8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

test/langtools/tools/javac/lambda/MethodReference01.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2010, 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
+ *  use method reference to sort list elements by field
+ * @author  Brian Goetz
+ * @author  Maurizio Cimadamore
+ * @run main MethodReference01
+ */
+
+import java.util.*;
+
+public class MethodReference01 {
+
+    interface Getter<U, T> {
+        public U get(T t);
+    }
+
+    static class Foo {
+        private Integer a;
+        private String b;
+
+        Foo(Integer a, String b) {
+            this.a = a;
+            this.b = b;
+        }
+
+        static Integer getA(Foo f) { return f.a; }
+        static String getB(Foo f) { return f.b; }
+    }
+
+    public static <T, U extends Comparable<? super U>>
+           void sortBy(List<T> s, final Getter<U, T> getter) {
+        Collections.sort(s, new Comparator<T>() {
+            public int compare(T t1, T t2) {
+                return getter.get(t1).compareTo(getter.get(t2));
+            }
+        });
+    };
+
+    public static void main(String[] args) {
+        List<Foo> c = new ArrayList<Foo>();
+        c.add(new Foo(2, "Hello3!"));
+        c.add(new Foo(3, "Hello1!"));
+        c.add(new Foo(1, "Hello2!"));
+        checkSortByA(c);
+        checkSortByB(c);
+    }
+
+    static void checkSortByA(List<Foo> l) {
+        sortBy(l, Foo::getA);
+        int oldA = -1;
+        for (Foo foo : l) {
+            if (foo.a.compareTo(oldA) < 1) {
+                throw new AssertionError();
+            }
+        }
+    }
+
+    static void checkSortByB(List<Foo> l) {
+        sortBy(l, Foo::getB);
+        String oldB = "";
+        for (Foo foo : l) {
+            if (foo.b.compareTo(oldB) < 1) {
+                throw new AssertionError();
+            }
+        }
+    }
+}