[meaning-of-->] the meaning of --> (#14678)

core-java-modules/core-java-lang-operators-2/src/test/java/com/baeldung/doubleminusgreaterthan/DoubleMinusAndGreaterThanUnitTest.java

@@ -0,0 +1,66 @@
+package com.baeldung.doubleminusgreaterthan;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.Lists;
+
+public class DoubleMinusAndGreaterThanUnitTest {
+
+    @Test
+    void whenUsingDoubleMinusAndGreaterThan_thenGetTheExpectedResult() {
+        List<Integer> resultWhile = new ArrayList<>();
+        int i = 6;
+        while (i-- > 0) {
+            resultWhile.add(i);
+        }
+        assertEquals(Lists.newArrayList(5, 4, 3, 2, 1, 0), resultWhile);
+
+        List<Integer> resultFor = new ArrayList<>();
+        for (int j = 6; j-- > 0; ) {
+            resultFor.add(j);
+        }
+
+        assertEquals(Lists.newArrayList(5, 4, 3, 2, 1, 0), resultFor);
+    }
+
+    @Test
+    void whenUsingOtherOperatorsSimilarly_thenGetTheExpectedResult() {
+        // <++
+        List<Integer> result = new ArrayList<>();
+        int i = -1;
+        while (i++ < 5) {
+            result.add(i);
+        }
+        assertEquals(Lists.newArrayList(0, 1, 2, 3, 4, 5), result);
+
+        // <--
+        result.clear();
+        int j = 10;
+        while (0 < --j) {
+            result.add(j);
+        }
+        assertEquals(Lists.newArrayList(9, 8, 7, 6, 5, 4, 3, 2, 1), result);
+
+        // >++
+        result.clear();
+        int n = 0;
+        while (6 > ++n) {
+            result.add(n);
+        }
+        assertEquals(Lists.newArrayList(1, 2, 3, 4, 5), result);
+
+        // >>>=
+        result.clear();
+        int x = 32;
+        while ((x >>>= 1) > 1) {
+            result.add(x);
+        }
+        assertEquals(Lists.newArrayList(16, 8, 4, 2), result);
+
+    }
+}