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test/tools/javac/lambda/lambdaExpression/LambdaTest1.java@959103a6100f (annotated)

test/tools/javac/lambda/lambdaExpression/LambdaTest1.java

Wed, 27 Apr 2016 01:34:52 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:34:52 +0800

changeset 0

959103a6100f

child 2525

2eb010b6cb22

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/langtools/
changeset: 2573:53ca196be1ae
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2011, 2014, 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 lambda expressions for existing SAM interfaces like Runnable and Comparator<T>
aoqi@0	29	* @compile LambdaTest1.java
aoqi@0	30	* @run main LambdaTest1
aoqi@0	31	*/
aoqi@0	32
aoqi@0	33	import java.util.Collections;
aoqi@0	34	import java.util.List;
aoqi@0	35	import java.util.ArrayList;
aoqi@0	36
aoqi@0	37	public class LambdaTest1 {
aoqi@0	38
aoqi@0	39	private static String assertionStr = "";
aoqi@0	40
aoqi@0	41	private static void assertTrue(boolean b) {
aoqi@0	42	if(!b)
aoqi@0	43	throw new AssertionError();
aoqi@0	44	}
aoqi@0	45
aoqi@0	46	private static void test1(Runnable r) {
aoqi@0	47	r.run();
aoqi@0	48	}
aoqi@0	49
aoqi@0	50	void test2(Object o) {
aoqi@0	51	if(o instanceof Runnable)
aoqi@0	52	((Runnable)o).run();
aoqi@0	53	}
aoqi@0	54
aoqi@0	55	Runnable test3() {
aoqi@0	56	return ()-> { assertionStr += "Runnable6"; };
aoqi@0	57	}
aoqi@0	58
aoqi@0	59	public static void main(String[] args) {
aoqi@0	60
aoqi@0	61	//lambda expressions for SAM interface Runnable:
aoqi@0	62	//assign:
aoqi@0	63	Runnable r = ()-> { assertionStr += "Runnable1 "; };
aoqi@0	64	r.run();
aoqi@0	65
aoqi@0	66	//cast:
aoqi@0	67	((Runnable)()-> { assertionStr += "Runnable2 "; }).run();
aoqi@0	68
aoqi@0	69	Object o = (Runnable)()-> {};
aoqi@0	70
aoqi@0	71	o = (Runnable)()-> {
aoqi@0	72	switch (assertionStr) {
aoqi@0	73	case "Runnable1 Runnable2 ":
aoqi@0	74	assertionStr += "Runnable3 ";
aoqi@0	75	break;
aoqi@0	76	default:
aoqi@0	77	throw new AssertionError();
aoqi@0	78	}
aoqi@0	79	return;
aoqi@0	80	};
aoqi@0	81
aoqi@0	82	//method parameter:
aoqi@0	83	test1(()-> { assertionStr += "Runnable4 "; return; });
aoqi@0	84
aoqi@0	85	LambdaTest1 test = new LambdaTest1();
aoqi@0	86	test.test2((Runnable)()-> { assertionStr += "Runnable5 "; });
aoqi@0	87
aoqi@0	88	//return type:
aoqi@0	89	r = test.test3();
aoqi@0	90	r.run();
aoqi@0	91
aoqi@0	92	assertTrue(assertionStr.equals("Runnable1 Runnable2 Runnable4 Runnable5 Runnable6"));
aoqi@0	93
aoqi@0	94	//lambda expressions for SAM interface Comparator<T>:
aoqi@0	95	List<Integer> list = new ArrayList<Integer>();
aoqi@0	96	list.add(4);
aoqi@0	97	list.add(10);
aoqi@0	98	list.add(-5);
aoqi@0	99	list.add(100);
aoqi@0	100	list.add(9);
aoqi@0	101	Collections.sort(list, (Integer i1, Integer i2)-> i2 - i1);
aoqi@0	102	String result = "";
aoqi@0	103	for(int i : list)
aoqi@0	104	result += i + " ";
aoqi@0	105	assertTrue(result.equals("100 10 9 4 -5 "));
aoqi@0	106
aoqi@0	107	Collections.sort(list,
aoqi@0	108	(i1, i2) -> {
aoqi@0	109	String s1 = i1.toString();
aoqi@0	110	String s2 = i2.toString();
aoqi@0	111	return s1.length() - s2.length();
aoqi@0	112	});
aoqi@0	113	result = "";
aoqi@0	114	for(int i : list)
aoqi@0	115	result += i + " ";
aoqi@0	116	assertTrue(result.equals("9 4 10 -5 100 "));
aoqi@0	117	}
aoqi@0	118	}