test/langtools/tools/javac/T8222795/ConditionalAndPostfixOperator.java

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/*
 * @test
 * @bug 8222169
 * @summary post inc operator inside compute function of HashMap results in Exception
 * @compile ConditionalAndPostfixOperator.java
 * @run main ConditionalAndPostfixOperator
 */

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

public class ConditionalAndPostfixOperator {
    public static void main(String... args) {
        Map<String, Integer> m = new HashMap<>();
        String key = "a";
        m.put(key, val());
        assertEquals(2, m.compute(key, (k, v) -> (v > 5) ? v-- : v++));

        Integer v = val();

        assertEquals(2, (v > 5) ? v-- : v++);
        assertEquals(3, v);
    }

    static void assertEquals(Integer expected, Integer actual) {
        if (!Objects.equals(expected, actual)) {
            throw new AssertionError("Expected: " + expected + ", " +
                                     "actual: " + actual);
        }
    }

    static int val() { return 2; }

}