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什么时候使用assert()，什么时候使用try catch？

发布于 2024-10-05 13:19:01 字数 19 浏览 4 评论 0原文

您在哪些情况下使用它们？

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风和你 2024-10-12 13:19:02

try-catch和assert的情况完全不同。
断言用于检查您收到的值（例如作为参数）是否符合预期。我不建议在生产代码中使用断言，它主要用于单元测试，很少用于检查参数。
要更好地检查传递的值，请使用以下内容：

public void test(int i) {
  if (i < 0) {
    throw new IllegalArgumentException("i cannot be less than 0");
  }
  ...
}

当您知道块内的某些内容可能会出错时，请使用 Try-catch 块。例如，您向SD卡写入数据，但没有空间可写入。或者，您碰巧尝试超出数组范围来读取数组。然后，将关键代码放入 try-catch 块中并检查异常：

try {
  InputStream is = new FileInputStream("filename.txt");
  ...
} catch FileNotFoundExcpetion {
  System.out.println("file not found");
} finally {
 ...
}

更多关于异常和 try-catch 块。

The situations of try-catch and assert are totally different.
Assert is used to check if the value you have received, as parameter for example, is expected. I would not recommend to use assert in production code, it is used in unit-test mostly and rarely to check the parameters.
To check the passed values better to use something like:

public void test(int i) {
  if (i < 0) {
    throw new IllegalArgumentException("i cannot be less than 0");
  }
  ...
}

Try-catch block is used when you know something inside the block can go wrong. For example, you write to an sdcard and there is no space for writing. Or, it happened that you try to read the array out of it bounds. Then, you put your critical code in try-catch block and check for the excpetions:

try {
  InputStream is = new FileInputStream("filename.txt");
  ...
} catch FileNotFoundExcpetion {
  System.out.println("file not found");
} finally {
 ...
}

More about exceptions and try-catch blocks.

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