Omitting Parameter Types

Description

We can choose to omit parameter types in lambda expressions.

In lambda expression (int x, int y) -> { return x + y; } the types of parameters are declared.

We can safely rewrite the lambda expression by omitting the types of parameters as

If we choose to omit the types of parameters, we have to omit types for all parameters.

Example

public class Main {
  public static void main(String[] argv) {
    Processor stringProcessor = (str) -> str.length();
    String name = "Java Lambda";
    int length = stringProcessor.getStringLength(name);
    System.out.println(length);//from w w  w  .  j  av  a  2s  .c  o m

  }
}

@FunctionalInterface
interface Processor {
  int getStringLength(String str);
}

The code above generates the following result.