Feat: add static analytic of code

src/main/java/com/sheepit/client/exception/SheepItExceptionServerOverloaded.java

@@ -26,15 +26,15 @@ public class SheepItExceptionServerOverloaded extends SheepItExceptionWithRequir
 		super();
 	}
 	
-	public SheepItExceptionServerOverloaded(String message_) {
-		super(message_);
+	public SheepItExceptionServerOverloaded(String message) {
+		super(message);
 	}
 	
-	public String getHumanText() {
+	@Override public String getHumanText() {
 		return "The server is overloaded and cannot allocate a job. Will try again at %tR";
 	}
 	
-	public int getWaitDuration() {
+	@Override public int getWaitDuration() {
 		return 1000 * 60 * ThreadLocalRandom.current().nextInt(10, 30 + 1);
 	}
 }