如果抛出异常，Java 继续执行循环

Question

示例:假设我要打开一个文件。如果我收到 FileNotFoundException，我需要等待一段时间然后重试。我怎样才能优雅地做到这一点？或者我是否需要使用嵌套的 try/catch block ？

示例:

public void openFile() {
    File file = null; 
    try {
        file = new <....>
    } catch(FileNotFoundException e) {
    }
    return file;
}

Answer 1

您可以使用 do { ... } while (file == null) 构造。

File file = null; 

do {
    try {
        file = new <....>
    } catch(FileNotFoundException e) {
        // Wait for some time.
    }
} while (file == null);

return file;