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Java Throws Keyword

By Shiva

Published On:

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Java Throws Keyword

In Java, the throws keyword is used to declare exceptions that might be thrown during the execution of a method. Instead of handling the exception within the method, you inform the caller that it needs to handle the potential exception. This improves code readability and reduces redundancy.

  1. Cleaner Code: Eliminates the need for multiple try-catch blocks.
  2. Better Exception Management: Helps in handling multiple exceptions efficiently.
  3. Encourages Proper Error Handling: Forces the caller to acknowledge and handle exceptions.
java

returnType methodName(parameters) throws ExceptionType1, ExceptionType2 {
// Method Code
}
java

import java.io.*;

class Example {
public static void writeFile() throws IOException {
FileWriter file = new FileWriter("C:\\Data1.txt");
file.write("Hello, Java!");
file.close();
}

public static void main(String[] args) {
try {
writeFile();
} catch (IOException e) {
System.out.println("An error occurred: " + e.getMessage());
}
}
}

💡 Note: Ensure that Data1.txt exists in the C: drive before running the code.

Featurethrowthrows
PurposeUsed to explicitly throw an exceptionUsed to declare exceptions in method signatures
Number of ExceptionsCan throw only one exception at a timeCan declare multiple exceptions
PlacementInside a methodIn method definition
Examplethrow new IOException("Error!");public void method() throws IOException, SQLException
  • Boosts Code Readability: Avoids cluttered try-catch blocks.
  • Enhances Debugging: Makes it easier to trace errors.
  • Optimized Performance: Reduces unnecessary exception handling overhead.
  • Follows Java Best Practices: Encourages structured exception handling.

The throws keyword is an essential part of Java’s exception handling mechanism. It allows developers to write cleaner, more maintainable code by shifting exception handling responsibility to the method caller. Understanding the difference between throw and throws ensures effective error management in Java applications.

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