iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

remove unused claSS

This commit is contained in:
@hangga 2024-02-27 08:03:33 +07:00
parent 4bd5580405
commit bdab6799d0
1 changed files with 0 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
core-java-modules/core-java-uuid/src/main/java/com/baeldung/uuid/UUIDPositiveLongGenerator.java
View File

@ -1,83 +0,0 @@
package com.baeldung.uuid;
import java.nio.ByteBuffer;
import java.security.SecureRandom;
import java.util.UUID;
/**
* Methods are called by reflection in the unit test
*/
@SuppressWarnings("unused")
public class UUIDPositiveLongGenerator {
public long getLeastSignificantBits() {
return Math.abs(UUID.randomUUID().getLeastSignificantBits());
}
public long getMostSignificantBits() {
return Math.abs(UUID.randomUUID().getMostSignificantBits());
}
public long combineByteBuffer() {
UUID uuid = UUID.randomUUID();
ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
bb.putLong(uuid.getMostSignificantBits());
bb.putLong(uuid.getLeastSignificantBits());
bb.rewind();
return Math.abs(bb.getLong());
}
public long combineBitwise() {
UUID uniqueUUID = UUID.randomUUID();
long mostSignificantBits = uniqueUUID.getMostSignificantBits();
long leastSignificantBits = uniqueUUID.getLeastSignificantBits();
return Math.abs((mostSignificantBits << 32) | (leastSignificantBits & 0xFFFFFFFFL));
}
public long combineDirect() {
UUID uniqueUUID = UUID.randomUUID();
long mostSignificantBits = uniqueUUID.getMostSignificantBits();
long leastSignificantBits = uniqueUUID.getLeastSignificantBits();
return Math.abs(mostSignificantBits ^ (leastSignificantBits >> 1));
}
public long combinePermutation() {
UUID uuid = UUID.randomUUID();
long mostSigBits = uuid.getMostSignificantBits();
long leastSigBits = uuid.getLeastSignificantBits();
byte[] uuidBytes = new byte[16];
for (int i = 0; i < 8; i++) {
uuidBytes[i] = (byte) (mostSigBits >>> (8 * (7 - i)));
uuidBytes[i + 8] = (byte) (leastSigBits >>> (8 * (7 - i)));
}
long result = 0;
for (byte b : uuidBytes) {
result = (result << 8) | (b & 0xFF);
}
return Math.abs(result);
}
public long combineWithSecureRandom() {
UUID uniqueUUID = UUID.randomUUID();
SecureRandom secureRandom = new SecureRandom();
long randomBits = secureRandom.nextLong();
long mostSignificantBits = uniqueUUID.getMostSignificantBits() ^ randomBits;
long leastSignificantBits = uniqueUUID.getLeastSignificantBits();
return Math.abs((mostSignificantBits << 32) | (leastSignificantBits & 0xFFFFFFFFL));
}
public long combineWithNanoTime() {
UUID uniqueUUID = UUID.randomUUID();
long nanoTime = System.nanoTime();
long mostSignificantBits = uniqueUUID.getMostSignificantBits() ^ nanoTime;
long leastSignificantBits = uniqueUUID.getLeastSignificantBits();
return Math.abs((mostSignificantBits << 32) | (leastSignificantBits & 0xFFFFFFFFL));
}
}