java遗珠之多异常

Posted 2022-12-07 吴冬冬

catch可以同时捕获多个异常，示例如下：

    public void writeList() 
        // The FileWriter constructor throws IOException, which must be caught.
        PrintWriter out = null;
        try 
            System.out.println("Entered try statement");
            out = new PrintWriter(new FileWriter("OutFile.txt"));
            for (int i = 0; i < SIZE; i++) 
                // The get(int) method throws IndexOutOfBoundsException, which must be caught.
                out.println("Value at: " + i + " = " + list.get(i));
            
            out.close();
         catch (IOException  | IndexOutOfBoundsException e) 
        	//ERROR e=new IOException("new io exception");
            e.printStackTrace();
        

    

但要注意的是如果是捕获多异常的话，异常变量默认就会变成final的了，不能再进行赋值。

单个异常不是final的

        catch (IOException  e) 
            e=new IOException("new io exception");
            e.printStackTrace();