throw Keyword

Throwing exceptions manually

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throw Keyword

The throw keyword is used to explicitly throw an exception.

Code Examples

Manually throwing an exception

java
1
2if (age < 18) {
3    throw new IllegalArgumentException("Age must be 18+");
4}
5

Use Cases

  • Business rule validation
  • Custom error signaling

Common Mistakes to Avoid

  • Throwing generic exceptions
  • Not documenting thrown exceptions