Question

Example: say I want to open a file. If I get a FileNotFoundException, I need to wait for some time and try again. How can I gracefully do that? Or do I need to use nested try/catch blocks?

Example :

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

Answer 1

You could use a do { ... } while (file == null) construct.

File file = null; 

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

return file;