8003280: Add lambda tests

Turn on lambda expression, method reference and default method support

Reviewed-by: jjg

langtools/test/tools/javac/lambda/lambdaExpression/SamConversion.java

@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug 8003280
+ * @summary Add lambda tests
+ *   Test SAM conversion of lambda expressions in context of assignment, method call, return statement and cast.
+ * @compile SamConversion.java
+ * @run main SamConversion
+ */
+
+public class SamConversion {
+
+    static interface Foo {
+        Integer m(int i);
+    }
+
+    static interface Bar {
+        int m(Integer i) throws Exception;
+    }
+
+    private static String assertionStr = "";
+
+    private static void assertTrue(boolean b) {
+        if(!b)
+            throw new AssertionError();
+    }
+
+    private static void test1(Foo foo) {
+        assertTrue(foo.m(1) == 2);
+    }
+
+    private static void test2(Bar bar) {
+        try {
+            assertTrue(bar.m(1) == 2);
+        } catch (Exception e){
+            assertTrue(false);
+        }
+    }
+
+    private static Bar test3(int i) {
+        switch (i) {
+        case 0:
+            return n -> n + 1;
+        case 1:
+            return (Integer n) -> 2 * n;
+        case 2:
+            return (Integer n) -> {return new Integer(n-1);};
+        case 3:
+            return n -> {throw new Exception();};
+        default:
+            return null;
+        }
+    }
+
+    public static void main(String[] args) {
+
+        //assign:
+        Foo foo = (int n) -> n + 1; //explicit type and boxing
+        assertTrue(foo.m(1) == 2);
+
+        foo = n -> n + 1; //type inferrred and boxing
+        assertTrue(foo.m(1) == 2);
+
+        Bar bar = (Integer n) -> n + 1; //explicit type and unboxing
+        try {
+            assertTrue(bar.m(1) == 2);
+        } catch (Exception e) {
+            assertTrue(false);
+        }
+
+        bar = (Integer n) -> new Integer(n+1); //explicit type and unboxing twice
+        try {
+            assertTrue(bar.m(1) == 2);
+        } catch (Exception e) {
+            assertTrue(false);
+        }
+
+        bar = n -> n.intValue() + 1; //type inferred
+        try {
+            assertTrue(bar.m(1) == 2);
+        } catch (Exception e) {
+            assertTrue(false);
+        }
+
+        bar = n -> n + 1; // type inferred and unboxing
+        try {
+            assertTrue(bar.m(1) == 2);
+        } catch (Exception e) {
+            assertTrue(false);
+        }
+
+        //cast:
+        assertTrue(((Foo)n -> {return n+1;}).m(1) == 2); //statement (instead of expression) in lambda body
+        try {
+            assertTrue(((Bar)n -> {return n+1;}).m(1) == 2); //statement in lambda body
+        } catch (Exception e) {
+            assertTrue(false);
+        }
+
+        //method parameter:
+        test1((int n) -> new Integer(n+1)); //explicit type
+        test2((Integer n) -> n.intValue() + 1); //explicit type
+
+        //return statement:
+        bar = test3(0);
+        try {
+            assertTrue(bar.m(1) == 2);
+        } catch (Exception e) {
+            assertTrue(false);
+        }
+        bar = test3(1);
+        try {
+            assertTrue(bar.m(3) == 6);
+        } catch (Exception e) {
+            assertTrue(false);
+        }
+        bar = test3(2);
+        try {
+            assertTrue(bar.m(10) == 9);
+        } catch (Exception e) {
+            assertTrue(false);
+        }
+        bar = test3(3);
+        try {
+            bar.m(10);
+            assertTrue(false);
+        } catch (Exception e) {}
+    }
+}