添加重载方法。

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);
+    }
+}