java: incompatible types: incompatible parameter types in lambda expression
If you are using a Functional Interface with a method that says 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));
}
}
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 Incompatible parameter types in lambda expression: wrong number of parameters: expected 2 but found 1](https://code2care.org/java/fix-java-incompatible-types-incompatible-parameter-types-in-lambda-expression-error/images/Incompatible parameter types in lambda expression: wrong number of parameters: expected 2 but found 1.png)
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Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.
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