diff --git a/core/src/test/java/com/alibaba/fastjson2/util/IOUtilsTest.java b/core/src/test/java/com/alibaba/fastjson2/util/IOUtilsTest.java
index e14e3429b0..05f33de805 100644
--- a/core/src/test/java/com/alibaba/fastjson2/util/IOUtilsTest.java
+++ b/core/src/test/java/com/alibaba/fastjson2/util/IOUtilsTest.java
@@ -1,7 +1,6 @@
 package com.alibaba.fastjson2.util;
 
 import com.alibaba.fastjson2.JSONException;
-import org.apache.arrow.flatbuf.Int;
 import org.junit.jupiter.api.Test;
 
 import java.nio.charset.StandardCharsets;
@@ -374,124 +373,4 @@ public void indexOf() throws Throwable {
                 IOUtils.indexOfChar(
                         bytes, 'a', 1));
     }
-
-    @Test
-    public void x0() {
-        for (int i = 0; i < 256; i++) {
-            byte b = (byte) i;
-            if (b < ' ') {
-                System.out.println(i + "\t" + Integer.toHexString(i));
-            }
-        }
-    }
-
-    @Test
-    public void xor() {
-        for (int i = 0; i < 256; i++) {
-            byte b = (byte) i;
-//            if ((b ^ 0x22) != 0 && (b ^ 0x27) != 0 && (b ^ 0x5c) != 0) {
-//                continue;
-//            }
-//            if (((i & 0x80) != 0)) {
-//                continue;
-//            }
-////
-//            System.out.println(i + "\t" + Integer.toHexString(i) + "\t" + Integer.toHexString((0x70 - i + 0x30) & 0x80) + "\t" + (char) i);
-//
-//            if (contains(i, 0x22)) {
-//                System.out.println(i + "\t" + Integer.toHexString(i) + "\t" + (char) i);
-//            }
-//            if ((b ^ 0x22) == 0) {
-//                System.out.println(i + "\t" + Integer.toHexString(i) + "\t" + (char) i);
-//                continue;
-//            }
-            if (isSpecial(i)) {
-                continue;
-            }
-
-            System.out.println(i + "\t" + Integer.toHexString(i) + "\t" + (char) i);
-        }
-    }
-
-    @Test
-    public void xor_0() {
-        for (int i = 0; i < 256; i++) {
-            if (((i & 0x80) != 0)) {
-                continue;
-            }
-
-            int x = i >> 4;
-
-            System.out.println(i + "\t" + Integer.toHexString(x) + "\t" + Integer.toHexString((((0x7 - x + 0x3) & 0x8))) + "\t" + (char) i);
-        }
-    }
-
-    public static boolean isSpecial(long data) {
-        long xed = data ^ 0x2222_2222_2222_2222L;
-        long xf0 = data ^ 0x5c5c5c5c5c5c5c5cL;
-
-        xed = (xed - 0x0101010101010101L) & ~xed;
-        xf0 = (xf0 - 0x0101010101010101L) & ~xf0;
-
-        return ((xed | xf0 | (0x7F7F_7F7F_7F7F_7F7FL - data + 0x1010_1010_1010_1010L) | data) & 0x8080808080808080L) != 0;
-    }
-
-    public static boolean isSpecial1(long data) {
-        // 在Java中，long是有符号的，所以我们需要确保我们正确处理高字节。
-        long xed = data ^ 0xededededededededL;
-        long xf0 = (data | 0x1010101010101010L) ^ 0xf0f0f0f0f0f0f0f0L;
-        long xf4 = data ^ 0xf4f4f4f4f4f4f4f4L;
-
-        // Java没有&^运算符，所以用~和&来模拟
-        xed = (xed - 0x0101010101010101L) & ~xed;
-        xf0 = (xf0 - 0x0101010101010101L) & ~xf0;
-        xf4 = (xf4 - 0x0101010101010101L) & ~xf4;
-
-        return ((xed | xf0 | xf4) & 0x8080808080808080L) != 0;
-    }
-
-
-    public static boolean contains(long data, long mask) {
-        // Perform XOR on data and mask
-        data ^= mask;
-
-        // Subtract the magic number from data
-        // Use a mask to emulate unsigned behavior for the highest bit
-        long magic = 0x0101010101010101L;
-        long highBitMask = 0x8080808080808080L;
-        long result = (data - magic) & ~data & highBitMask;
-
-        // Return true if any byte in the result is non-zero
-        return result != 0;
-    }
-
-
-
-    @Test
-    public void xor_1() {
-        long MASK = 0x2222_2222_2222_2222L;
-        long[] values = {
-                0x1522_1314_1522_1314L,
-                0x1534_1534_1534_1534L,
-                MASK,
-         };
-        for (long i : values) {
-            System.out.println(Long.toHexString(i) + "\t" + isSpecial(i));
-        }
-    }
-
-    @Test
-    public void x6() {
-        for (int i = 0; i < 6; i++) {
-            int x = i << 4;
-            System.out.println(i + "\t" + x + "\t" + (x ^ 0x70) + "\t" + (((x ^ 0x70) + 0x20) & 0x80));
-        }
-    }
-
-    @Test
-    public void hex() {
-        for (int i = 0; i < 16; i++) {
-            System.out.println(i + "\t" + Integer.toHexString(i) + "\t" + Integer.toBinaryString(i));
-        }
-    }
 }