Merge branch 'master' into dependabot/maven/com.github.spotbugs-spotbugs-maven-plugin-4.9.4.0

DenizAltunkapan · web-flow · commit ca0288a23b55 · 2025-08-22T18:01:40.000+02:00
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Set up JDK
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           java-version: 21
           distribution: 'temurin'
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Set up JDK
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           java-version: 21
           distribution: 'temurin'
diff --git a/.github/workflows/infer.yml b/.github/workflows/infer.yml
@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Set up JDK
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           java-version: 21
           distribution: 'temurin'
diff --git a/src/main/java/com/thealgorithms/datastructures/stacks/ReverseStack.java b/src/main/java/com/thealgorithms/datastructures/stacks/ReverseStack.java
@@ -38,6 +38,9 @@ private ReverseStack() {
      * @param stack the stack to reverse; should not be null
      */
     public static void reverseStack(Stack<Integer> stack) {
+        if (stack == null) {
+            throw new IllegalArgumentException("Stack cannot be null");
+        }
         if (stack.isEmpty()) {
             return;
         }
diff --git a/src/main/java/com/thealgorithms/others/ReverseStackUsingRecursion.java b/src/main/java/com/thealgorithms/others/ReverseStackUsingRecursion.java
diff --git a/src/test/java/com/thealgorithms/datastructures/stacks/ReverseStackTest.java b/src/test/java/com/thealgorithms/datastructures/stacks/ReverseStackTest.java
@@ -1,13 +1,19 @@
 package com.thealgorithms.datastructures.stacks;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.Stack;
 import org.junit.jupiter.api.Test;
 
 class ReverseStackTest {
 
+    @Test
+    void testReverseNullStack() {
+        assertThrows(IllegalArgumentException.class, () -> ReverseStack.reverseStack(null), "Reversing a null stack should throw an IllegalArgumentException.");
+    }
+
     @Test
     void testReverseEmptyStack() {
         Stack<Integer> stack = new Stack<>();
diff --git a/src/test/java/com/thealgorithms/others/ReverseStackUsingRecursionTest.java b/src/test/java/com/thealgorithms/others/ReverseStackUsingRecursionTest.java
