java编程基础(五)----异常
2021-01-22 16:15
标签:系统 编译 system except 方式 run 使用 自己 保存 异常分类: Error:系统内部错误或者资源耗尽(不用太管); Exception:程序有关的异常(重点关注); java程序相关异常又分为: try-catch-finally:一种保护代码正常运行的机制。 结构: 代码示例: 多catch块处理: 嵌套结构: try结构中,如果有finally块,finally肯定会被执行。 try-catch-finally每个模块里面会发生异常,所以也可以在内部继续写一个完整的try结构。 try { try-catch-finally } catch() { try-catch-finally } finally { try-catch-finally } 代码示例: java编程基础(五)----异常 标签:系统 编译 system except 方式 run 使用 自己 保存 原文地址:https://www.cnblogs.com/Yunus-ustb/p/12887718.html异常概述:
异常处理
目的
具体方法:
public class TryDemo {
public static void main(String[] args) {
try
{
int a = 5/2; //无异常
System.out.println("a is " + a);
}
catch(Exception ex)
{
ex.printStackTrace();
}
finally
{
System.out.println("Phrase 1 is over");
}
try
{
int a = 5/0; //ArithmeticException
System.out.println("a is " + a);
}
catch(Exception ex)
{
ex.printStackTrace();
}
finally
{
System.out.println("Phrase 2 is over");
}
try
{
int a = 5/0; //ArithmeticException
System.out.println("a is " + a);
}
catch(Exception ex)
{
ex.printStackTrace();
int a = 5/0; //ArithmeticException
}
finally
{
System.out.println("Phrase 3 is over");
}
}
}
throw声明异常(checked exception)
public class ThrowsDemo
{
public static void main(String [] args)
{
try
{
int result = new Test().divide( 3, 1 );
System.out.println("the 1st result is" + result );
}
catch(ArithmeticException ex)
{
ex.printStackTrace();
}
int result = new Test().divide( 3, 0 );
System.out.println("the 2nd result is" + result );
}
}
class Test
{
//ArithmeticException is a RuntimeException, not checked exception
public int divide(int x, int y) throws ArithmeticException
{
int result = x/y;
return x/y;
}
}
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