java - 是否可以声明 Supplier<T> 需要抛出异常？

Question

所以我正在尝试重构以下代码:

/**
 * Returns the duration from the config file.
 * 
 * @return  The duration.
 */
private Duration durationFromConfig() {
    try {
        return durationFromConfigInner();
    } catch (IOException ex) {
        throw new IllegalStateException("The config file (\"" + configFile + "\") has not been found.");
    }
}

/**
 * Returns the duration from the config file.
 * 
 * Searches the log file for the first line indicating the config entry for this instance.
 * 
 * @return  The duration.
 * @throws FileNotFoundException If the config file has not been found.
 */
private Duration durationFromConfigInner() throws IOException {
    String entryKey = subClass.getSimpleName();
    configLastModified = Files.getLastModifiedTime(configFile);
    String entryValue = ConfigFileUtils.readFileEntry(configFile, entryKey);
    return Duration.of(entryValue);
}

我想出了以下开始:

private <T> T getFromConfig(final Supplier<T> supplier) {
    try {
        return supplier.get();
    } catch (IOException ex) {
        throw new IllegalStateException("The config file (\"" + configFile + "\") has not been found.");
    }
}

但是，它不能编译(显然)，因为 Supplier 不能抛出 IOException。 有什么方法我可以将它添加到 getFromConfig 的方法声明中吗？

或者是像下面这样的唯一方法？

@FunctionalInterface
public interface SupplierWithIO<T> extends Supplier<T> {
    @Override
    @Deprecated
    default public T get() {
        throw new UnsupportedOperationException();
    }

    public T getWithIO() throws IOException;
}

更新，我刚刚意识到 Supplier 接口(interface)是一个真正简单的接口(interface)，因为它只有 get( ) 方法。我扩展 Supplier 的最初原因是为了破坏基本功能，例如默认方法。

Answer 1

编辑

正如多次指出的那样，您不需要任何自定义类，请改用 Callable 和 Runnable

错误、过时的解决方案

Consider this generic solution:

// We need to describe supplier which can throw exceptions
@FunctionalInterface
public interface ThrowingSupplier<T> {
    T get() throws Exception;
}

// Now, wrapper
private <T> T callMethod(ThrowingSupplier<T> supplier) {
    try {
        return supplier.get();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
        return null;
}

// And usage example
String methodThrowsException(String a, String b, String c) throws Exception {
    // do something
}

String result = callMethod(() -> methodThrowsException(x, y, z));