152 lines
4.2 KiB
Java
152 lines
4.2 KiB
Java
/*
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* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8003280
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* @summary Add lambda tests
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* Test SAM conversion of lambda expressions in context of assignment, method call, return statement and cast.
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* @compile SamConversion.java
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* @run main SamConversion
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*/
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public class SamConversion {
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static interface Foo {
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Integer m(int i);
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}
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static interface Bar {
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int m(Integer i) throws Exception;
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}
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private static String assertionStr = "";
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private static void assertTrue(boolean b) {
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if(!b)
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throw new AssertionError();
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}
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private static void test1(Foo foo) {
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assertTrue(foo.m(1) == 2);
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}
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private static void test2(Bar bar) {
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e){
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assertTrue(false);
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}
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}
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private static Bar test3(int i) {
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switch (i) {
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case 0:
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return n -> n + 1;
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case 1:
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return (Integer n) -> 2 * n;
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case 2:
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return (Integer n) -> {return new Integer(n-1);};
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case 3:
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return n -> {throw new Exception();};
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default:
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return null;
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}
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}
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public static void main(String[] args) {
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//assign:
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Foo foo = (int n) -> n + 1; //explicit type and boxing
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assertTrue(foo.m(1) == 2);
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foo = n -> n + 1; //type inferrred and boxing
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assertTrue(foo.m(1) == 2);
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Bar bar = (Integer n) -> n + 1; //explicit type and unboxing
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = (Integer n) -> new Integer(n+1); //explicit type and unboxing twice
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = n -> n.intValue() + 1; //type inferred
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = n -> n + 1; // type inferred and unboxing
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e) {
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assertTrue(false);
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}
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//cast:
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assertTrue(((Foo)n -> {return n+1;}).m(1) == 2); //statement (instead of expression) in lambda body
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try {
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assertTrue(((Bar)n -> {return n+1;}).m(1) == 2); //statement in lambda body
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} catch (Exception e) {
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assertTrue(false);
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}
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//method parameter:
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test1((int n) -> new Integer(n+1)); //explicit type
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test2((Integer n) -> n.intValue() + 1); //explicit type
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//return statement:
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bar = test3(0);
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = test3(1);
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try {
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assertTrue(bar.m(3) == 6);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = test3(2);
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try {
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assertTrue(bar.m(10) == 9);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = test3(3);
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try {
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bar.m(10);
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assertTrue(false);
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} catch (Exception e) {}
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}
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}
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