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Wednesday, 21 January 2015

Generate Combination in java

public class Combination {
     void doCombination(char []str,int start,int end){   
     char []data=new char[3];
     int i=0;
     int r=3;// how many element combine in one selection
     doCombinationUntil(str,data,start,end,i,r);
     }
    
   void   doCombinationUntil(char []str,char []data,int start,int end,int index,int r){
        if (index==r) {
          for (int j = 0; j < r; j++) {
              System.out.print(data[j]);
          }
          System.out.println("");
          return;
     }
        for (int i=start; i<=end && end-i+1 >= r-index; i++)
         {
             data[index] = str[i];
             doCombinationUntil(str, data, i+1, end, index+1, r);
         }
     }
    
     public static void main(String[] args) {  
          String str1="abcd";
          char []str=str1.toCharArray();
          Combination obj=new Combination();
          obj.doCombination(str,0,(str.length-1));
     }
    

}



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