Detailed explanation of usage examples of java trim
The rim method is generally used to remove spaces, but according to the JDK API description, this method is not just about removing spaces, it can remove all characters from encoding '\u0000' to '\u0020'.
Carriage return and line feed are also among these 20 characters. The following is an example:
public
class
String
Test {
public
static
void main(String[] args) {
char[] chars = {'a','b','c','\r','\n'};
System.out.
print
ln(chars.length);
String str =
new
String(chars);
System.out.println(str.length());
String newStr = str.
trim
();
System.out.println(newStr.length());
}
}The output is as follows:
5
5
3
As can be seen from the output, the trimI() method also removes the two characters \r\n.
The following is the API description of the trim() method:
public String trim()
Returns a copy of the string, ignoring leading and trailing whitespace.
If this String object represents an empty character sequence, or the codes of the first and last characters of the character sequence represented by this String object are both greater than '\u0020' (space character), return this String A reference to the object.
Otherwise, if there is no character in the string with a code greater than ‘\u0020′, a new String object representing an empty string is created and returned.
Otherwise, assume k is the index of the first character with code greater than ‘\u0020′, and m is the index of the last character with code greater than ‘\u0020′. Creates a new String object that represents the substring of this string starting with the character at index k and ending with the character at index m, which is the result of this.substring(k, m+1).
This method is used to truncate whitespace from beginning to end of the string (as defined above).
Returns:
A copy of this string with leading and trailing whitespace removed, or a copy of this string if there are no leading and trailing whitespace.
The details of characters that can be removed by the trim() method can be output through the following function:
public class StringTest {
public static void main(String[] args) {
char[] chars = new char[20];
chars[0] = '\u0000';
chars[1] = '\u0001';
chars[2] = '\u0002';
chars[3] = '\u0003';
chars[4] = '\u0004';
chars[5] = '\u0005';
chars[6] = '\u0006';
chars[7] = '\u0007';
chars[8] = '\u0008';
chars[9] = '\u0009';
chars[10] = '\u0010';
chars[11] = '\u0012';
chars[12] = '\u0013';
chars[13] = '\u0014';
chars[14] = '\u0015';
chars[15] = '\u0016';
chars[16] = '\u0017';
chars[17] = '\u0018';
chars[18] = '\u0019';
chars[19] = '\u0020';
for
(int i = 0; i < chars.length; i++) {
System.out.print("(" + i + ")" + chars[i] + " ");
if
(i != 0 && i % 5 == 0) {
System.out.println();
}
}
}
}The output is as follows:
[Related recommendations]
1. Share examples of TrimHelper method in Java
2. Detailed explanation of String.trim() method examples in Java
3. How to remove spaces on both sides of a string using trim() in js
5. The PHP function trim() to remove leading and trailing spaces and special characters from a string
The above is the detailed content of Detailed explanation of usage examples of java trim. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Java Spring Interview Questions
Aug 30, 2024 pm 04:29 PM
In this article, we have kept the most asked Java Spring Interview Questions with their detailed answers. So that you can crack the interview.
Break or return from Java 8 stream forEach?
Feb 07, 2025 pm 12:09 PM
Java 8 introduces the Stream API, providing a powerful and expressive way to process data collections. However, a common question when using Stream is: How to break or return from a forEach operation? Traditional loops allow for early interruption or return, but Stream's forEach method does not directly support this method. This article will explain the reasons and explore alternative methods for implementing premature termination in Stream processing systems. Further reading: Java Stream API improvements Understand Stream forEach The forEach method is a terminal operation that performs one operation on each element in the Stream. Its design intention is
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
Java Program to Find the Volume of Capsule
Feb 07, 2025 am 11:37 AM
Capsules are three-dimensional geometric figures, composed of a cylinder and a hemisphere at both ends. The volume of the capsule can be calculated by adding the volume of the cylinder and the volume of the hemisphere at both ends. This tutorial will discuss how to calculate the volume of a given capsule in Java using different methods. Capsule volume formula The formula for capsule volume is as follows: Capsule volume = Cylindrical volume Volume Two hemisphere volume in, r: The radius of the hemisphere. h: The height of the cylinder (excluding the hemisphere). Example 1 enter Radius = 5 units Height = 10 units Output Volume = 1570.8 cubic units explain Calculate volume using formula: Volume = π × r2 × h (4
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP vs. Python: Core Features and Functionality
Apr 13, 2025 am 12:16 AM
PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.
Create the Future: Java Programming for Absolute Beginners
Oct 13, 2024 pm 01:32 PM
Java is a popular programming language that can be learned by both beginners and experienced developers. This tutorial starts with basic concepts and progresses through advanced topics. After installing the Java Development Kit, you can practice programming by creating a simple "Hello, World!" program. After you understand the code, use the command prompt to compile and run the program, and "Hello, World!" will be output on the console. Learning Java starts your programming journey, and as your mastery deepens, you can create more complex applications.
