添加重载方法。

src/main/java/xyz/zhouxy/plusone/commons/util/NumberUtil.java

@@ -27,7 +27,15 @@ public class NumberUtil {
         throw new IllegalStateException("Utility class");
     }
 
-    public static int sum(int... numbers) {
+    public static int sum(short... numbers) {
+        int result = 0;
+        for (short number : numbers) {
+            result += number;
+        }
+        return result;
+    }
+
+    public static long sum(int... numbers) {
         int result = 0;
         for (int number : numbers) {
             result += number;
@@ -42,4 +50,20 @@ public class NumberUtil {
         }
         return result;
     }
+
+    public static double sum(float... numbers) {
+        double result = 0;
+        for (double number : numbers) {
+            result += number;
+        }
+        return result;
+    }
+
+    public static double sum(double... numbers) {
+        double result = 0;
+        for (double number : numbers) {
+            result += number;
+        }
+        return result;
+    }
 }

src/test/java/xyz/zhouxy/plusone/commons/EnumerationTests.java

@@ -0,0 +1,39 @@
+package xyz.zhouxy.plusone.commons;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+import xyz.zhouxy.plusone.commons.util.Enumeration;
+
+class EnumerationTests {
+
+    @Test
+    void testEnumeration() {
+        assertEquals(EntityStatus.AVAILABLE, EntityStatus.of(0));
+    }
+}
+
+final class EntityStatus extends Enumeration<EntityStatus> {
+
+    private EntityStatus(int value, String name) {
+        super(value, name);
+    }
+
+    // 常量
+    public static final EntityStatus AVAILABLE = new EntityStatus(0, "正常");
+    public static final EntityStatus DISABLED = new EntityStatus(1, "禁用");
+
+    private static final EnumerationValuesHolder<EntityStatus> ENUMERATION_VALUES = new EnumerationValuesHolder<>(
+            AVAILABLE,
+            DISABLED);
+
+    public static EntityStatus of(int value) {
+        return ENUMERATION_VALUES.get(value);
+    }
+
+    @Override
+    public String toString() {
+        return "EntityStatus" + super.toString();
+    }
+}

src/test/java/xyz/zhouxy/plusone/commons/util/NumberUtilTest.java

@@ -0,0 +1,35 @@
+package xyz.zhouxy.plusone.commons.util;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class NumberUtilTest {
+    @Test
+    void testSum() {
+        long result = 0;
+        for (int i = 0; i < Integer.MAX_VALUE; i++) {
+            result += Short.MAX_VALUE;
+        }
+        System.out.println("Integer.MAX_VALUE: " + Integer.MAX_VALUE);
+        System.out.println("result: " + result);
+        assertFalse(Integer.MAX_VALUE > result);
+
+        result = 0;
+        for (int i = 0; i < Integer.MAX_VALUE; i++) {
+            result += Short.MAX_VALUE;
+        }
+        System.out.println("Long.MAX_VALUE: " + Long.MAX_VALUE);
+        System.out.println("result: " + result);
+        assertTrue(Long.MAX_VALUE > result);
+
+        result = 0;
+        for (int i = 0; i < Integer.MAX_VALUE; i++) {
+            result += Integer.MAX_VALUE;
+        }
+        System.out.println("Long.MAX_VALUE: " + Long.MAX_VALUE);
+        System.out.println("result: " + result);
+        assertTrue(Long.MAX_VALUE > result);
+    }
+}