What are the common mistakes when debugging Java functions?

Common mistakes when debugging Java functions include: Unhandled exceptions: Make sure to catch all potential exceptions. No breakpoints: Set breakpoints to pause execution and examine variables. Incorrect variable value: Check the variable value carefully to identify unexpected results. Logic Errors: Check the code line by line for conditions or calculations that may have caused the error. Concurrency issues: Use synchronization primitives, such as locks and barriers, to ensure data integrity.

Common errors when debugging Java functions

When debugging Java functions, programmers may encounter the following common errors:

• Unhandled exceptions: When a function throws an uncaught exception, it may cause the program to terminate unexpectedly. Make sure to catch all potential exceptions using try-catch blocks.
• No breakpoints: Breakpoints can be set in the code to pause execution at specific points and examine variable status. If breakpoints are not set, it may be difficult to identify the problem.
• Incorrect variable value: During debugging, it is critical to carefully examine variable values ​​to identify unexpected results. Use a debugger to examine variable values ​​and consider using debug statements to output values.
• Logic Error: A logic error can be difficult to identify because it does not result in an exception or obvious error. Go through the code line by line to look for conditions or calculations that may cause errors.
• Concurrency issues: In a multi-threaded environment, concurrency issues can be difficult to debug. Use synchronization primitives, such as locks and barriers, to ensure data integrity.

Actual case:

import java.util.List;

public class ListModifier {

    public static void modifyList(List<Integer> list) {
        for (int i = 0; i < list.size(); i++) {
            list.remove(i); // 导致 ConcurrentModificationException
        }
    }

    public static void main(String[] args) {
        List<Integer> list = List.of(1, 2, 3);
        modifyList(list); // 抛出 ConcurrentModificationException
    }
}

Error: This code throws ConcurrentModificationException because when traversing the list Modify the list.

Solution: Use Iterator or ListIterator to correctly traverse the list, or use Collections.unmodifiableList() encapsulation List to prevent modification.

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