Feat: add static analytic of code

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

@@ -29,15 +29,15 @@ public class SheepItServerDown extends SheepItExceptionWithRequiredWait {
 		super();
 	}
 	
-	public SheepItServerDown(String message_) {
-		super(message_);
+	public SheepItServerDown(String message) {
+		super(message);
 	}
 	
-	public String getHumanText() {
+	@Override public String getHumanText() {
 		return "Cannot connect to the server. Please check your connectivity. Will try again at %tR";
 	}
 	
-	public int getWaitDuration() {
+	@Override public int getWaitDuration() {
 		return 1000 * 60 * ThreadLocalRandom.current().nextInt(10, 30 + 1);
 	}
 }