Solution to IllegalArgumentException exception in Java

Exception handling in Java is an important part of Java programming. The IllegalArgumentException exception in Java is one of the common exceptions. This exception is usually caused by incorrect parameters passed to the method. In this article, we will introduce what IllegalArgumentException is, how to avoid and deal with it.

1. What is IllegalArgumentException?

The IllegalArgumentException exception in Java is a runtime exception. This exception indicates that a method received an illegal, incorrect, or unavailable parameter. For example, if a method requires a positive integer as a parameter but receives a negative number, an IllegalArgumentException will be thrown.

2. How to avoid IllegalArgumentException?

1. Verify method parameters

When writing a method, you should first validate the method parameters to ensure that they have the required information and format. You can use if statements, switch statements or other verification methods to check the validity of parameters. If the parameter is illegal, a custom exception can be thrown instead of IllegalArgumentException.

2. Provide users with clear parameter requirements

When writing applications, users should be clearly told which parameters are required, what their format is, and how to provide it. these parameters. The user can be prompted in the document or via the GUI (Graphical User Interface).

3. How to handle IllegalArgumentException?

When an IllegalArgumentException exception is thrown, you can use a try-catch block to catch and handle it. When handling exceptions, you can use the following methods:

1. Display exception information

Exception information can be output in the catch block to facilitate debugging and repairing the program.

2. Throw a custom exception

If the IllegalArgumentException exception is foreseeable, you can consider using a custom exception to replace it and declare it using the throws clause in the method. This can make the application more readable and easier to maintain.

3. Change program logic

If the occurrence of IllegalArgumentException exception is caused by a logic error in the program, then you should consider changing the program logic to avoid the occurrence of this exception.

4. Summary

In Java programming, IllegalArgumentException is a very common exception. To avoid problems caused by this exception, you can verify parameter validity when writing code, provide clear parameter requirements, and handle exceptions when they occur. This makes the program more robust and reliable.

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