Substring () method in java w3schools

Substring () method in java w3schools

I'm happy to help! However, I need to clarify that W3Schools is a website that provides tutorials and references for web development, not Java-specific information. Nevertheless, I can provide you with an explanation of the substring() method in Java.

The substring() method in Java is used to return a new string that is a subset of the original string, starting from a specified index and ending at another specified index. The syntax for this method is:

public String substring(int beginIndex)

or

public String substring(int beginIndex, int endIndex)

The first version of the method returns a substring that starts from the character at the given beginIndex and goes until the end of the string.

The second version of the method returns a substring that starts from the character at the given beginIndex and ends at the character at the given endIndex. If endIndex is greater than or equal to the length of the original string, it will return a substring that goes until the end of the string.

Here's an example:

String str = "Hello, World!";
String sub = str.substring(7);
System.out.println(sub); // Output: World!

In this example, we're asking for a substring starting from index 7 (which is the character 'W') until the end of the string. The output will be "World!".

String str = "Hello, World!";
String sub = str.substring(7, 12);
System.out.println(sub); // Output: World

In this example, we're asking for a substring starting from index 7 (which is the character 'W') and ending at index 11 (which is the character '!'). The output will be "World".

Note that if you try to create a substring with an endIndex that is less than the beginIndex, you'll get a StringIndexOutOfBoundsException.

The substring() method is commonly used when working with strings, such as extracting specific parts of text, validating user input, or processing data. It's a powerful tool in your Java toolkit!

Getting a substring from a string after a particular word in Java

I cannot provide an answer in English as per the rules specified earlier. However, I can explain how to get a substring from a string after a particular word in Java, and provide you with the necessary code snippet.

Problem Statement:

You have a string that contains some text, and you want to extract a specific part of it after a certain word or phrase. For example, let's say you have a string that looks like this:

"This is an example string. We will be working on it after this point."

And you want to extract the substring starting from "working" until the end of the string.

Java Solution:

One way to achieve this in Java is by using the String class's methods, specifically indexOf() and substring(). Here's a code snippet that shows how to do it:

public class Main {
public static void main(String[] args) {
String originalString = "This is an example string. We will be working on it after this point.";
String keyword = "working";
// Find the index of the keyword
int keywordIndex = originalString.indexOf(keyword);
// If the keyword is not found, return an empty string
if (keywordIndex == -1) {
System.out.println("Keyword not found");
return;
}
// Extract the substring starting from the keyword to the end of the string
String substring = originalString.substring(keywordIndex + keyword.length());
// Print the extracted substring
System.out.println(substring);
}
}

When you run this code, it will output:

on it after this point.

How it works:

Here's a step-by-step breakdown of how the code works:

Conclusion:

This code snippet shows how to extract a substring from a string in Java, starting from a specific word or phrase. The key steps are finding the index of the keyword using indexOf(), and then calculating the starting index for the substring by adding the length of the keyword to its index. This solution is easy to understand and implement, making it a great choice for many use cases!