109 lines
3.4 KiB
Java
109 lines
3.4 KiB
Java
/*
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* Copyright (c) 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 8220041
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* @summary Verify variable capture works inside switch expressions which are
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* inside variable declarations
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* @compile LambdaCapture.java
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*/
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import java.util.Objects;
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public class LambdaCapture {
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public static void main(String... args) {
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new LambdaCapture().run();
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}
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void run() {
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assertEquals("00", lambdaCapture1(0).t());
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assertEquals("12", lambdaCapture1(1).t());
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assertEquals("D", lambdaCapture1(2).t());
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assertEquals("D", lambdaCapture1(3).t());
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assertEquals("00", lambdaCapture2(0).t());
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assertEquals("12", lambdaCapture2(1).t());
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assertEquals("D", lambdaCapture2(2).t());
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assertEquals("D", lambdaCapture2(3).t());
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}
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I<String> lambdaCapture1(int i) {
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int j = i + 1;
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I<String> r = switch (i) {
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case 0 -> () -> "0" + i; //capture parameter
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case 1 -> () -> "1" + j; //capture local variable
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default -> {
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String k = "D";
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yield () -> k; //capture local from the switch expr.
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}
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};
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return r;
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}
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I<String> lambdaCapture2(int i) {
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int j = i + 1;
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return switch (i) {
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case 0 -> () -> "0" + i; //capture parameter
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case 1 -> () -> "1" + j; //capture local variable
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default -> {
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String k = "D";
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yield () -> k; //capture local from the switch expr.
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}
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};
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}
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{
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int j1 = 1;
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I<String> r1 = switch (j1) {
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case 1 -> () -> "1" + j1; //capture local variable
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default -> {
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String k = "D";
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yield () -> k; //capture local from the switch expr.
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}
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};
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assertEquals("11", r1.t());
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int j2 = 2;
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I<String> r2 = switch (j2) {
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case 1 -> () -> "1" + j2; //capture local variable
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default -> {
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String k = "D";
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yield () -> k; //capture local from the switch expr.
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}
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};
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assertEquals("D", r2.t());
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}
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private void assertEquals(Object expected, Object actual) {
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if (!Objects.equals(expected, actual)) {
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throw new AssertionError("Unexpected value: " + actual);
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}
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}
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interface I<T> {
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public T t();
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}
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}
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