Code reuse strategy for exception handling in Java

Code reuse strategy for exception handling in Java: catch and handle common exceptions (NullPointerException, IllegalArgumentException, IndexOutOfBoundsException, IOException). Use a try-catch block to catch all exceptions. Use separate catch blocks for specific exceptions. Create custom exception classes to handle custom exceptions. Use code reuse to simplify exception handling, such as encapsulating error handling into the readFileWithErrorHandler method in the file reading example.

Code Reuse Strategy for Exception Handling in Java

An effective way to handle exceptions in Java is code reuse . By catching and handling common exceptions, we can simplify our code and prevent unnecessary manual handling.

Common exceptions

The following are the most common exceptions in Java:

• NullPointerException
• IllegalArgumentException
• IndexOutOfBoundsException
• IOException

Capturing and handling basics Exceptions

The easiest way to reuse code is to use a try-catch block:

try {
  // 代码可能抛出异常
} catch (Exception e) {
  // 处理异常
}

This will catch all exceptions and execute the specified handling code.

Catch specific exceptions

If you want to handle specific exceptions, you can use multiple catch blocks:

try {
  // 代码可能抛出异常
} catch (NullPointerException e) {
  // 处理 NullPointerException
} catch (IllegalArgumentException e) {
  // 处理 IllegalArgumentException
}

Create a custom exception class

For custom exceptions, you can use a subclass of the Exception class:

public class MyCustomException extends Exception {
  // 自定义异常逻辑
}

Then you can throw and catch it in code Custom exception:

try {
  // 代码可能抛出自定义异常
} catch (MyCustomException e) {
  // 处理 MyCustomException
}

Practical example

Consider the following file reading example:

public static void readFile(String filePath) throws IOException {
  BufferedReader reader = new BufferedReader(new FileReader(filePath));
  // 文件读取代码
  reader.close();
}

This method throws IOException , as it may fail due to issues such as file non-existence or insufficient access permissions.

We can use code reuse to simplify error handling:

public static void readFileWithErrorHandler(String filePath) {
  try {
    // 文件读取代码
    readFile(filePath);
  } catch (IOException e) {
    // 异常处理逻辑
  }
}

// 调用文件读取方法
readFileWithErrorHandler("file.txt");

readFileWithErrorHandler method attempts to call the readFile method and catches any # thrown ##IOException.

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