异常处理盲点分析：Java try-catch-finally应用示例

原创野性酷女 2024-09-23 21:33 48阅读 0赞

在Java编程中，异常处理是一个关键环节，它用于捕获和处理程序运行时可能出现的错误。以下是try-catch-finally应用示例：

1. 普通异常捕获：
```java
public class ExceptionHandlingExample {
    public static void main(String[] args) {
        // 假设进行除法操作可能会出现ArithmeticException
        try {
            int numerator = 10;
            int denominator = 2;

double result = (double) numerator / denominator; // 这里会抛出ArithmeticException

System.out.println(" division successful with result: " + result);
        } catch (ArithmeticException e) {
            System.err.println(" caught arithmetic exception: " + e.getMessage());
        } finally {
            System.out.println(" execution complete, regardless of exceptions.");
        }
    }
}
```
2. 处理资源异常：
```java
import java.sql.Connection;
import java.sql.DriverManager;

public class ResourceExceptionHandlingExample {
    public static void main(String[] args) {
        // 假设连接数据库时会抛出SQLException
        try (Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "username", "password")) {
            System.out.println(" database connection successful.");
        } catch (SQLException e) {
            System.err.println(" caught sql exception: " + e.getMessage());
            // 关闭资源，减少资源泄漏风险
            try {
                if (connection != null) {
                    connection.close();
                }
            } catch (SQLException ex) {
                System.err.println(" error closing database connection: " + ex.getMessage());
            }
        } finally {
            System.out.println(" execution complete, regardless of exceptions.");
        }
    }
}
```
以上示例展示了如何使用try-catch-finally结构来处理和控制可能出现的异常。