Java 如何压缩此代码

这是写这篇文章的好方法，还是有一个不太臃肿的表格可以使用

import java.util.Calendar;

public class Day {

    public static void main(String[] args){
        Calendar cal = Calendar.getInstance();
        System.out.println("Todays date is : " + cal.getTime());


//increment by one from current date

        int OneIncrementalDay = 1;
        cal.getTime();
        cal.add(Calendar.DATE,
               OneIncrementalDay);
        System.out.println("Tomorrows date is : " + cal.getTime());

//deduction by one from current date

       int OneDayDeducted = -1;
       cal.getTime();
       cal.add(Calendar.DATE,
               OneDayDeducted);
       System.out.println("Yesterdays date was : " + cal.getTime());
       cal.getTime();

//increment of 15 from current date 

       int FifteenDaysIncremental = 15;
       cal.getTime();
       cal.add(Calendar.DATE,
                FifteenDaysIncremental);
       System.out.println("15 days from the current"
               + " date is : " + cal.getTime());


    }
}

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是的，如果您使用的是java 8，则可以使用新的：

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还有一些方法可以加/减月、年等，对于可读性来说，你所拥有的是好的，但是如果你真的想缩小它，有一件事你可以做。由于三个块中的每个块除了值之外基本相同，因此将所有值放入长度为3的数组中，然后使用for循环适当地更改值，例如：

int[] increments = {1, -1, 15};
String[] text = {"Tomorrows date is : ",
                 "Yesterdays date was : ",
                 "15 days from the current date is : "};

for (int i = 0; i < increments.length; i++)
{
    cal.getTime();
    cal.add(Calendar.DATE, increments[i]);
    System.out.println(text[i] + cal.getTime());
}

int[]增量={1，-1,15}；
字符串[]text={“明天的日期是：”，
“昨天的日期是：”，
“从当前日期算起的15天为：”}；
对于（int i=0；i

如果我是这一款的程序员，我会这样做

  import java.util.Calendar;

    public class Day {
        Calendar cal = Calendar.getInstance();

    public Calendar inCrementNumberofDays(Integer day){
            cal.getTime();
            cal.add(Calendar.DATE,
                   day);
            return cal;        
    }

    public Calendar decrementNumberofDays(Integer day){
            day = day * -1;
            cal.getTime();
            cal.add(Calendar.DATE,
                   day);
            return cal;        
    }
     public static void main(String[] args){

            System.out.println("Todays date is : " + cal.getTime());

    //increment by one from current date
            cal = inCrementNumberofDays(1);
            System.out.println("Tomorrows date is : " + cal.getTime());

    //deduction by one from current date
           cal = decrementNumberofDays(1);
           System.out.println("Yesterdays date was : " + cal.getTime());

    //increment of 15 from current date 
           cal = inCrementNumberofDays(15);
           System.out.println("15 days from the current"
                   + " date is : " + cal.getTime());
        }
    }

---

考虑使用java 8的时间API或JoDA时间，两者都会减少代码量，这也可能更适合于

  import java.util.Calendar;

    public class Day {
        Calendar cal = Calendar.getInstance();

    public Calendar inCrementNumberofDays(Integer day){
            cal.getTime();
            cal.add(Calendar.DATE,
                   day);
            return cal;        
    }

    public Calendar decrementNumberofDays(Integer day){
            day = day * -1;
            cal.getTime();
            cal.add(Calendar.DATE,
                   day);
            return cal;        
    }
     public static void main(String[] args){

            System.out.println("Todays date is : " + cal.getTime());

    //increment by one from current date
            cal = inCrementNumberofDays(1);
            System.out.println("Tomorrows date is : " + cal.getTime());

    //deduction by one from current date
           cal = decrementNumberofDays(1);
           System.out.println("Yesterdays date was : " + cal.getTime());

    //increment of 15 from current date 
           cal = inCrementNumberofDays(15);
           System.out.println("15 days from the current"
                   + " date is : " + cal.getTime());
        }
    }