diff --git a/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java b/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
index a184b71..e775591 100644
--- a/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
+++ b/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
@@ -14,12 +14,10 @@
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main_java);
 
-        findViewById(R.id.flowable_btn).setOnClickListener(view -> {
-            rxProcess.flowableReactiveStreams();
-        });
+        findViewById(R.id.flowable_btn).setOnClickListener(view -> rxProcess.flowableReactiveStreams());
 
-        findViewById(R.id.observable_btn).setOnClickListener(view -> {
-            rxProcess.observable();
-        });
+        findViewById(R.id.observable_btn).setOnClickListener(view -> rxProcess.observable());
+
+        findViewById(R.id.just_btn).setOnClickListener(view -> rxProcess.just());
     }
 }