字段初始化中未处理的异常 [英] Unhandled exceptions in field initializations

问题描述

  public class MyClass 
 {
 //不能编译，因为构造函数可以抛出IOException 
 private static MyFileWriter x = new MyFileWriter（foo.txt）; 
 ... 
} 
  

或者做这些初始化总是必须移动转换成一个方法，我们可以声明 throws IOException 或将初始化包装在try-catch块中。

解决方案

使用静态初始化块

  public class MyClass 
 {
 private静态MyFileWriter x; 
 
 static {
 try {
 x = new MyFileWriter（foo.txt）; 
} catch（Exception e）{
 logging_and _stuff_you_might_want_to_terminate_the_app_here_blah（）; 
} // end try-catch 
} // end static init block 
 ... 
} 
  

Does Java have any syntax for managing exceptions that might be thrown when declaring and initializing a class's member variable?

public class MyClass
{
  // Doesn't compile because constructor can throw IOException
  private static MyFileWriter x = new MyFileWriter("foo.txt"); 
  ...
}

Or do such initializations always have to be moved into a method where we can declare throws IOException or wrap the initialization in a try-catch block?

解决方案

Use a static initialization block

public class MyClass
{
  private static MyFileWriter x;

  static {
    try {
      x = new MyFileWriter("foo.txt"); 
    } catch (Exception e) {
      logging_and _stuff_you_might_want_to_terminate_the_app_here_blah();
    } // end try-catch
  } // end static init block
  ...
}

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