[Java] Rename java ObjectRef/ActorHandle (#8799)

java/tutorial/src/main/java/io/ray/exercise/Exercise01.java

@@ -1,7 +1,7 @@
 package io.ray.exercise;
 
+import io.ray.api.ObjectRef;
 import io.ray.api.Ray;
-import io.ray.api.RayObject;
 import java.io.Serializable;
 
 /**
@@ -29,8 +29,8 @@ public class Exercise01 implements Serializable {
       // Use `Ray.init` to initialize the Ray runtime.
       Ray.init();
       // Use `Ray.call` to call a remote function.
-      RayObject<String> hello = Ray.call(Exercise01::sayHello);
-      RayObject<String> world = Ray.call(Exercise01::sayWorld);
+      ObjectRef<String> hello = Ray.call(Exercise01::sayHello);
+      ObjectRef<String> world = Ray.call(Exercise01::sayWorld);
       System.out.println("First remote call result:" + hello.get());
       System.out.println("Second remote call result:" + world.get());
     } catch (Throwable t) {

java/tutorial/src/main/java/io/ray/exercise/Exercise02.java

@@ -1,7 +1,7 @@
 package io.ray.exercise;
 
+import io.ray.api.ObjectRef;
 import io.ray.api.Ray;
-import io.ray.api.RayObject;
 
 /**
  * Execute remote functions in parallel with some dependencies.
@@ -28,8 +28,8 @@ public class Exercise02 {
   }
 
   public static String sayHelloWorld() {
-    RayObject<String> hello = Ray.call(Exercise02::sayHello);
-    RayObject<String> world = Ray.call(Exercise02::sayWorld);
+    ObjectRef<String> hello = Ray.call(Exercise02::sayHello);
+    ObjectRef<String> world = Ray.call(Exercise02::sayWorld);
     // Pass unfinished results as the parameters to another remote function.
     return Ray.call(Exercise02::merge, hello, world).get();
   }

java/tutorial/src/main/java/io/ray/exercise/Exercise03.java

@@ -1,7 +1,7 @@
 package io.ray.exercise;
 
+import io.ray.api.ObjectRef;
 import io.ray.api.Ray;
-import io.ray.api.RayObject;
 
 /**
  * Call a remote function from within another remote function.
@@ -14,7 +14,7 @@ public class Exercise03 {
   public static String sayHelloWithWorld() {
     String ret = "hello";
     System.out.println(ret);
-    RayObject<String> world = Ray.call(Exercise03::sayWorld);
+    ObjectRef<String> world = Ray.call(Exercise03::sayWorld);
     return ret + "," + world.get();
   }
 

java/tutorial/src/main/java/io/ray/exercise/Exercise04.java

@@ -1,8 +1,8 @@
 package io.ray.exercise;
 
 import com.google.common.collect.ImmutableList;
+import io.ray.api.ObjectRef;
 import io.ray.api.Ray;
-import io.ray.api.RayObject;
 import io.ray.api.WaitResult;
 import java.util.List;
 
@@ -38,7 +38,7 @@ public class Exercise04 {
   public static void main(String[] args) throws Exception {
     try {
       Ray.init();
-      List<RayObject<String>> waitList = ImmutableList.of(
+      List<ObjectRef<String>> waitList = ImmutableList.of(
           Ray.call(Exercise04::f1),
           Ray.call(Exercise04::f2),
           Ray.call(Exercise04::f3)

java/tutorial/src/main/java/io/ray/exercise/Exercise05.java

@@ -1,8 +1,8 @@
 package io.ray.exercise;
 
+import io.ray.api.ActorHandle;
+import io.ray.api.ObjectRef;
 import io.ray.api.Ray;
-import io.ray.api.RayActor;
-import io.ray.api.RayObject;
 
 /**
  * Show usage of actors.
@@ -13,11 +13,11 @@ public class Exercise05 {
     try {
       Ray.init();
       // `Ray.createActor` creates an actor instance.
-      RayActor<Adder> adder = Ray.createActor(Adder::new, 0);
+      ActorHandle<Adder> adder = Ray.createActor(Adder::new, 0);
       // Use `Ray.call(actor, parameters)` to call an actor method.
-      RayObject<Integer> result1 = adder.call(Adder::add, 1);
+      ObjectRef<Integer> result1 = adder.call(Adder::add, 1);
       System.out.println(result1.get());
-      RayObject<Integer> result2 = adder.call(Adder::add, 10);
+      ObjectRef<Integer> result2 = adder.call(Adder::add, 10);
       System.out.println(result2.get());
     } catch (Throwable t) {
       t.printStackTrace();