What are the strategies for dealing with different types of Java function errors?

Java function error handling strategy: Validate input: Check the validity of the incoming parameters and reject invalid values. Exception handling: For expected errors, throw custom exceptions to provide detailed information. Return error code or status: For unexpected errors, return an error code to indicate failure, allowing the caller to handle gracefully.

Strategies for handling different types of Java function errors

In Java development, it is crucial to handle function errors correctly to ensure Application stability and robustness. This article describes several strategies for handling different types of Java function errors.

Validate input

A function should always verify that its incoming arguments are valid and reject any invalid values. Use appropriate type checking, range checking, and format validation to ensure the legality of input data.

public int divide(int a, int b) {
    if (b == 0) {
        throw new IllegalArgumentException("Division by zero");
    }
    return a / b;
}

Using Exception Handling

For expected error conditions, you can use exception handling to explicitly handle the error and prevent the function from crashing. For exceptional situations, throw a custom exception to provide detailed error information.

public void openFile(String filename) {
    try {
        FileReader reader = new FileReader(filename);
    } catch (FileNotFoundException e) {
        System.out.println("File not found: " + filename);
    }
}

Return error code or status

For unexpected or recoverable errors, a function can return an error code or status to indicate failure. This allows the caller to handle errors gracefully and take appropriate action.

public int saveData(Object data) {
    try {
        // ...
    } catch (Exception e) {
        return -1; // 错误代码
    }
    return 0; // 成功代码
}

Practical case

Consider a calculateArea() function, which calculates the area of ​​a triangle. This function may throw the following types of errors:

• IllegalArgumentException: if the side length passed in is invalid (e.g. a negative value).
• RuntimeException: If the function fails due to a mathematical calculation error (such as dividing by zero).

Code example:

public double calculateArea(double base, double height) {
    if (base <= 0 || height <= 0) {
        throw new IllegalArgumentException("Invalid triangle dimensions");
    }
    return 0.5 * base * height;
}

By using validated input, exception handling and error codes, we can ensure that the calculateArea() function is Fail gracefully under different error conditions.

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