b5f0eec3d8
8205393: Add SourceVersion.RELEASE_13 8205394: Add source 13 and target 13 to javac 8205645: Bump maximum recognized class file version to 57 for JDK 13 8214825: Update preview language features for start of JDK 13 Reviewed-by: erikj, alanb, mchung, mcimadamore, dholmes, smarks, jjg
140 lines
3.6 KiB
Java
140 lines
3.6 KiB
Java
/*
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* @test /nodynamiccopyright/
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* @bug 8206986
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* @summary Check expression switch works.
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* @compile/fail/ref=ExpressionSwitch-old.out -source 9 -Xlint:-options -XDrawDiagnostics ExpressionSwitch.java
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* @compile --enable-preview -source 13 ExpressionSwitch.java
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* @run main/othervm --enable-preview ExpressionSwitch
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*/
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import java.util.Objects;
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import java.util.function.Supplier;
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public class ExpressionSwitch {
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public static void main(String... args) {
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new ExpressionSwitch().run();
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}
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private void run() {
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check(T.A, "A");
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check(T.B, "B");
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check(T.C, "other");
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assertEquals(exhaustive1(T.C), "C");
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assertEquals(scopesIsolated(T.B), "B");
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assertEquals(lambdas1(T.B).get(), "B");
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assertEquals(lambdas2(T.B).get(), "B");
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assertEquals(convert1("A"), 0);
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assertEquals(convert1("B"), 0);
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assertEquals(convert1("C"), 1);
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assertEquals(convert1(""), -1);
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assertEquals(convert2("A"), 0);
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assertEquals(convert2("B"), 0);
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assertEquals(convert2("C"), 1);
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assertEquals(convert2(""), -1);
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localClass(T.A);
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}
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private String print(T t) {
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return switch (t) {
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case A -> "A";
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case B -> { break "B"; }
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default -> { break "other"; }
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};
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}
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private String exhaustive1(T t) {
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return switch (t) {
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case A -> "A";
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case B -> { break "B"; }
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case C -> "C";
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case D -> "D";
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};
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}
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private String exhaustive2(T t) {
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return switch (t) {
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case A -> "A";
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case B -> "B";
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case C -> "C";
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case D -> "D";
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};
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}
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private String scopesIsolated(T t) {
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return switch (t) {
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case A -> { String res = "A"; break res;}
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case B -> { String res = "B"; break res;}
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default -> { String res = "default"; break res;}
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};
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}
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private Supplier<String> lambdas1(T t) {
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return switch (t) {
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case A -> () -> "A";
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case B -> { break () -> "B"; }
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default -> () -> "default";
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};
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}
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private Supplier<String> lambdas2(T t) {
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return switch (t) {
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case A: break () -> "A";
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case B: { break () -> "B"; }
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default: break () -> "default";
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};
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}
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private int convert1(String s) {
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return switch (s) {
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case "A", "B" -> 0;
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case "C" -> { break 1; }
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default -> -1;
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};
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}
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private int convert2(String s) {
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return switch (s) {
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case "A", "B": break 0;
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case "C": break 1;
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default: break -1;
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};
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}
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private void localClass(T t) {
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String good = "good";
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class L {
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public String c() {
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STOP: switch (t) {
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default: break STOP;
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}
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return switch (t) {
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default: break good;
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};
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}
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}
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String result = new L().c();
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if (!Objects.equals(result, good)) {
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throw new AssertionError("Unexpected result: " + result);
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}
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}
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private void check(T t, String expected) {
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String result = print(t);
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assertEquals(result, expected);
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}
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private void assertEquals(Object result, Object expected) {
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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, D;
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}
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void t() {
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Runnable r = () -> {};
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r.run();
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}
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}
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