Java representing time class -

i want represent time time class. can't use , set methods.only can use listed methods on code.but doesn't work. returns 0:0:0.

 public int addhours(int hours)       {           if(hours>=0&&hours<=23)           {                 return hours;           }           return 0;       }       public int addminutes(int minutes)       {           if(minutes>=0&&minutes<=59)           {               return minutes;           }         return 0;         }       public int addseconds(int seconds)       {           if(seconds>=0&&seconds<=59)           {               return seconds;           }       return 0;       }       public string showtime()       {         return hours+":"+minutes+":"+seconds;       } } 

your code nothing.

you need this:

public void addhours( int hours ){    this.hours += hours; // add hours    this.hours %= 24; // roll on @ 24 hours }  public void addminutes( int minutes ){     this.minutes += minutes; // add minutes     addhours(this.minutes/60); // carry on hours     this.minutes %= 60; // roll on @ 60 minutes }  public void addseconds( int seconds ){     this.seconds += seconds; // add seconds     addminutes(seconds/60); // carry on minutes     this.seconds %= 60; // roll on @ 60 seconds } 

(it won't matter, not thread safe @ all)

but bad idea. java 8 has beautiful time api, pre java-8 there jodatime library (which basis of java 8 time api). seems want benefit localtime:

localtime t = localtime.of(13,50,27).addhours(1).addminutes(1).addseconds(1);  system.out.println(t.tostring());   // prints 14:51:28