局部变量可能未被初始化 - 在方法中检测未检查的异常throw [英] The local variable might not have been initialized - Detect unchecked exception throw within a method

问题描述

我有一些这样的代码：

  public void method（）{
 Object o; 
 try {
 o = new Object（）; 
} catch（Exception e）{
 //处理，几行
 throw new Error（）; //我们自己的unchecked异常
} 
 doSomething（o）; 
} 
  

我有很多方法在catch中有相同的代码块，所以我想提取它到一个方法，以便我可以保存一些行。我的问题是，如果我这样做，我得到一个编译器错误
局部变量o可能没有被初始化。

  public void method（）{
 Object o; 
 try {
 o = new Object（）; 
} catch（Exception e）{
 handleError（）; 
} 
 // doSomething（o）;编译器错误
} 
 
 
 private void handleError（）throws Error {
 //处理几行
 throw new Error（）; 
} 
  

是否有任何解决方法？

  
 public void method（）{
 Object o = null; 
 try {
 o = new Object（）; 
} catch（Exception e）{
 handleError（）; 
} 
 doSomething（o）; 
} 
  

在使用未初始化的局部变量之前，不会得到编译失败

I have some code with this structure:

public void method() {
    Object o;
    try {
        o = new Object();
    } catch (Exception e) {
        //Processing, several lines
        throw new Error(); //Our own unchecked exception
    }
    doSomething(o);
}

I have quite a few methods in which I have the same code in the catch block, so I want to extract it to a method so that I can save some lines. My problem is, that if I do that, I get a compiler error " The local variable o might not have been initialized".

public void method() {
    Object o;
    try {
        o = new Object();
    } catch (Exception e) {
        handleError();
    }
    //doSomething(o); compiler error
}


private void handleError() throws Error {
    //Processing, several lines
    throw new Error();
}

Is there any workaround?

解决方案

You need to initialize local variables before they are used as below

public void method() {
    Object o=null;
    try {
        o = new Object();
    } catch (Exception e) {
        handleError();
    }
   doSomething(o); 
}

You will not get the compilation failure until you use local variable which was not initialized

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