diff --git a/.github/workflows/checkstyle.yml b/.github/workflows/checkstyle.yml
index f1a4dc45..383838e1 100644
--- a/.github/workflows/checkstyle.yml
+++ b/.github/workflows/checkstyle.yml
@@ -1,9 +1,9 @@
 name: Code Formatter
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
-  lint:
+  checkstyle:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index 1418aa04..4e646fd0 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -3,7 +3,7 @@
 
 name: Java CI with Gradle
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 967af3e5..63712cfe 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -3,7 +3,7 @@
 
 name: Java CI with Maven
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
diff --git a/.gitignore b/.gitignore
index 85543c50..5f62faa6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 .gradle
 /build/
 .idea/
+target
 
 # Ignore Gradle GUI config
 gradle-app.setting
diff --git a/src/main/java/com/examplehub/basics/ForLoop.java b/src/main/java/com/examplehub/basics/ForLoop.java
index 7a106b48..9f299b41 100644
--- a/src/main/java/com/examplehub/basics/ForLoop.java
+++ b/src/main/java/com/examplehub/basics/ForLoop.java
@@ -66,6 +66,32 @@ public static void main(String[] args) {
     }
     System.out.println("\n");
 
+    /*
+     * 1 2 3 4 5
+     */
+    int x = 0;
+    while (true) {
+      x++;
+      System.out.print(x + "");
+      if (x == 5) {
+        break;
+      }
+    }
+    System.out.println();
+
+    /*
+     * 1 2 3 4 5
+     */
+    int i = 0;
+    do {
+      i++;
+      System.out.print(i + "");
+      if (i == 5) {
+        break;
+      }
+    } while (true);
+    System.out.println();
+
     /* infinite loop */
     /*
     for (; ; ) {