import java.util.*; import java.util.stream.*; class Test { public static void main(String[] args) { List list = new ArrayList(); list.add("Hello"); list.add("Hello"); list.add("World"); Map counted = list.stream() .collect(Collectors.groupingBy(Function.identity(), Collectors.counting())); System.out.println(counted); } } https://stackoverflow.com/questions/25441088/how-can-i-count-occurrences-..
public static void printList(List list) { for (Object elem: list) System.out.print(elem + " "); System.out.println(); } You use the unbounded wildcards when the list (or the collection) is of unknown types. https://stackoverflow.com/questions/29342117/what-is-the-purpose-of-list-if-one-can-only-insert-a-null-value
hdfs dfs -rm -r https://stackoverflow.com/questions/13529114/how-to-delete-a-directory-from-hadoop-cluster-which-is-having-comma-in-its-na How to Delete a directory from Hadoop cluster which is having comma(,) in its name? I have uploaded a Directory to hadoop cluster that is having "," in its name like "MyDir, Name" when I am trying to delete this Directory by using rmr hadoop shell command as ..
https://stackabuse.com/encode-a-string-to-utf-8-in-java/ Encode a String to UTF-8 in Java In this tutorial, we'll take a look at how to encode a String to UTF-8 in Java - using StandardCharsets, getBytes() with ByteBuffer and Apache Commons with examples. stackabuse.com
https://hydroponicglass.tistory.com/134 [JAVA] 정수의 최대값, 최소값 출력 자바에서 정수의 최대값, 최소값 출력 // java public static void main(String[] args) { System.out.println(Integer.MAX_VALUE); // 2147483647 System.out.println(Integer.MIN_VALUE); // -2147483648 } 32비.. hydroponicglass.tistory.com
int[] array = list.stream().mapToInt(i -> i).toArray(); https://stackoverflow.com/questions/960431/how-to-convert-listinteger-to-int-in-java How to convert List to int[] in Java? This is similar to this question: How to convert int[] to Integer[] in Java? I'm new to Java. How can i convert a List to int[] in Java? I'm confused because List.toArray() actually stackoverflow.com
file -bi myfile.txt https://stackoverflow.com/questions/1730878/encoding-of-file-shell-script encoding of file shell script How can I check the file encoding in a shell script? I need to know if a file is encoded in utf-8 or iso-8859-1. Thanks stackoverflow.com
System.out.println(String.valueOf(Charset.defaultCharset())); https://stackoverflow.com/questions/1006276/what-is-the-default-encoding-of-the-jvm What is the default encoding of the JVM? Is UTF-8 the default encoding in Java? If not, how can I know which encoding is used by default? stackoverflow.com
private static RestTemplate restTemplate; static { HttpComponentsClientHttpRequestFactory rf = new HttpComponentsClientHttpRequestFactory(); rf.setReadTimeout(3 * 1000); rf.setConnectTimeout(2 * 1000); restTemplate = new RestTemplate(rf); restTemplate.getMessageConverters() .add(0, new StringHttpMessageConverter(StandardCharsets.UTF_8)); } https://stackoverflow.com/questions/13837012/spring-rest..
$ git clone https://github.com/username/repo.git Username: your_username Password: your_token https://docs.github.com/en/github/authenticating-to-github/keeping-your-account-and-data-secure/creating-a-personal-access-token Creating a personal access token - GitHub Docs You should create a personal access token to use in place of a password with the command line or with the API. docs.github.com
yourDf .coalesce(1) // if you want to save as single file .write .option("sep", "\t") .option("encoding", "UTF-8") .csv("outputpath") https://stackoverflow.com/questions/61063446/how-to-write-a-spark-dataframe-tab-delimited-as-a-text-file-using-java How to write a spark dataframe tab delimited as a text file using java I have a Spark Dataset with lot of columns that have to be written to a text ..
from pyspark.sql import SparkSession, Row spark = SparkSession.builder.getOrCreate() data = [Row(id=u'1', probability=0.0, thresh=10, prob_opt=0.45), Row(id=u'2', probability=0.4444444444444444, thresh=60, prob_opt=0.45), Row(id=u'3', probability=0.0, thresh=10, prob_opt=0.45), Row(id=u'80000000808', probability=0.0, thresh=100, prob_opt=0.45)] df = spark.createDataFrame(data) df.show() # +-----..
>>> line = '1234567890' >>> n = 2 >>> [line[i:i+n] for i in range(0, len(line), n)] ['12', '34', '56', '78', '90'] https://stackoverflow.com/questions/9475241/split-string-every-nth-character Split string every nth character? Is it possible to split a string every nth character? For example, suppose I have a string containing the following: '1234567890' How can I get it to look like this: ['12',..
from pyspark.sql.functions import lit df = sqlContext.createDataFrame( [(1, "a", 23.0), (3, "B", -23.0)], ("x1", "x2", "x3")) df_with_x4 = df.withColumn("x4", lit(0)) df_with_x4.show() ## +---+---+-----+---+ ## | x1| x2| x3| x4| ## +---+---+-----+---+ ## | 1| a| 23.0| 0| ## | 3| B|-23.0| 0| ## +---+---+-----+---+ https://stackoverflow.com/questions/33681487/how-do-i-add-a-new-column-to-a-spark-d..
Row(name="Alice", age=11).asDict() == {'name': 'Alice', 'age': 11} https://spark.apache.org/docs/3.1.1/api/python/reference/api/pyspark.sql.Row.asDict.html pyspark.sql.Row.asDict — PySpark 3.1.1 documentation Return as a dict Parameters recursivebool, optionalturns the nested Rows to dict (default: False). Notes If a row contains duplicate field names, e.g., the rows of a join between two DataFr..
df = df.withColumnRenamed("colName", "newColName")\ .withColumnRenamed("colName2", "newColName2") https://stackoverflow.com/questions/34077353/how-to-change-dataframe-column-names-in-pyspark How to change dataframe column names in pyspark? I come from pandas background and am used to reading data from CSV files into a dataframe and then simply changing the column names to something useful using ..
Row(**row_dict) https://stackoverflow.com/questions/38253385/building-a-row-from-a-dict-in-pyspark Building a row from a dict in pySpark I'm trying to dynamically build a row in pySpark 1.6.1, then build it into a dataframe. The general idea is to extend the results of describe to include, for example, skew and kurtosis. Here's wh... stackoverflow.com
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