Oracle
docs.oracle.com › javase › 8 › docs › api › java › lang › String.html
String (Java Platform SE 8 )
October 20, 2025 - The string "boo:and:foo", for example, yields the following results with these expressions: ... the array of strings computed by splitting this string around matches of the given regular expression ... Returns a new String composed of copies of the CharSequence elements joined together with a copy of the specified delimiter. ... String message = String.join("-", "Java", "is", "cool"); // message returned is: "Java-is-cool" Note that if an element is null, then "null" is added.
GeeksforGeeks
geeksforgeeks.org › java › strings-in-java
Java Strings - GeeksforGeeks
Here, Sachin is not changed but a new object is created with “Sachin Tendulkar”. That is why a string is known as immutable. As we can see in the given figure that two objects are created but s reference variable still refers to "Sachin" and not to "Sachin Tendulkar". But if we explicitly assign it to the reference variable, it will refer to the "Sachin Tendulkar" object. Example: Java program to assign the reference explicitly in String using String.concat() method.
Published February 12, 2019
Videos
11:26
Java Tutorial for Beginners - String in Java - YouTube
Java 8 for Testers #26 - Array,String,StringBuilder explained
01:38:15
Session 8- Working with Java Strings | String Methods | Java & ...
02:34
Java Tutorials for Beginners - 8 - STRINGS | WHAT IS A STRING - ...
11:54
Java 8 for Testers #27 - Array,String & StringBuilder demo - YouTube
02:01
Java String Basics - YouTube
Java8
java8.info › apicontents › string.html
Java 8 - The String Class
Lets look at some code to illustrate the above scenario and prove that the str1 and str2 reference variables point to the same object, so that we can see the reuse of strings in the string constant pool: package info.java8; /* String immutability and the String Constant Pool */ import static java.lang.Math.acos; public class TestString { public static void main(String[] args) { String str1 = "java"; System.out.println("str1 = " + str1); str1 = "tutor"; System.out.println("str1 = " + str1); str1 = "javatutor"; String str2 = "javatutor"; System.out.println("str1 = " + str1); System.out.println("str2 = " + str2); System.out.println(str1 == str2); } }
Oracle
oracle.com › webfolder › technetwork › tutorials › obe › java › String › String.html
Java SE 8: Getting Started with String Processing
StringTokenizer object, retrieves the number of tokens, and displays the number of generated tokens in the console. For the single parameter constructor, this example demonstrates where you break the source text at the default set of delimiters (for example, whitespace and newline). ... Tokenizer.java and select Run File.
W3Schools
w3schools.com › java › java_ref_string.asp
Java String Reference
Java Examples Java Videos Java Compiler Java Exercises Java Quiz Java Code Challenges Java Server Java Syllabus Java Study Plan Java Interview Q&A Java Certificate ... The String class has a set of built-in methods that you can use on strings.
Winterbe
winterbe.com › posts › 2015 › 03 › 25 › java8-examples-string-number-math-files
Java 8 API by Example: Strings, Numbers, Math and Files - winterbe
In this example we use the stream operation filter to achieve the same behavior as in the previous example. Reading text files into memory and writing strings into a text file in Java 8 is finally a simple task. No messing around with readers and writers. The method Files.readAllLines reads all lines of a given file into a list of strings.
GitHub
github.com › openjdk › jdk › blob › master › src › java.base › share › classes › java › lang › String.java
jdk/src/java.base/share/classes/java/lang/String.java at master · openjdk/jdk
For example: * <blockquote><pre> * String str = "abc"; * </pre></blockquote><p> * is equivalent to: * <blockquote><pre> * char data[] = {'a', 'b', 'c'}; * String str = new String(d
Author openjdk
Java Code Geeks
examples.javacodegeeks.com › home › java development › core java
Java String Methods Java 8 - Java 14 - Examples Java Code Geeks - 2025
March 30, 2020 - The join method is used to specifying a new string which acts as the separator between the specified strings. Running the example above produces the following output: ... The two new methods added as part of Java 9 are chars and codePoints. They are very similar to each other except that they exhibit different behavior when surrogate pairs are used.
