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java long to byte[](原语long,而不是long to byte数组)-两个实现之间不相等

java

-1

PatPanda · 技术社区 · 4 年前

我以前有一小段代码:

import com.datastax.oss.driver.shaded.guava.common.primitives.Ints;

final long timeStamp        = Instant.now().getEpochSecond();
final byte[] timeStampAsBytes = Ints.toByteArray((int) timeStamp);

注意,这个库有一个外部依赖项,还有一个cast,所以我决定重构它,使它更清晰一点。

final long timeStamp        = Instant.now().getEpochSecond();
final byte[]        timeStampAsBytes2 = ByteBuffer.allocate(Long.SIZE / Byte.SIZE).putLong(timeStamp).array();

然而,令人相当惊讶的是,这两者其实并不相等!

final long          timeStamp        = Instant.now().getEpochSecond();
            final byte[] timeStampAsBytes = Ints.toByteArray((int) timeStamp);
            final byte[]        timeStampAsBytes2 = ByteBuffer.allocate(Long.SIZE / Byte.SIZE).putLong(timeStamp).array();
            if (Arrays.equals(timeStampAsBytes, timeStampAsBytes2)) {
                System.out.println("EQUAL");
            } else {
                System.out.println("NOT EQUAL"); //this got printed
            }