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Сърдечно благодаря! А защо по този начин принтираме:

hours + " : " + minutes

Защо : е в кавички? И няма ли как без тези плюсове и кавичките да принтираме?

https://www.javatpoint.com/string-concatenation-in-java

1) String Concatenation by + (string concatenation) operator

Java string concatenation operator (+) is used to add strings. For Example:

class TestStringConcatenation1{  
 public static void main(String args[]){  
   String s="Sachin"+" Tendulkar";  
   System.out.println(s);//Sachin Tendulkar  
 }  
}  

In java, String concatenation is implemented through the StringBuilder (or StringBuffer) class and its append method. String concatenation operator produces a new string by appending the second operand onto the end of the first operand. The string concatenation operator can concat not only string but primitive values also. For Example:

class TestStringConcatenation2{  
 public static void main(String args[]){  
   String s=50+30+"Sachin"+40+40;  
   System.out.println(s);//80Sachin4040  
 }  
}  

2) String Concatenation by concat() method

The String concat() method concatenates the specified string to the end of current string. Syntax:

1. public String concat(String another)  

class TestStringConcatenation3{  
 public static void main(String args[]){  
   String s1="Sachin ";  
   String s2="Tendulkar";  
   String s3=s1.concat(s2);  
   System.out.println(s3);//Sachin Tendulkar  
  }  
}