Practical Examples
Timestamp Comparison
public class TimestampComparisonExample {
public static void main(String[] args) {
long currentTime = System.currentTimeMillis();
long futureTime = currentTime + 86400000L; // 24 hours later
// Compare timestamps
if (futureTime > currentTime) {
System.out.println("Future event is scheduled");
}
// Calculate time difference
long timeDifference = futureTime - currentTime;
System.out.println("Time difference: " + timeDifference + " milliseconds");
}
}
Sorting Large Numeric Collections
public class LongSortingExample {
public static void main(String[] args) {
List<Long> largeNumbers = Arrays.asList(
1000000000L,
5000000000L,
2000000000L,
3000000000L
);
// Sort using Long comparison
Collections.sort(largeNumbers, Long::compare);
// Print sorted numbers
largeNumbers.forEach(System.out::println);
}
}
Numeric Range Validation
public class RangeValidationExample {
public static void main(String[] args) {
long minValue = 0L;
long maxValue = 1_000_000_000L;
// Validate numeric ranges
long userInput = 500_000_000L;
boolean isInRange = userInput >= minValue && userInput <= maxValue;
System.out.println("Is in range: " + isInRange);
}
}
Comparison Workflow
graph TD
A[Input Long Values] --> B{Comparison Needed}
B --> |Equality| C[Check ==]
B --> |Ordering| D[Use Long.compare()]
B --> |Range Check| E[Validate Min/Max]
C --> F[Return Boolean Result]
D --> F
E --> F
Scénario |
Méthode recommandée |
Impact sur les performances |
Égalité simple |
== |
Meilleures performances |
Tri |
Long.compare() |
Performances modérées |
Comparaisons complexes |
Comparator |
Flexible |
Advanced Comparison in LabEx Scenarios
public class AdvancedComparisonExample {
public static void main(String[] args) {
// Complex comparison with multiple conditions
long[] values = {100L, 200L, 300L, 400L};
long result = Arrays.stream(values)
.filter(v -> v > 150L)
.min()
.orElse(-1L);
System.out.println("Minimum value above 150: " + result);
}
}
Error Handling in Long Comparisons
public class SafeComparisonExample {
public static Long safeCompare(Long a, Long b) {
try {
return (a != null && b != null)
? Long.compare(a, b)
: null;
} catch (NullPointerException e) {
System.err.println("Comparison failed: Null value detected");
return null;
}
}
}
En explorant ces exemples pratiques, les développeurs peuvent acquérir des connaissances sur les techniques efficaces de comparaison de valeurs de type long dans divers scénarios de programmation Java, en particulier dans des environnements critiques en termes de performances comme LabEx.