Java 程序使用 finally 块捕获异常

2024 年 9 月 10 日 | 阅读 3 分钟

块是 IT 领域中最有用的行业实践之一。在 IT 项目的开发周期中，需要创建和维护一些必要代码。这些必要的代码行必须放在 try 块中，以标记它们为干净代码，例如，在开发的项目中关闭文件或关闭建立的连接。

Finally 块在三种情况下广泛使用，下面将通过 Java 编程语言的相关代码进行讨论。

情况 1：当没有发生异常时

Java 代码

// here, we are writing down the java programming language to demonstrate the
// use of concept Java Program to Use finally block for Catching Exceptions
// with easy-to-understand example code in java with their outputs
import java.io.*;

class JTP {
	public static void main(String[] args)
	{
		try {
			System.out.println("hey! coder we are inside the try block now");
			
			// the below code snippet will not throw us any sort of 
			//exception
			System.out.println(84 / 2);
		}
		
		// in the below case java code snippet, we are writing down the 
		//execution of the program will not take place
		catch (ArithmeticException e) {
			
			System.out.println("hey coder it is an arithmetic exception");
			
		}
		// in the below case java code snippet, we are writing down the 
		//execution of the program will be executed always
		finally {
			
			System.out.println(
				"hey coder, finally: i executed always has taken place !");
			
		}
	}
}

输出

java -cp / tmp /pk kY 1yo G xa  JTP
hey! Coder, we are inside the try block now
42
Hey, code,r finally: i executed consistently has taken place!

情况 2：当异常发生并由 Catch 块处理时

Java 代码

// here, we are writing down the java programming language to demonstrate 
//the case where the exception has been raised, and it is handled by catch
// use of concept Java Program to Use finally block for Catching Exceptions
// with easy-to-understand example code in java with their outputs


import java.io.*;

class JTP {
	
	public static void main(String[] args)
	{
		try {
			System.out.println("hey! coder we are inside the try block now");

			// the below code snippet will throw us the arithmetic  
			//exception

			System.out.println(84 / 0);
		}


		// the below code snippet will catch the arithmetic  
			//exception that is raised
		catch (ArithmeticException e) {

			System.out.println(
				"hey, coder, the catch: exception has been handled.");
		}

		// in the below case java code snippet, we are writing down the 
		//execution of the program will be executed always

		finally {
			
		System.out.println("hey coder, finally : i executed always has taken place !");
		}
	}
}

输出

java -cp  /tmp /pk kY 1y oG X a JTP
hey! Coder, we are inside the try block now
hey, coder, the catch: exception has been handled.
Hey coder, finally: i executed consistently has taken place!

情况 3：当异常发生但未由 Catch 块处理时

Java 代码

// here, we are writing down the java programming language to demonstrate 
//the case where the exception has been raised, and it is handled by catch
// use of concept Java Program to Use finally block for Catching Exceptions
// with easy-to-understand example code in java with their outputs

import java.io.*;

class JTP {
	public static void main(String[] args)
	{
		try {
			System.out.println("hey! coder we are inside the try block now");

			// the below code snippet will throw us the arithmetic  
			//exception

			System.out.println(84 / 0);
		}

		
		// the below code snippet will not accept and catch the arithmetic  
		//exception that is raised it is entitled only to accept the NULL
		//pointer exception

		catch (NullPointerException e) {

			System.out.println(
				"hey, coder, the catch: exception has not been handled.");
		}

		// in the below case java code snippet, we are writing down the 
		//execution of the program will be executed always

		finally {

			System.out.println(
				"hey coder, finally: i executed always has taken place !");
		}
		//the below small code we have written for testing purposes will not 
		//be executed anymore
		System.out.println("hey coder, I want to run the thread mill!");
	}
}

输出

java -cp  /tm p/pkkY 1yo GXa JTP
hey! Coder, we are inside the try block nowhere coder, finally: i executed always has taken place!
Exception in thread "main" java. Lang.ArithmeticException: / by zero at JTP.main(JTP.java:17)

下一个主题Java 中的运行时多态

Java 程序使用 finally 块捕获异常

情况 1：当没有发生异常时

情况 2：当异常发生并由 Catch 块处理时

情况 3：当异常发生但未由 Catch 块处理时

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Java 程序使用 finally 块捕获异常

情况 1：当没有发生异常时

情况 2：当异常发生并由 Catch 块处理时

情况 3：当异常发生但未由 Catch 块处理时

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