Different exception types in Java and how to handle them
- 王林Original
- 2024-05-03 13:39:01662browse
There are two types of exceptions in Java: unchecked exceptions (RuntimeException) and checked exceptions (Exception). Unchecked exceptions do not need to be declared or caught, while checked exceptions need to be declared or caught in order to be handled. With try-catch blocks, you can handle exceptions, prevent program crashes, and provide meaningful error information. The practical case shows how to handle file reading exception IOException through try-catch block.
Different exception types in Java and how to handle them
Introduction
Exceptions are events in a Java program that cannot execute normally. They are raised at runtime and provide information about the error. Understanding the different types of exceptions and knowing how to handle them is critical to writing robust, reliable programs.
Common exception types
1. RuntimeException
- Unchecked exception that does not need to be declared or caught .
- For example:
NullPointerException,IndexOutOfBoundsException
##2. Exception
- Checked exceptions need to be declared or caught.
- For example:
- IOException
,SQLException
Exceptions can be passed
try-catch Block processing: <pre class='brush:java;toolbar:false;'>try {
// 代码可能引发异常
} catch (ExceptionClassName e) {
// 捕获并处理异常
}</pre>
The following code demonstrates how to handle
IOException Exception, which may be thrown while reading a file: <pre class='brush:java;toolbar:false;'>import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class FileReading {
public static void main(String[] args) {
try {
// 打开文件
File file = new File("data.txt");
Scanner scanner = new Scanner(file);
// 读取并打印文件内容
while (scanner.hasNextLine()) {
System.out.println(scanner.nextLine());
}
scanner.close();
} catch (FileNotFoundException e) {
// 处理文件未找到异常
e.printStackTrace();
}
}
}</pre>
Understanding the different exception types and how to handle them is essential for writing robust Java programs important. By using
try-catch blocks, exceptions can be handled gracefully, preventing program crashes and providing meaningful error information.
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