java: incompatible types: incompatible parameter types in lambda expression
If you are using a Functional Interface with a method that say takes in to two arguments and when implementing the method using Lambda expression you pass in not two you will get this error. Let's see an example
Example: Functional Interfacepackage org.code2care;
@FunctionalInterface
public interface Calculate {
public int sum(int number1,int number2);
}
Lambda Expression:
package org.code2care;
public class Example {
public static void main(String[] args) {
Calculate calculate = (n1) -> n1; //Compilation error
System.out.println(calculate.sum(10,20));
}
}
❗️Incompatible parameter types in lambda expression: wrong number of parameters: expected 2 but found 1
So the fix to incompatible parameter types in lambda expression is to make sure that you pass in the correct parameters and types when trying to define a lambda expression.
public static void main(String[] args) {
Calculate calculate = (n1,n2) -> n1+n2; //fix
System.out.println(calculate.sum(10,20));
}

Incompatible parameter types in lambda expression: wrong number of parameters: expected 2 but found 1
More Posts related to Java,
- Add two numbers using Java Generics
- Convert Java List to Json String using Jackson
- Convert Java Object to JSON using Jackson Library
- Java SE JDBC: Insert with PreparedStatement Example
- [Program] How to read three different values using Scanner in Java
- Java JDBC Batch Update Example with PreparedStatement
- Java Stream flatmap() Examples
- Save Java Object as JSON file using Jackson Library
- Java get day of the week as an int using DayOfWeek
- Create Nested Directories using Java Code
- Java JDBC Delete a Record in Database Table using PreparedStatement
- List of jars required for Struts2 project
- Convert Java Object to XML using Jackson Library
- Struts2 : java.lang.ClassNotFoundException: org.apache.commons.fileupload.RequestContext
- Java JDBC Get Id of the Inserted Record with AutoIncrement
- How to list all tables using Java JDBC
- Java Jackson ObjectMapper Class with Examples
- Fix: Maven - Failed to execute goal - Compilation failure - Source/Target option 5 is no longer supported. Use 7 or later
- Eclipse : The type java.lang.CharSequence cannot be resolved. Indirectly referenced from required .class files
- Formatting Double in Java [Examples]
- How to run Java Unit Test cases with Apache Maven?
- [fix] NullPointerException Cannot Invoke findById because Repository is null - Java Spring
- [Fix] java: integer number too large compilation error
- [Java] Read a File with UTF-8 Encoding
- How to detect Operating System using Java code
More Posts:
- Add Bookmark macOS Safari - MacOS
- No connection available Use Connect-SPOService before running this CmdLet - SharePoint
- Command to display epoch time Terminal - Linux
- How to change default browser on Mac Monterey - MacOS
- Github: fatal: Authentication failed Support for password was removed on August 13, 2021 - Git
- #HappyBirthdayJimin hashtag trending on BTS Jimin 25th birthday [BTS ARMY] - BTS
- How to empty Trash in macOS? - MacOS
- [Solution] Notepad++ Compare option unavailable - NotepadPlusPlus