尝试捕捉本地化变量

Question

运行下面的代码时出现编译错误。在try-catch块之后的if语句中，编译器无法“解析为变量”。不过，我已经初始化了这些变量。任何帮助将非常感激。

public void Load(UniversityListing uListing, StudentBody sBody) { 

    try { 
     FileInputStream fIn1= new FileInputStream(filename1); 
     BufferedReader bufferedReader1 = new BufferedReader(new InputStreamReader(fIn1)); 
     existence1 = true; 

    }catch(FileNotFoundException ex){ 
     System.out.println("Unable to open file '" + filename1 +"'"); 
     existence1 = false; 
    }catch(IOException ex){ 
     System.out.println("Error reading file '" + filename1+ "'"); 
     existence1 = false; 
    } 


    if (existence1 == true){ 
     LoadUListing(uListing, bufferedReader1,fIn1); 
    } 
} 

Answer 1

当你在声明和初始化FIN1和bufferedReader1 try块内，他们将无法访问外尝试。

尝试改变如下：

public void Load(UniversityListing uListing, StudentBody sBody) { 
    BufferedReader bufferedReader1 = null; 
    FileInputStream fIn1 = null; 
    try { 
     fIn1 = new FileInputStream(filename1); 
     bufferedReader1 = new BufferedReader(new InputStreamReader(fIn1)); 
     existence1 = true; 

    } catch (FileNotFoundException ex) { 
     System.out.println("Unable to open file '" + filename1 + "'"); 
     existence1 = false; 
    } catch (IOException ex) { 
     System.out.println("Error reading file '" + filename1 + "'"); 
     existence1 = false; 
    } 


    if (existence1 == true) { 
     LoadUListing(uListing, bufferedReader1, fIn1); 
    } 
}