1 day")
logger.add("http://loki:3100/api/prom/push", level="DEBUG", format="{message}")

def mqtt_client(host, port, topic, keepalive=60):
  # Initialize the MQTT client
  client = mqtt.Client()

  # Connect to the MQTT broker
  client.connect(host, port, keepalive)

  # Subscribe to a topic
  client.subscribe(topic)

  # Callback for handling incoming messages
  def on_message(client, userdata, message):
    logger.debug("Received message: " + str(message.payload.decode("utf-8")))

  client.on_message = on_message

  # Start the MQTT client loop
  client.loop_start()

# Dedicated thread for the MQ

MQTT Monitoring

angular

where Object could be your new model.
the object should have a DateTime and all events are grouped on whether they have the same date. If so, then they become nested.
{ datetime: DateTime, newObject[] }

Group Events



The code tries to get the desktop of the user by using the browse method of the Desktop object. If an IOException or URISyntaxException is thrown, the stack trace of the exception is printed.

open browser



The class Result holds two String objects. It has a constructor that takes two String objects as arguments. The Result object also has two public methods. The first method returns an Optional object that will either hold the value of the first String object or the value of the second String object, depending on whether the first String object is null or not. The second method returns an Optional object that will hold either the value of the first String object or the value of the second String object, depending on whether the second String object is null or not.

create a nullable result class

]]

This code creates a record that inherits from the UserInput field in the current recordset. TheUserInput: field will be populated with the input from the user.

create a record



In this code, the ffmpeg command is used to decode the input_video.MTS file and encode it to the output_video.MTS file. The -segment_time option is used to specify the time period for the segment. The -reset_timestamps option is used to reset the timestamps in the output file to 00:20:00. The output file will have the file name output_video%%03d.MTS.

cut video into pieces

Guava





The code creates a list of strings that does not contain null values.

Lambda filtre nonull on list



The "print" statement prints "Hello" to the console.

print hello



The code in this example changes the title's CSS style to make it black, yellow, and with a dashed red border.

Change CSS by selector



When the code executes, it will set the innerHTML of the #mainTitle element to "This new <u>title</u> has been changed from JavaScript!"

Change HTML text by selector



The code in this function gets the current position of the browser and puts it into two variables: latitude and longitude. Next, the code creates a map using L.map() and sets the view to be at the latitude and longitude given. Finally, the code creates a tile layer using the key api at cloudmade.com and adds it to the map. When the user clicks on the marker, a popup will show up with the user's location.

Get current geolocation on map


 

This code is defining a recursive function that takes a list as an argument. The function will loop through the list and print each item. It will also keep track of a list of items that are waiting to be processed. If the length of the waiting list equals 0, the function will return and the list will be processed.

bfs recursion


 

In this code, the 'aux_rod' variable is used to keep track of the last move.

Tower of Hanoi



The code in the above example creates a modal box and listens for the "DOMContentLoaded" event. When this event is triggered, the modal box opens and displays the input fields.

When the user enters valid information in one of the input fields, the code executes the "healthCheck" function. This function checks to see if the user's entered information matches one of the predefined health check values. If the user's information does not match one of the predefined values, an alert is displayed and the function returns false.

snip nip

api/v1/users/

The /api/v1/users/ endpoint provides a list of all the users in the system.

Name	Language	Author	Uses
Java: list files in directory recursively	Java	TD Tara Dwyer	0
Java: list files in directory	Java	TD Tara Dwyer	0
Java: list directories	Java	TD Tara Dwyer	0
Java: base64 decode string	Java	TD Tara Dwyer	0
Java: base64 encode string	Java	TD Tara Dwyer	0
Java: find max value of array	Java	TD Tara Dwyer	1
Java: find sum of array	Java	TD Tara Dwyer	0
Java: find median of array	Java	TD Tara Dwyer	0
Java: find mean of array	Java	TD Tara Dwyer	0
Java: check if all elements of array are equal	Java	TD Tara Dwyer	0
Java: N array concatenation	Java	TD Tara Dwyer	0
Java: two array concatenation	Java	TD Tara Dwyer	0
Java: linear search	Java	TD Tara Dwyer	1
Java: counting sort	Java	TD Tara Dwyer	1
Java: insertion sort	Java	TD Tara Dwyer	0
Java: selection sort	Java	TD Tara Dwyer	1
Java: bubble sort	Java	TD Tara Dwyer	7
Java: quick sort	Java	TD Tara Dwyer	0
Java: merge sort	Java	TD Tara Dwyer	0
Opening a Postgres Prompt	JavaScript	A Allmacht	0
define props and emits vue 3 with typescript	TypeScript	A Allmacht	0
reduce	Java	MV Mike Verba	0
2626	Python	MA Mohamed Amine. Ben Said	0
Error	Python	E Errorray33	0
profile	PHP	HT Hasan Tayar	0
Bouncing Ball	CSS	K Krithbekma	0
Bouncing Ball	HTML	K Krithbekma	0
dlibbb	Python	DM Dhouib Mohamed	0
dwdwdwdwdw	Python	MG Marco Gala	0
UDP Test	Python	DC Duncan Coombe	0
Python_Snippet	Python	p phamky1	0
hello,world	Python	ss shu shen	0
snipet1	C#	CF Codiga Fan #28080	0
在指定范围生产随机数	JavaScript	r redfieldw	0
grid fees	Solidity	p pgupta119	0
MQTT Monitoring	Python	KC Kuang-Cheng Chien	0
Group Events	TypeScript	P Plazmodium	1
open browser	Java	MV Mike Verba	0
create a nullable result class	Java	MV Mike Verba	1
create a record	Java	MV Mike Verba	1
cut video into pieces	JavaScript	AE Azariah Ekpe	0
Lambda filtre nonull on list	Java	MA Manuel Antunes	0
print hello	Python	KC Kuang-Cheng Chien	2
Change CSS by selector	JavaScript	MS Melissah Schulz	0
Change HTML text by selector	JavaScript	MS Melissah Schulz	0
Get current geolocation on map	JavaScript	MS Melissah Schulz	0
bfs recursion	Python	KQ Knight Qu	0
Tower of Hanoi	Python	KQ Knight Qu	1
snip nip	JavaScript	RB Royi Barboy	0
Links	Java	MC Miguel Calle Contreras	0

Codiga Snippets, page 7