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

 /*

  * 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

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  */

 import java.util.List;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.io.Serializable;

 import java.io.File;

 /**

  * @test

  * @bug 8003280

  * @summary Add lambda tests

  *   Parameter types inferred from target type in generics without wildcard

  * @compile InferenceTest2.java

  * @run main InferenceTest2

  */

 public class InferenceTest2 {

     private static void assertTrue(boolean cond) {

         if (!cond)

             throw new AssertionError();

     }

     public static void main(String[] args) {

         InferenceTest2 test = new InferenceTest2();

         //test SAM1<T>

         SAM1<String> sam1 = para -> { String result = "";

                                       for(String s : para)

                                           if(s.compareTo(result) > 0)

                                               result = s;

                                       return result; };

         List<String> list = Arrays.asList("a", "b", "c");

         assertTrue(sam1.m1(list).equals("c"));

         test.method1(para -> para.get(0));

         //test SAM2<T>

         SAM2<String> sam2 = para -> {para = para.substring(0);};

         SAM2<Double> sam2_2 = para -> {};

         SAM2<File> sam2_3 = para -> { if(para.isDirectory())

                                           System.out.println("directory");

                                     };

         //test SAM3<T>

         SAM3<String> sam3 = para -> para[0].substring(0, para[0].length()-1);

         assertTrue(sam3.m3("hello+").equals("hello"));

         SAM3<Integer> sam3_2 = para -> para[0] - para[1];

         assertTrue(sam3_2.m3(1, -1) == 2);

         SAM3<Double> sam3_3 = para -> para[0] + para[1] + para[2] + para[3];

         assertTrue(sam3_3.m3(1.0, 2.0, 3.0, 4.0) == 10.0);

         test.method3(para -> para[0] + 1);

         //test SAM6<T>

         SAM6<String> sam6 = (para1, para2) -> para1.concat(para2);

         assertTrue(sam6.m6("hello", "world").equals("helloworld"));

         test.method6((para1, para2) -> para1 >= para2? para1 : para2);

     }

     void method1(SAM1<Integer> sam1) {

         List<Integer> list = Arrays.asList(3,2,1);

         assertTrue(sam1.m1(list) == 3);

     }

     void method3(SAM3<Double> sam3) {

         assertTrue(sam3.m3(2.5) == 3.5);

     }

     void method6(SAM6<Long> sam6) {

         assertTrue(sam6.m6(5L, -5L) == 5);

     }

     interface SAM1<T> {

         T m1(List<T> x);

     }

     interface SAM2<T extends Serializable> {

         void m2(T x);

     }

     interface SAM3<T> {

         T m3(T... x);

     }

     interface SAM6<T> {

         T m6(T a, T b);

     }

 }