example of using lambda functions with a class

.gitignore

@@ -5,4 +5,5 @@
 *.aux
 *.bbl
 *.blg
-*DS_STORE*
+*DS_Store*
+*.csv

src/sandbox/BinaryIntExpression.java

+package sandbox;
+
+public interface BinaryIntExpression{
+	public int eval(int a1, int a2);
+}
\ No newline at end of file

src/sandbox/TestLambdas.java

+package sandbox;
+
+public class TestLambdas {
+	public static void main(String[] args) {
+		BinaryIntExpression b0;
+		BinaryIntExpression b1;
+		BinaryIntExpression b2;
+		BinaryIntExpression b3;
+		BinaryIntExpression b4;
+		int result;
+		
+		b0 = (a1, a2) -> a1 + a2;
+		b1 = (a1, a2) -> a1 - a2;
+		b2 = (a1, a2) -> a1 * a2;
+		b3 = (a1, a2) -> a1 / a2;
+		b4 = (a1, a2) -> {
+			int n = a1 * a2;
+			n = n * a1 + a2;
+			return n;
+		};
+			
+		result = binaryOperation(1,2,b0);
+		System.out.println(result);
+		
+		result = binaryOperation(1,2,b1);
+		System.out.println(result);
+		
+		result = binaryOperation(1,2,b2);
+		System.out.println(result);
+		
+		result = binaryOperation(1,2,b3);
+		System.out.println(result);
+		
+		result = binaryOperation(1,2,b4);
+		System.out.println(result);
+	}
+	
+	public static int binaryOperation(int a1, int a2, BinaryIntExpression exp) {
+		return exp.eval(a1, a2);
+	}
+	
+}