Java 算幾分鐘後的Class

 
public class MyTime {
 //final 靜態常數不會修改的
 public static final int HOURS_PER_DAY = 24;
 public static final int MINUTES_PER_HOUR = 60;
 
 private int mHour;
 private int mMinute;



public void setMytime(int inHour, int inMinute) {
  if( inHour < 0 && inHour >= HOURS_PER_DAY)
   return;
  
  if(inMinute < 0  && inMinute >= HOURS_PER_DAY)
   return;
  
  mHour = inHour;
  mMinute = inMinute;
 }


 public void passMinute(int inMinute) {  
  // (原本小時 + (分+傳入的分)/24小時的餘數)/24小時的餘數
  mHour = (mHour + (mMinute + inMinute) / MINUTES_PER_HOUR)
    % HOURS_PER_DAY;
  
  //(分+傳入的分)/60分的餘數
  mMinute = (mMinute + inMinute)%MINUTES_PER_HOUR;
 }


 public String toString() {  
  return (mHour >= 10 ? "": "0" )+ mHour + ":" + (mMinute >= 10 ? "" : "0") + mMinute;
 }

}

//呼叫方式

 
  MyTime mTime = new MyTime();
  mTime.setMytime(6, 30);
  System.out.println(mTime);
  mTime.setMytime(8, 50);
  System.out.println(mTime);
  mTime.passMinute(120);
  System.out.println(mTime.toString());