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add method

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This commit is contained in:
Looly 2023-12-12 19:24:08 +08:00
parent 5550617976
commit 14e53d6e3c
2 changed files with 26 additions and 26 deletions
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9
hutool-core/src/main/java/org/dromara/hutool/core/util/ByteUtil.java
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@ -638,10 +638,11 @@ public class ByteUtil {
*
* @param buf 无符号bytes
* @return 为 1 的个数
* @see Integer#bitCount(int)
*/
public static int bitCount(final byte[] buf) {
int sum = 0;
for (byte b : buf) {
for (final byte b : buf) {
sum += Integer.bitCount((b & 0xFF));
}
return sum;
@ -654,9 +655,9 @@ public class ByteUtil {
* @return 位数为1的索引集合
*/
public static List<Integer> toUnsignedBitIndex(final byte[] bytes) {
List<Integer> idxList = new LinkedList<>();
StringBuilder sb = new StringBuilder();
for (byte b : bytes) {
final List<Integer> idxList = new LinkedList<>();
final StringBuilder sb = new StringBuilder();
for (final byte b : bytes) {
sb.append(StrUtil.padPre(Integer.toBinaryString((b & 0xFF)), 8, "0"));
}
final String bitStr = sb.toString();

11
hutool-core/src/test/java/org/dromara/hutool/core/util/ByteUtilTest.java
View File

@ -196,16 +196,15 @@ public class ByteUtilTest {
@Test
public void toUnsignedBitIndex() {
byte[] bytes = {0, 13, -64, -31, 101, 88, 47, -64};
List<Integer> list = ByteUtil.toUnsignedBitIndex(bytes);
Console.log(list);
final byte[] bytes = {0, 13, -64, -31, 101, 88, 47, -64};
final List<Integer> list = ByteUtil.toUnsignedBitIndex(bytes);
Assertions.assertEquals("[12, 13, 15, 16, 17, 24, 25, 26, 31, 33, 34, 37, 39, 41, 43, 44, 50, 52, 53, 54, 55, 56, 57]", list.toString());
}
@Test
public void bitCount() {
byte[] bytes = {0, 13, -64, -31, 101, 88, 47, -64};
int count = ByteUtil.bitCount(bytes);
Console.log(count);
final byte[] bytes = {0, 13, -64, -31, 101, 88, 47, -64};
final int count = ByteUtil.bitCount(bytes);
Assertions.assertEquals(count, ByteUtil.toUnsignedBitIndex(bytes).size());
}
}