I hope you can better understand with this example:
W3Schools
w3schools.com › java › ref_string_substring.asp
Java String substring() Method
The substring() method returns a substring from the string.
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I hope you can better understand with this example:
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Java's substring inputs,
public String substring(int beginIndex,int endIndex)
beginIndex - the beginning index, inclusive.
endIndex - the ending index, exclusive.
Note the exclusive. substring(0,1) will return a string including character 0, up to but NOT including character 1.
Source: http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#substring(int, int)
[JAVA] Substring method question about indexing.
Index 0 does refer to R. The range of the substring method is [beginIndex, endIndex). So what you have says to start at the beginning, then include only things before the first character, which is nothing, so you get an empty string. If you want just the first character you need substring(0, 1). It may be easier to think of if you consider the parameters to be beginIndex and beginIndex + substringLength. More on reddit.com
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April 11, 2013Why does the substring method in the String class create a new object and return that memory address rather than the information itself or interning it into the String Pool and returning that memory address?
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September 27, 2022How to correctly use the substring method? (Java)
You are deeply confused about how substring() works - it's a method of String, and it does not take Strings as parameters. See here for an example. More on reddit.com
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February 2, 2013[JAVA] Best practice to obtain substring using index of a character that may not be in original string.
Step through the string, one character at a time, looking for a comma. If you reach either the end of the string or a comma, you know what the first id is. More on reddit.com
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April 10, 201508:05
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Codecademy
codecademy.com › docs › java › strings › .substring()
Java | Strings | .substring() | Codecademy
April 28, 2025 - Yes, string indexing in Java starts at 0, so the first character of a string is at index 0. When using the substring() method, the beginIndex parameter follows this zero-based indexing.
GeeksforGeeks
geeksforgeeks.org › java › substring-in-java
Java String substring() Method - GeeksforGeeks
April 11, 2025 - In Java, the substring() method of the String class returns a substring from the given string. This method is most useful when you deal with text manipulation, parsing, or data extraction. This method either takes 1 parameter or 2 parameters, i.e., start and end value as arguments.
Vultr Docs
docs.vultr.com › java › standard library › java › lang › string › substring()
Java String substring() - Extract Substring | Vultr Docs
January 1, 2025 - The substring() method in Java is a fundamental tool for string manipulation, allowing developers to extract specific parts of a string based on given index positions.
BeginnersBook
beginnersbook.com › 2013 › 12 › java-string-substring-method-example
Java String substring() Method with examples
substring(0, str.length()-1): This excludes last character as the length() method returns the length of the string and when we provide str.length()-1 as the endIndex, it excludes last character. public class JavaExample{ public static void main(String args[]) { String str= new String("Pasta"); ...
IONOS
ionos.ca › digital guide › websites › web development › java substrings
How to use the Java substring method - IONOS CA
January 6, 2025 - As mentioned above, there are two ways to use Java’s substring() method. The first only defines the starting point of the substring that you want to extract. It breaks up the string from that index to the last character of the string.
Reddit
reddit.com › r/learnprogramming › [java] substring method question about indexing.
r/learnprogramming on Reddit: [JAVA] Substring method question about indexing.
April 11, 2013 -
Specifically this:
substring(int beginIndex, int endIndex)
Given:
String test = "Reddit"
I had thought index 0 to refer to R, 1 to e, 2 to d, etc.
But, turns out, running code:
String new = test.substring(0,0);
System.out.println(new);
Will return a value of: "". Just "".
That's how I found out index 0 did not refer to "R" of String test.
My question is:
What does index 0 refer to when using the substring method?
Software Testing Help
softwaretestinghelp.com › home › java › java substring() method – tutorial with examples
Java substring() Method - Tutorial With Examples
April 1, 2025 - Here, we will take an input String ... the substring starting from the zeroth index and ending on the zeroth index. It will be interesting to see how the program responds. As we have the starting and ending indexes as the same, it should return a blank. However, the program compiles successfully in this scenario. It will return blank for all such values where the starting and ending indexes are the same. Be it (0,0) or (1,1) or (2,2) ...
HappyCoders
happycoders.eu › home › java › java substring() method: how to use it and how it works
Java substring() Method: How to Use It and How It Works
1 month ago - Experienced Java developers familiar with the use of the method can jump directly to the “How Does Substring Work in Java?” section. The String.substring() method returns a substring of the original string, based on a beginning index and an ending index. The best way to explain this is with an image. In the following example, we extract a substring from position 5 to 8 from the string “HappyCoders” (counting starts at 0):
DigitalOcean
digitalocean.com › community › tutorials › java-string-substring
Master Java Substring Method: Examples, Syntax, and Use Cases | DigitalOcean
February 20, 2025 - Learn how to use the Java substring method. Explore syntax, practical examples, and common errors to handle substrings effectively.
Programiz
programiz.com › java-programming › library › string › substring
Java String substring() | Programiz
January 31, 2024 - System.out.println(str1.substring(0, ... a substring from the given string. The substring begins with the character at the startIndex and extends to the character at index endIndex - 1 ·...
Tutorialspoint
tutorialspoint.com › java › lang › string_substring.htm
Java - String substring() Method
The Java String substring() method is used to retrieve a substring of a String object. The substring starts with the character at the given index and continues to the end of the current string.
TechVidvan
techvidvan.com › tutorials › java-string-substring
Java String substring() - TechVidvan
December 2, 2025 - A portion of a string is returned ... is inclusive, and endIndex is exclusive. For example, the initial index begins at 0 while the end index begins at 1....
How to do in Java
howtodoinjava.com › home › string › java string substring()
Java String substring() with Examples - HowToDoInJava
January 10, 2023 - Learn to get a substring from from given String in Java between the two indices. Note that String is character array based type and the first character of String is at 0 index.
Home and Learn
homeandlearn.co.uk › java › substring.html
java for complete beginners - substring
That's because the second number between the round brackets of substring doesn't mean how many characters you want to grab. It means the position in the string that you want to end at. By specifying 2 we're telling Java to end at the character in position 2 of the string. As you can't go from position 6 backwards to position 2 you get an error instead. (NOTE: If you start the count at 0 in the string "Bill", you might think that position 2 is the letter "l".
Baeldung
baeldung.com › home › java › java string › java string.substring()
Java.String.substring() | Baeldung
April 11, 2025 - @Test(expected = IndexOutOfBoundsException.class) public void whenSecondIndexEqualToLengthOfString_thenCorrect() { String s = "Welcome to Baeldung"; String sub = s.substring(0, 20); } Next »Java String.toLowerCase() « PreviousJava String.subSequence() Baeldung Pro – NPI EA (cat = Baeldung) Baeldung Pro comes with both absolutely No-Ads as well as finally with Dark Mode, for a clean learning experience: >> Explore a clean Baeldung ·
Simplilearn
simplilearn.com › home › resources › software development › all you should know about substring in java
All You Should Know About Substring in Java | Simplilearn
September 11, 2025 - 3. Deleting the first character : Strings in Java start at index 0, i.e., the first character is 0 indexed. If you need to remove the first character, use substring(1).
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CodeGym
codegym.cc › java blog › strings in java › substring in java
Java String substring()
July 23, 2024 - Java Substring in general is a contiguous sequence of characters inside the String. It could be a part of the String or the whole String as well. What is substring in Java? This language has a substring() method, or rather two methods, thanks to Java method overloading.