80 lines
2.4 KiB
Java
80 lines
2.4 KiB
Java
/*
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* Copyright (c) 2018, 2019, 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 8206986
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* @summary Check fall through in switch expressions.
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* @compile ExpressionSwitchFallThrough.java
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* @run main ExpressionSwitchFallThrough
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*/
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import java.util.Objects;
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import java.util.function.Function;
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public class ExpressionSwitchFallThrough {
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public static void main(String... args) {
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new ExpressionSwitchFallThrough().run();
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}
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private void run() {
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runTest(this::expression1);
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runTest(this::expression2);
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}
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private void runTest(Function<T, String> print) {
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check(T.A, print, "ab");
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check(T.B, print, "b");
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check(T.C, print, "");
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}
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private String expression1(T t) {
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String help = "";
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return switch (t) {
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case A: help = "a";
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case B: help += "b";
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default: yield help;
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};
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}
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private String expression2(T t) {
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String help = "";
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return switch (t) {
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case A: help = "a";
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case B: help += "b";
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default: yield help;
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};
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}
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private void check(T t, Function<T, String> print, String expected) {
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String result = print.apply(t);
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if (!Objects.equals(result, expected)) {
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throw new AssertionError("Unexpected result: " + result);
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}
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}
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enum T {
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A, B, C;
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}
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}
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