A simple game in JAVA

simpleGame.java

@@ -0,0 +1,60 @@
+package simplegame;
+import java.util.Scanner;
+
+/
+public class SimpleGame {
+
+	/**
+	 * @param seconds to convert
+	 * @return string for the converted seconds in the format: 23:59:59
+	 */
+	public String convertTime(int seconds){
+		// TODO: Your code goes here
+		if(seconds>=0){
+		String a =  Integer.toString(seconds/3600)+":"+Integer.toString((seconds/60)%60)+":"+Integer.toString(seconds%60);
+		System.out.println(a);
+		return a;
+		}if(seconds<0){
+			String b = "-1:-1:-1";
+			System.out.println(b);
+			return b;
+		}
+
+		return null;
+	}
+
+	/**
+	 * @param integer to add digits
+	 * @return integer in which all the digits in the given non-negative integer are added.
+	 * 
+	 */
+	public int digitsSum(int input){
+		// TODO: Your code goes here
+		int sum =0;
+		for (int i=0;input>0;i++){
+			sum +=input%10;
+			input=input/10;
+		}System.out.println(sum);
+		return sum;
+	}
+
+	public static void main(String[] args) {
+
+		SimpleGame game = new SimpleGame();
+		Scanner sc = new Scanner(System.in);
+
+		System.out.println("Game type convertTime[1] and digitsSum[2]: ");
+		int u = sc.nextInt();
+		if (u==1){
+			System.out.println("Enter time in seconds: ");
+			int u2 = sc.nextInt();
+			String time = game.convertTime(u2);
+		}if (u==2){
+			System.out.println("Enter number : ");
+			int u3 =sc.nextInt();
+			int sum = game.digitsSum(u3);
+		}
+
+		sc.close();
+	}	
+}