Oracle
docs.oracle.com › en › java › javase › 11 › docs › api › java.base › java › lang › String.html
String (Java SE 11 & JDK 11 )
January 20, 2026 - For example, String message = String.join("-", "Java", "is", "cool"); // message returned is: "Java-is-cool" Note that if an element is null, then "null" is added. Parameters: delimiter - the delimiter that separates each element · elements - the elements to join together.
Medium
medium.com › @appeshreddy › java-string-evolution-from-java-8-to-21-unlocking-the-power-of-strings-b0a972fb4aa5
Java String Evolution From Java 8 to 21 — Unlocking the Power of Strings! 🚀 | by Appesh | Medium
October 29, 2024 - String name = "Appesh"; String greeting = STR."Hello, {name}!"; ... From Java 8 to Java 21, the String class has evolved significantly. It gained new friends (Stream API), got lighter (Compact Strings), learned new tricks (Java 11 methods), ...
Oracle
docs.oracle.com › javase › 8 › docs › api › java › lang › StringBuilder.html
StringBuilder (Java Platform SE 8 )
October 20, 2025 - The append method always adds these characters at the end of the builder; the insert method adds the characters at a specified point. For example, if z refers to a string builder object whose current contents are "start", then the method call z.append("le") would cause the string builder to ...
Oracle
docs.oracle.com › javase › 9 › docs › api › java › lang › String.html
String (Java SE 9 & JDK 9 )
For example, String message = String.join("-", "Java", "is", "cool"); // message returned is: "Java-is-cool" Note that if an element is null, then "null" is added. Parameters: delimiter - the delimiter that separates each element · elements - the elements to join together.
Java Concept Of The Day
javaconceptoftheday.com › home › java new string methods – from java 8 to java 17
Java New String Methods - From Java 8 To Java 17
February 26, 2022 - From time to time, new methods are added to String class so that working with strings becomes effortless and simple. join() in Java 8, chars() and codePoints() in Java 9, isBlank(), lines(), repeat(), strip(), stripLeading() and stripTrailing() ...
Oracle
docs.oracle.com › javase › 7 › docs › api › java › lang › String.html
String (Java Platform SE 7 )
All string literals in Java programs, such as "abc", are implemented as instances of this class. Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example:
Top answer 1 of 3
6
The exception asks you for an array instead comma-sepparated strings:
// incorrect
String.format("%02d:%02d:%02d",hour,minute,second);
// fast but correct
Object[] data = { hour, minute, second };
String.format("%02d:%02d:%02d", data);
But actually, method format(String,object[]) does not exists in String, it is: format(String pattern, Object... arguments) what should work with commas ,. There is something with your syntax, but not in the shown code.
2 of 3
1
A real answer to this problem is only your type int. You don't have to use Object specifically but you have to use a type that inherit from Object and int is a raw type that does not inherit from Object, like all raw types. So you can use Integer instead of int to solve your problem.
DigitalOcean
digitalocean.com › community › tutorials › java-string
Java String | DigitalOcean
August 3, 2022 - A new static method join() has been added in String class in Java 8. This method returns a new String composed of copies of the CharSequence elements joined together with a copy of the specified delimiter. Let’s look at an example to understand it easily.
Medium
medium.com › buzz-code › java-8-string-method-2-6e3ef7ce883e
Java 8 | String Method 2
February 9, 2021 - Java 8 | String Method 2 Hi y’all! In one of my old post I was talking about three String methods charAt(), equals(), length(). Java 8 | String Method Method — A block of code that performs …
Top answer 1 of 3
8
Use Stream.concat inside the flatMap operation:
references.stream()
.flatMap(user -> Stream.concat(
Stream.of(user.getId()),
user.getExternalIds().stream()
))
.collect(Collectors.toList())
2 of 3
1
Try this:
references.stream()
.flatMap(u -> Stream.of(List.of(u.getId()), u.getExternalIds()))
.flatMap(List::stream)
.collect(Collectors.toList());
Oracle
docs.oracle.com › javase › tutorial › java › data › strings.html
Strings (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)
The Java platform provides the String class to create and manipulate strings.