# Lambda
## throw IOException
```
import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.util.function.Consumer;
@FunctionalInterface
public interface ThrowingConsumer extends Consumer {
@Override
default void accept(final T elem) {
try {
acceptThrows(elem);
} catch (final Exception e) {
// Implement your own exception handling logic here..
// For example:
// System.out.println("handling an exception...");
// Or ...
throw new RuntimeException(e);
}
}
void acceptThrows(T elem) throws Exception;
}
void main(String[] args) throws IOException {
FileSystem fileSystem = FileSystems.getDefault();
System.out.printf("%30s | %10s | %23s | %20s \n", "", "Type", "Total space", "Free space");
System.out.println("-------------------------------------------------"
+ "----------------------------------------------------------");
Iterable fileStores = fileSystem.getFileStores();
// for (var fileStore : fileStores) {
// System.out.printf("%30s | %10s | %20s GB | %20s GB\n", fileStore, fileStore.type(),
// (fileStore.getTotalSpace() / 1073741824f),
// (fileStore.getUsableSpace() / 1073741824f));
// }
fileStores.forEach((ThrowingConsumer) fileStore -> {
System.out.printf("%30s | %10s | %20s GB | %20s GB\n", fileStore, fileStore.type(),
(fileStore.getTotalSpace() / 1073741824f),
(fileStore.getUsableSpace() / 1073741824f));
});
}
//class MyConsumer implements Consumer
//{
//
// @Override
// public void accept(FileStore fileStore) throws IOException {
// System.out.printf("%30s | %10s | %20s GB | %20s GB\n", fileStore, fileStore.type(),
// (fileStore.getTotalSpace() / 1073741824f),
// (fileStore.getUsableSpace() / 1073741824f));
// }
//}
```