122 lines
2.7 KiB
Java
122 lines
2.7 KiB
Java
class SwitchTests // JDK 21+.
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{
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static void echo(Object o) { System.out.println(o); }
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static {
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interface Yieldable<T>
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{
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T yield();
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default Yieldable<T> default_() { return this; }
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default Yieldable<T> when() { return this; }
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}
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// There are 80 bytes (\@80<!) between "::" and "yield;".
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Yieldable<?> y = ((Yieldable<?>) () -> 0)::
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yield;
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((Yieldable<?>) () -> 0).when().default_().yield();
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enum Letters { OTHER, ALPHA, BETA }
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Letters when = Letters.OTHER;
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switch (when) {
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case ALPHA: { echo(Letters.ALPHA); break; }
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case BETA: { echo(Letters.BETA); break; }
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default: { echo(Letters.OTHER); }
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}
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echo(switch (when) {
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case ALPHA -> Letters.ALPHA;
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case BETA -> Letters.BETA;
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default -> { yield(Letters.OTHER); }
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});
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String yield = null;
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switch (yield) {
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case "A": case "B": { echo("A or B"); break; }
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case ":": { echo("Colon"); break; }
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case String str when !str.equals(""):
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{ echo("<non-empty>"); break; }
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case null: default: { echo("Other"); }
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}
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echo(switch (yield) {
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case "A", "B" -> { yield("A or B"); }
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case "->" -> "Arrow";
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case String str when !str.equals("")
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-> "<non-empty>";
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case null, default -> "Other";
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});
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Object o = new Object();
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switch (o) {
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case null: { echo("null"); break; }
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case Letters[] ll: { echo("SwitchTests$1Letters[]"); break; }
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default: { echo("java.lang.Object"); break; }
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}
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echo(switch (o) {
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case null -> "null";
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case Letters[] ll -> "SwitchTests$1Letters[]";
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default -> "java.lang.Object";
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});
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char ch = 'c';
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switch (ch) {
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case 'a': { echo('a'); break; }
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case 'b': { echo('b'); break; }
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default: { echo('\u0000'); break; }
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}
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echo(switch (ch) {
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case 'a' -> 'a';
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case 'b' -> 'b';
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default -> '\u0000';
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});
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byte b = (byte) 2;
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switch (b) {
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case ((byte) 0): { echo((byte) 0); break; }
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case ((byte) 1): { echo((byte) 1); break; }
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default: { echo((byte) -1); break; }
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}
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echo(switch (b) {
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case ((byte) 0) -> (byte) 0;
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case ((byte) 1) -> (byte) 1;
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default -> (byte) -1;
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});
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short sh = (short) 2;
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switch (sh) {
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case ((short) 0): { echo((short) 0); break; }
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case ((short) 1): { echo((short) 1); break; }
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default: { echo((short) -1); break; }
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}
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echo(switch (sh) {
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case ((short) 0) -> (short) 0;
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case ((short) 1) -> (short) 1;
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default -> (short) -1;
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});
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int i = 2;
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switch (i) {
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case 0b0__00___000: { echo(0); break; }
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case 0x000___00__1: { echo(1); break; }
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default: { echo(-1); break; }
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}
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echo(switch (i) {
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case 0_0_0_0_0 -> 0;
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case 1 -> 1;
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default -> -1;
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});
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}
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}
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