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test/tools/javac/lambda/lambdaExpression/LambdaTest6.java@93012e2a5d1d (annotated)

test/tools/javac/lambda/lambdaExpression/LambdaTest6.java

Sat, 07 Nov 2020 10:30:02 +0800

author

aoqi

date

Sat, 07 Nov 2020 10:30:02 +0800

changeset 3938

93012e2a5d1d

parent 2525

2eb010b6cb22

permissions

-rw-r--r--

Added tag mips-jdk8u275-b01 for changeset eb6ee6a5f2fe

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*/
aoqi@0	23
aoqi@0	24	/**
aoqi@0	25	* @test
aoqi@0	26	* @bug 8003280
aoqi@0	27	* @summary Add lambda tests
aoqi@0	28	* Test bridge methods for certain SAM conversions
aoqi@0	29	* @compile LambdaTest6.java
aoqi@0	30	* @run main LambdaTest6
aoqi@0	31	*/
aoqi@0	32
aoqi@0	33	import java.lang.reflect.Method;
aoqi@0	34	import java.util.HashSet;
aoqi@0	35	import java.util.Set;
aoqi@0	36
aoqi@0	37	public class LambdaTest6<T> {
aoqi@0	38
aoqi@0	39	interface H {Object m();}
aoqi@0	40
aoqi@0	41	interface K<U> {void m(U element);}
aoqi@0	42
aoqi@0	43	interface L extends K<String> {} //generic substitution
aoqi@0	44
aoqi@0	45	interface M {void m(String s);}
aoqi@0	46
aoqi@0	47	interface KM extends K<String>, M{} //generic substitution
aoqi@0	48
aoqi@0	49	interface N extends H {String m();} //covariant return
aoqi@0	50
aoqi@0	51	private static void assertTrue(boolean b) {
aoqi@0	52	if(!b)
aoqi@0	53	throw new AssertionError();
aoqi@0	54	}
aoqi@0	55
aoqi@0	56	private Set<String> setOfStringObject() {
aoqi@0	57	Set<String> s = new HashSet<>();
aoqi@0	58	s.add("java.lang.String");
aoqi@0	59	s.add("java.lang.Object");
aoqi@0	60	return s;
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	private void test1()
aoqi@0	64	{
aoqi@0	65	L la = s -> { };
aoqi@0	66	la.m("hi");
aoqi@0	67	Class<? extends L> c1 = la.getClass();
aoqi@0	68	Method[] methods = c1.getDeclaredMethods();
aoqi@0	69	Set<String> types = setOfStringObject();
aoqi@0	70	for(Method m : methods) {
aoqi@0	71	assertTrue(m.getName().equals("m"));
aoqi@0	72	Class[] parameterTypes = m.getParameterTypes();
aoqi@0	73	assertTrue(parameterTypes.length == 1);
aoqi@0	74	assertTrue(types.remove(parameterTypes[0].getName()));
aoqi@0	75	}
aoqi@0	76	assertTrue(types.isEmpty() || (types.size() == 1 && types.contains("java.lang.String")));
aoqi@0	77	}
aoqi@0	78
aoqi@0	79	private void test2()
aoqi@0	80	{
aoqi@0	81	KM km = s -> { };
aoqi@0	82	//km.m("hi");
aoqi@0	83	Class<? extends KM> c2 = km.getClass();
aoqi@0	84	Method[] methods = c2.getDeclaredMethods();
aoqi@0	85	Set<String> types = setOfStringObject();
aoqi@0	86	for(Method m : methods) {
aoqi@0	87	assertTrue(m.getName().equals("m"));
aoqi@0	88	Class[] parameterTypes = m.getParameterTypes();
aoqi@0	89	assertTrue(parameterTypes.length == 1);
aoqi@0	90	assertTrue(types.remove(parameterTypes[0].getName()));
aoqi@0	91	}
aoqi@0	92	assertTrue(types.isEmpty());
aoqi@0	93	}
aoqi@0	94
aoqi@0	95	private void test3()
aoqi@0	96	{
aoqi@0	97	N na = ()-> "hi";
aoqi@0	98	assertTrue( na.m().equals("hi") );
aoqi@0	99	assertTrue( ((H)na).m().equals("hi") );
aoqi@0	100	Class<? extends N> c3 = na.getClass();
aoqi@0	101	Method[] methods = c3.getDeclaredMethods();
aoqi@0	102	Set<String> types = setOfStringObject();
aoqi@0	103	for(Method m : methods) {
aoqi@0	104	assertTrue(m.getName().equals("m"));
aoqi@0	105	Class returnType = m.getReturnType();
aoqi@0	106	assertTrue(types.remove(returnType.getName()));
aoqi@0	107	}
aoqi@0	108	assertTrue(types.size() == 1); //there's a bridge
aoqi@0	109	}
aoqi@0	110
aoqi@0	111
aoqi@0	112	public static void main(String[] args) {
aoqi@0	113	LambdaTest6 test = new LambdaTest6();
aoqi@0	114	test.test1();
aoqi@0	115	test.test2();
aoqi@0	116	test.test3();
aoqi@0	117	}
aoqi@0	118	}