```java
Amplify.DataStore.query(Post.class,
queryMatches -> {
if (queryMatches.hasNext()) {
Log.i("MyAmplifyApp", "Successful query, found posts.");
} else {
Log.i("MyAmplifyApp", "Successful query, but no posts.");
}
},
error -> Log.e("MyAmplifyApp", "Error retrieving posts", error)
);
```
```kotlin
Amplify.DataStore.query(Post::class.java,
{ matches ->
if (matches.hasNext()) {
Log.i("MyAmplifyApp", "Successful query, found posts.")
} else {
Log.i("MyAmplifyApp", "Successful query, but no posts.")
}
},
{ Log.e("MyAmplifyApp", "Error retrieving posts", it) }
)
```
```kotlin
Amplify.DataStore.query(Post::class)
.catch { Log.e("MyAmplifyApp", "Error retrieving posts", it) }
.collect { Log.i("MyAmplifyApp", "Post retrieved successfully") }
```
```java
RxAmplify.DataStore.query(Post.class).subscribe(
post -> Log.i("MyAmplifyApp", "Successful query, found post."),
error -> Log.e("MyAmplifyApp", "Error retrieving posts", error)
);
```