OnJava8-Examples/functional/Closure3.java

// functional/Closure3.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// {WillNotCompile}
import java.util.function.*;

public class Closure3 {
  IntSupplier makeFun(int x) {
    int i = 0;
    // Neither x++ nor i++ will work:
    return () -> x++ + i++;
  }
}