Explore common scenarios of removing whitespace from a String in Java
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Baeldung Author
Kai Yuan
Kai Yuan has been developing software for more than 20 years, mainly working on enterprise Kotlin and Java applications. He’s been using Linux for over 20 years and is a big fan of the Vim editor. Kai also enjoys helping out on StackOverflow and currently lives in Hamburg.
Here's what I've written (so far):
Baeldung on Java
- All
- Java String (43)
- Core Java (28)
- Java List (26)
- Java Array (18)
- Java Numbers (16)
- Java Map (16)
- Java IO (15)
- Algorithms (9)
- Java Streams (8)
- Testing (7)
- Persistence (5)
- Maven (4)
- Java Collections (4)
- Spring Boot (3)
- Spring Persistence (2)
- Java Concurrency (2)
- XML (1)
- Spring Data (1)
- Networking (1)
- Java Web (1)
- Java Dates (1)
- Java (1)
- Jakarta EE (1)
- Jackson (1)
- JPA (1)
- IDE (1)
Get the Full Path of a JAR File From a Class
Filed under Core Java
Explore how to find the JAR file and its full path from a given class
Check if at Least Two Out of Three Booleans Are True in Java
Filed under Core Java
Explore a few different approaches to check if there are at least two trues in three given booleans
Check if BigDecimal Value Is Zero
Filed under Java Numbers
Explore how to check if a BigDecimal object’s value is zero and learn a common pitfall
Reverse an ArrayList in Java
Filed under Java List
Learn how to reverse an ArrayList through examples
Working With a List of Lists in Java
Filed under Java List
Take a closer look at the Java List of Lists data structure and explore some everyday operations
Convert Byte Size Into a Human-Readable Format in Java
Filed under Java IO
Explore how to convert file size in bytes into a human-readable format in Java
Java Error “bad operand types for binary operator”
Filed under Core Java
Learn why we may encounter the Java compile-time error “bad operand types for binary operator” and how to resolve the problem
Find the Difference Between Two Sets
Filed under Java Collections
Learn how to find the asymmetric and symmetric differences between two Set objects through examples
Baeldung on Linux
- All
- Scripting (36)
- Files (32)
- File Editing (21)
- Text Processing (11)
- File Searching (11)
- Processes (10)
- Administration (10)
- Filesystems (6)
- File Viewing (6)
- User Administration (4)
- Search (3)
- File Permissions (3)
- Web (2)
- Security (1)
- File Compression (1)
- Boot Process (1)
How to Limit grep Context to “n” Characters in a Line
Filed under File Searching
Learn how to limit the grep output characters displayed before and after the match.
Guide to Linux dirname Command with Examples
Learn how to use the dirname command in Linux to extract the directory part of a given path.
Guide to Linux basename Command with Examples
Learn about how to use the basename command to determine the file or folder name for one or more paths.
Printing Quote Characters in AWK
Filed under Text Processing
Learn how to print single or double quote characters in AWK scripts.
How to Read the First and the Last Line From Input
Filed under File Viewing
Learn how to extract the first and last lines from an input file using a single command.
Printing Specified Lines From a File
Filed under File Viewing
Learn how to extract specific lines from a file by line numbers using sed and awk.
Replace the First n Matched Instances in a File
Filed under File Editing
Learn how to replace the first n pattern occurrences in a file using sed and awk.
How to Operate on Files Listed in a File
Learn to use various techniques to operate on files listed in a file.
What’s the Meaning of $! in Bash Scripting
Learn the meaning of the special shell variable $!.
Baeldung on Kotlin
- All
- Kotlin Collections (18)
- Kotlin Classes and Objects (10)
- Kotlin Basics (10)
- Kotlin Numbers (9)
- Kotlin Strings (7)
- Kotlin Functions (5)
- Kotlin (4)
- Kotlin Arrays (3)
- Testing (2)
- Functional Programming (2)
- Spring (1)
- Security (1)
- Libraries (1)
- Algorithms (1)
Resolving Compile Error: “Const ‘val’ is only allowed on top level, in named objects, or in companion objects” in Kotlin
Filed under Kotlin Classes and Objects
Learn where and how you can use const val in Kotlin.
Resolving “Type Mismatch Inferred Type is Unit But Void Was Expected” in Kotlin
Filed under Kotlin Functions
Learn how to solve the “Unit but Void was expected” compilation error in Kotlin.
Iterating Enum Entries in Kotlin
Filed under Kotlin Basics
Learn how to loop over the entries of an Enum in Kotlin.
Difference Between clearAllMocks() and unmockkAll() in MockK
Filed under Testing
Learn about the difference between clearAllMocks() and unmockkAll() in MockK and when to use each one.
Serialize Enum Property to JSON in Kotlin
Filed under Libraries
Learn how to serialize a Kotlin enum property to JSON using Kotlin libraries.
Finding First Match in Nested Lists in Kotlin
Filed under Algorithms, Kotlin Collections
Learn how to search through a list of lists in Kotlin to find the first matching element.
Conditional Exception Throwing in Kotlin
Filed under Kotlin
Learn different approaches to throwing an exception when a condition is true in Kotlin.
Pass a Function as Parameter to Another in Kotlin
Filed under Kotlin Functions
Learn about how functions can be passed as parameters to other functions in Kotlin.
Matching Varargs Using MockK in Kotlin
Filed under Testing
Learn how to use the MockK mocking library to match varargs arguments in Kotlin.
Baeldung on Ops
- All
- Git (5)
Remove File From Git Repository Without Deleting It Locally
Filed under Git
Learn how to remove a file or directory from a Git repository but keep its local copy
How to Get the Current Branch Name in Git
Filed under Git
Learn how to get the Git branch name we’re currently working on
Delete a Git Branch Locally and Remotely
Filed under Git
Learn how to delete Git branches
Move Existing, Uncommitted Work to a New Branch in Git
Filed under Git
Learn a couple of quick ways to move uncommitted changes to a new Git branch
Squash the Last X Commits Using Git
Filed under Git
Learn what Git squashing is, talk about when we need to squash commits, and take a closer look at how to squash commits