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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int c = 0;
		Incrementer f = (int a) -> {
			c += a;
			return c;
		};
		System.out.println(f.inc(1));
		System.out.println(f.inc(1));
	}
 
 
	interface Incrementer {
		int inc(int a);
	}
}

Main.java:14: error: local variables referenced from a lambda expression must be final or effectively final
			c += a;
			^
Main.java:15: error: local variables referenced from a lambda expression must be final or effectively final
			return c;
			       ^
2 errors

Standard output is empty