Mercurial > jdk8-mips64-public > langtools / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/test/tools/javac/lambda/MethodReference01.java	Wed Apr 27 01:34:52 2016 +0800
     1.3 @@ -0,0 +1,92 @@
     1.4 +/*
     1.5 + * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
     1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     1.7 + *
     1.8 + * This code is free software; you can redistribute it and/or modify it
     1.9 + * under the terms of the GNU General Public License version 2 only, as
    1.10 + * published by the Free Software Foundation.
    1.11 + *
    1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
    1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    1.14 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    1.15 + * version 2 for more details (a copy is included in the LICENSE file that
    1.16 + * accompanied this code).
    1.17 + *
    1.18 + * You should have received a copy of the GNU General Public License version
    1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
    1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    1.21 + *
    1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    1.23 + * or visit www.oracle.com if you need additional information or have any
    1.24 + * questions.
    1.25 + */
    1.26 +
    1.27 +/*
    1.28 + * @test
    1.29 + * @bug 8003280
    1.30 + * @summary Add lambda tests
    1.31 + *  use method reference to sort list elements by field
    1.32 + * @author  Brian Goetz
    1.33 + * @author  Maurizio Cimadamore
    1.34 + * @run main MethodReference01
    1.35 + */
    1.36 +
    1.37 +import java.util.*;
    1.38 +
    1.39 +public class MethodReference01 {
    1.40 +
    1.41 +    interface Getter<U, T> {
    1.42 +        public U get(T t);
    1.43 +    }
    1.44 +
    1.45 +    static class Foo {
    1.46 +        private Integer a;
    1.47 +        private String b;
    1.48 +
    1.49 +        Foo(Integer a, String b) {
    1.50 +            this.a = a;
    1.51 +            this.b = b;
    1.52 +        }
    1.53 +
    1.54 +        static Integer getA(Foo f) { return f.a; }
    1.55 +        static String getB(Foo f) { return f.b; }
    1.56 +    }
    1.57 +
    1.58 +    public static <T, U extends Comparable<? super U>>
    1.59 +           void sortBy(List<T> s, final Getter<U, T> getter) {
    1.60 +        Collections.sort(s, new Comparator<T>() {
    1.61 +            public int compare(T t1, T t2) {
    1.62 +                return getter.get(t1).compareTo(getter.get(t2));
    1.63 +            }
    1.64 +        });
    1.65 +    };
    1.66 +
    1.67 +    public static void main(String[] args) {
    1.68 +        List<Foo> c = new ArrayList<Foo>();
    1.69 +        c.add(new Foo(2, "Hello3!"));
    1.70 +        c.add(new Foo(3, "Hello1!"));
    1.71 +        c.add(new Foo(1, "Hello2!"));
    1.72 +        checkSortByA(c);
    1.73 +        checkSortByB(c);
    1.74 +    }
    1.75 +
    1.76 +    static void checkSortByA(List<Foo> l) {
    1.77 +        sortBy(l, Foo::getA);
    1.78 +        int oldA = -1;
    1.79 +        for (Foo foo : l) {
    1.80 +            if (foo.a.compareTo(oldA) < 1) {
    1.81 +                throw new AssertionError();
    1.82 +            }
    1.83 +        }
    1.84 +    }
    1.85 +
    1.86 +    static void checkSortByB(List<Foo> l) {
    1.87 +        sortBy(l, Foo::getB);
    1.88 +        String oldB = "";
    1.89 +        for (Foo foo : l) {
    1.90 +            if (foo.b.compareTo(oldB) < 1) {
    1.91 +                throw new AssertionError();
    1.92 +            }
    1.93 +        }
    1.94 +    }
    1.95 +}