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Strings are basically defined as an array of characters. In Java, objects of a String are immutable which means that a constant cannot be changed once created. Finding the substring of a string is a very common question asked in the Java interviews. So, I’ll explain how Substring in Java works.
These are the topics that I’ll be covering in this article:
Let’s get started.
A part of a string is called a Substring. In other words, substring is a subset of another string. The Java substring() method returns a new string that is a substring of this string. substring() method is an overloaded method.
Syntax:
substring(//any one of the methods)
{
//body
}
Example:
This is a clear example of a substring in Java. Here, the string is “Edureka” but when you break it down into blocks, it’s composed of substrings which finally compute the string.
Let’s move ahead and understand the different methods under substring().
There are basically two different methods under the substring() method. They are:
Let’s understand them in detail.
This method has two variants and it returns a new string that is a substring of this string. The substring begins with a character at the specified index ‘beginIndex’ to the end of the string.
Syntax:
public String substring(int begIndex)
Note: the index starts from ‘0’ which refer to the first character of String.
Let’s take a look at an example.
public class Substring { public static void main(String args[]) { // Initializing String String Str = new String("Welcome to Edureka"); // using substring() to extract substring // returns Edureka System.out.print("The substring is : "); System.out.println(Str.substring(10)); } }
This method has two variants and it returns a new string which is a substring of this string. The substring begins with a character at the specified index BeginIndex and extends to the end of the string or up to endIndex – 1 if another argument is present.
Syntax
public String substring(int begIndex, int endIndex)
Let’s work with an example.
public class Substring2 { public static void main(String args[]) { // Initializing String String Str = new String("Welcome to Edureka"); // using substring() to extract substring // returns edu System.out.print("The substring is : "); System.out.println(Str.substring(10, 14)); } }
Output: edu
Now, let’s move ahead to the final topic.
Let’s discuss a few programs that help in understanding Substring in Java.
class Course{ // Function to print all sub strings static void subString(char str[], int n) { // Pick starting point for (int len = 1; len <= n; len++) { // Pick ending point for (int i = 0; i <= n - len; i++) { // Print characters from current starting point to current ending point. int j = i + len - 1; for (int k = i; k <= j; k++) { System.out.print(str[k]); } System.out.println(); } } } // Driver program to test the above function public static void main(String[] args) { char str[] = {'a', 'b', 'c'}; subString(str, str.length); } }
Output:
Next, using a Method (Using substr() function)
public class Substring { // Function to print all substring public static void SubString(String str, int n) { for (int i = 0; i < n; i++) for (int j = i+1; j <= n; j++) System.out.println(str.substring(i, j)); } public static void main(String[] args) { String str = "abcd"; SubString(str, str.length()); } }
Output:
This brings us to the end of this article where we have learned about Substring in Java. Hope you are clear with all that has been shared with you in this tutorial.
Make sure you practice as much as possible and revert your experience.
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