Java How to Program, Early Objects, 11th Edition

... constructor uses parameter names identical to
18      // instance variable names the "this" reference is
19      // required to distinguish between the names
20      public SimpleTime(int hour, int minute, int second) {
21         this.hour = hour; // set "this" object’s hour
22         this.minute = minute; // set "this" object’s minute
23         this.second = second; // set "this" object’s second
24      }
25
26      // use explicit and implicit "this" to call toUniversalString
27      public String buildString() {
28         return String.format("%24s: %s%n%24s: %s",
29            "this.toUniversalString()", this.toUniversalString(),
30            "toUniversalString()", toUniversalString());
31      }
32
33      // convert to String in universal-time format (HH:MM:SS)
34      public String toUniversalString() {
35         // "this" is not required here to ...