Calculate the year quarter difference in java -


i have use case , have provide input start quarter , end quarter 2 input string. example provide 201501(start quarter) , 201602(end quarter) 2 quarter input. method give output in map previous start quarter , end quarter following previous start quarter 201303 previous end quarter 201404 ie first quarter difference between 2 time period calculated. previous last quarter 1 quarter previous input start quarter , quarter difference between 2 input derived , subtracted previous last quarter previous start quarter.

public static map<string,string> getpreviousquarter( string  start,string end){      string prevstartquarter=    calulatepreviousquarter(start);     string prevendquarter=calulatepreviousquarter(end);     map<string,string> returnmap = new hashmap<string,string>();     returnmap.put("previousstartquarter", prevstartquarter);     returnmap.put("previousendquarter",prevendquarter);     system.out.println("the reurnmap is" +returnmap);     return returnmap;      }          private static string calulatepreviousquarter(string input)         {             int yearval=0;              string year = input.substring(0,4);             string quarter = input.substring(4);             if(quarter.equalsignorecase("01"))             {                  yearval =  integer.valueof(year)-1;                  quarter ="04";             }             else             {                 yearval = integer.valueof(year);                 switch(quarter)                 {                 case "02":                     quarter ="01";                       break;                 case "03":                     quarter ="02";                       break;                 case "04":                     quarter ="03";                       break;                     default:                         break;                  }             }              return string.valueof(yearval)+quarter;         }

inputoutput input string start 201501 string end 201602 quarter difference 6 expected output map key,values previousstartquarter 201404 previousendquarter 201303

the following code should looking for:

public static map<string, string> getpreviousquarter(string start,         string end) {     string prevstartquarter = calulatepreviousquarter(start);     string prevendquarter = calulatepreviousquarter(end);     int len=1;     while(!start.equals(prevendquarter)){         prevendquarter=calulatepreviousquarter(prevendquarter);         len++;     }     string tmp=prevstartquarter;     for(int i=0;i<len;i++){         tmp=calulatepreviousquarter(tmp);     }     map<string, string> returnmap = new hashmap<string, string>();     returnmap.put("previousstartquarter", prevstartquarter);     returnmap.put("previousendquarter", tmp);     system.out.println("the reurnmap is" + returnmap);     return returnmap;  }  private static string calulatepreviousquarter(string input) {     int yearval = 0;      string year = input.substring(0, 4);     string quarter = input.substring(4);     if (quarter.equalsignorecase("01")) {         yearval = integer.valueof(year) - 1;         quarter = "04";     } else {         yearval = integer.valueof(year);         switch (quarter) {         case "02":             quarter = "01";             break;         case "03":             quarter = "02";             break;         case "04":             quarter = "03";             break;         default:             break;          }     }      return string.valueof(yearval) + quarter; }

i hope helps.


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