{"id":89737,"date":"2024-09-23T18:00:23","date_gmt":"2024-09-23T12:30:23","guid":{"rendered":"https:\/\/techvidvan.com\/tutorials\/?p=89737"},"modified":"2024-09-23T18:59:32","modified_gmt":"2024-09-23T13:29:32","slug":"java-string-join-method","status":"publish","type":"post","link":"https:\/\/techvidvan.com\/tutorials\/java-string-join-method\/","title":{"rendered":"Java String join() Method with Examples"},"content":{"rendered":"

The join() method requires two inputs.<\/p>\n

Elements:<\/strong>\u00a0the items that need to be linked together delimiter – the delimiter Any class that implements CharSequence may be sent to join().<\/p>\n

If one is passed, the elements of an iterable will be combined. The iterable must implement CharSequence. Because these classes implement CharSequence, they are CharSequence.<\/p>\n

When the static String concatenates each string, a delimiter is placed between them. The join() method, which is part of the String class, creates a single string by joining the provided string and the delimiter.<\/p>\n

Syntax:<\/h2>\n

Both public static String join (CharSequence deli, Iterable? extends CharSequence> ele) and public static String join (CharSequence deli, CharSequence… ele) are available.<\/p>\n

Parameters:<\/strong><\/p>\n

Each element must have a delimiter associated with it. The delimiter may be a string or character.<\/p>\n

Returns a joined string with a delimiter.<\/p>\n

Example:<\/strong><\/p>\n

class Techvidvan{\r\n    public static void main(String args[])\r\n    {\r\n        \/\/ delimiter is \"<\" and elements are \"Four\", \"Five\", \"Six\", \"Seven\"\r\n        String gfg1 = String.join(\" < \", \"Four\", \"Five\", \"Six\", \"Seven\");\r\n  \r\n        System.out.println(gfg1);\r\n    }\r\n}<\/pre>\n
\"java<\/a><\/p>\n
For instance, omitting the StringJoiner class and the String.join() function Approach:<\/strong><\/p>\n
We won’t be using Java 8 in this program; instead, we’ll attempt to complete it manually and see how much larger a code base or number of steps were required to accomplish our objective.<\/p>\n
First, we will unite the three strings “DSA,” “FAANG,” and “ALGO,” using the delimiter “gfg.” To do this, we must write the delimiter each time before a new string is added.<\/p>\n
We will next unite the components of an ArrayList containing the strings “DSA,” “FAANG,” and “ALGO” using the delimiter “gig. ” To do this, we had to iterate over the ArrayList.<\/p>\n
Notes:<\/strong><\/p>\n
Elements:<\/strong> A char value with a delimiter must be appended, and a combined string with a delimiter is returned.<\/p>\n
If the element or delimiter is null, the exception throws a NullPointerException.<\/p>\n
Example:<\/strong><\/p>\n
\/\/ Java program to demonstrate \r\n\/\/ working of join() method \r\n\r\n\r\nclass Gfg3 { \r\n  public static void main(String args[]) \r\n  { \r\n    \/\/ delimiter is \"->\" and elements are \"Wake up\", \r\n    \/\/ \"Eat\", \"Play\", \"Sleep\", \"Wake up\" \r\n\r\n\r\n    String gfg3 = String.join(\"-> \", \"Wake up\", \"Eat\", \r\n          \"Play\", \"Sleep\", \"Wake up\"); \r\n\r\n\r\n    System.out.println(gfg3); \r\n  } \r\n} \r\npublic class StringJoinExample3   \r\n{  \r\n\/\/ main method  \r\npublic static void main(String argvs[])  \r\n{  \r\nString str = null;  \r\nstr = String.join(null, \"abc\", \"bcd\", \"apple\");  \r\nSystem.out.println(str);  \r\n}  \r\n}<\/pre>\n
Output:<\/strong><\/p>\n
Exception in thread “main” java.lang.NullPointerException
\nat java.base\/java.util.Objects.requireNonNull(Objects.java:221)
\nat java.base\/java.lang.String.join(String.java:2393)
\nat StringJoinExample3.main(StringJoinExample3.java:7)
\nusing System;
\nusing System.Collections.Generic;<\/p>\n
Example:<\/strong><\/p>\n
public class Example\r\n{\r\n   public static void Main()\r\n   {\r\n      int maxPrime = 100;\r\n      List<int> primes = GetPrimes(maxPrime);\r\n      Console.WriteLine(\"Primes less than {0}:\", maxPrime);\r\n      Console.WriteLine(\"   {0}\", String.Join(\" \", primes));\r\n   }\r\n\r\n\r\n   private static List<int> GetPrimes(int maxPrime)\r\n   {\r\n      Array values = Array.CreateInstance(typeof(int), \r\n                              new int[] { maxPrime - 1}, new int[] { 2 });\r\n      \/\/ Use Sieve of Eratosthenes to determine prime numbers.\r\n      for (int ctr = values.GetLowerBound(0); ctr <= (int) Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))); ctr++)\r\n      {\r\n                           \r\n         if ((int) values.GetValue(ctr) == 1) continue;\r\n         \r\n         for (int multiplier = ctr; multiplier <=  maxPrime \/ 2; multiplier++)\r\n            if (ctr * multiplier <= maxPrime)\r\n               values.SetValue(1, ctr * multiplier);\r\n      }      \r\n      \r\n      List<int> primes = new List<int>();\r\n      for (int ctr = values.GetLowerBound(0); ctr <= values.GetUpperBound(0); ctr++)\r\n         if ((int) values.GetValue(ctr) == 0) \r\n            primes.Add(ctr);\r\n      return primes;\r\n   }   \r\n}\r\n\r\n\r\n\/\/ The example displays the following output:\r\n\/\/    Primes less than 100:\r\n\/\/       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97<\/pre>\n
NOTES:<\/strong><\/p>\n
String is returned.
\nA string made up of value items separated by a separator string.<\/p>\n
-or-<\/strong><\/p>\n
If values contain no elements, it is empty.<\/p>\n
Exceptions<\/h3>\n
The values of ArgumentNullException are null.<\/p>\n
OutOfMemoryException<\/h3>\n
The generated string’s length exceeds the maximum allowable length (Int32.MaxValue).<\/p>\n
Conclusion<\/h3>\n
The java string join() method connects all strings with a delimiter specified by the user. Because this method is a static method of the Java String class, we don’t need to construct any objects to use it.<\/p>\n","protected":false},"excerpt":{"rendered":"
The join() method requires two inputs. Elements:\u00a0the items that need to be linked together delimiter – the delimiter Any class that implements CharSequence may be sent to join(). If one is passed, the elements...<\/p>\n","protected":false},"author":6,"featured_media":447400,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[183],"tags":[5596,288,289,327,250,5598,5599],"class_list":["post-89737","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java-string-join","tag-java-string-join-method","tag-java-string-join-method-with-example","tag-java-tutorials","tag-learn-java","tag-string-join-method-in-java","tag-string-join-with-example"],"yoast_head":"\nJava String join() Method with Examples - TechVidvan<\/title>\n<meta name=\"description\" content=\"The java string join() method connects all strings with a delimiter specified by the user. 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