8003280: Add lambda tests

Turn on lambda expression, method reference and default method support

Reviewed-by: jjg

langtools/test/tools/javac/lambda/methodReference/MethodRef5.java

@@ -0,0 +1,96 @@
+/*
+ * 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 method reference with SAM interface Comparator<T>
+ * @compile MethodRef5.java
+ * @run main MethodRef5
+ */
+
+import java.util.Collections;
+import java.util.List;
+import java.util.ArrayList;
+
+public class MethodRef5 {
+
+    static class Person {
+
+        private String firstName;
+        private String lastName;
+        private int age;
+
+        public Person() { }
+
+        public Person(String fn, String ln, int a) {
+            firstName = fn;
+            lastName = ln;
+            age = a;
+        }
+
+        public String getLastName() {
+            return lastName;
+        }
+
+        public int getAge() {
+            return age;
+        }
+
+        //the following 2 methods are signature-compatible with Comparator<Person>.compare():
+        public static int compareByAge(Person a, Person b) {
+            return a.age - b.age;
+        }
+
+        public int compareByLastName(Person a, Person b) {
+            return a.lastName.compareToIgnoreCase(b.lastName);
+        }
+    }
+
+    private static void assertTrue(boolean cond) {
+        if (!cond)
+            throw new AssertionError();
+    }
+
+    public static void main(String[] args) {
+
+        List<Person> persons = new ArrayList<Person>();
+        persons.add(new Person("John", "Smith", 49));
+        persons.add(new Person("Abraham", "Lincoln", 30));
+        persons.add(new Person("George", "Washington", 29));
+        persons.add(new Person("Peter", "Derby", 50));
+        Collections.sort(persons, Person::compareByAge);//static method reference to compareByAge(Person, Person)
+        String age = "";
+        for (Person p : persons) {
+            age += p.getAge() + " ";
+        }
+        assertTrue( (age.equals("29 30 49 50 ")) );
+        Collections.sort(persons, new Person()::compareByLastName);//instance method reference to compareByLastName(Person, Person)
+        String lastName = "";
+        for (Person p : persons) {
+            lastName += p.getLastName() + " ";
+        }
+        assertTrue( lastName.equals("Derby Lincoln Smith Washington ") );
+    }
+}