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sort items in an array

Posted on 2003-12-07
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Last Modified: 2010-03-31
hi all.
I have an array , and I want to sort 3 items in that array(known values) in accending order without disterbing the others.for example if my array is
 { 1, 2, 20, 90, 30, 130, 10, 190 ,52 }
I want to sort three items contain 10, 20, 30 so the output would be
{ 1, 2, 10, 90, 20, 130, 30, 190 ,52 }. It sounds easy but I couldn't get it right.This is what I have done
 public static void main(String[] args)
    {
        int[]num = { 1, 2, 20, 90, 30, 130, 10, 190 ,52 };
        int temp;
        for(int i =0; i<num.length; i++)
        {
              if (num[i] == 10)
              {
                    temp = num[i];
                    for (int j=0; j<num.length; j++)
                    {
                          if (num[j] == 20)
                          {
                                num[i] = num[j];
                          
                                num[j] = temp;
                           }
                          if (i == j)
                          num[i] = num[j];
                    }
              }
        }
        for (int i =0; i<num.length; i++)
        System.out.print (num[i] + " ");                        
    }  
}It doesn't do any thing good
Pease , anyone can show me a good way to dothis.
thank
0
Comment
Question by:vnhenry
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5 Comments
 
LVL 86

Expert Comment

by:CEHJ
Comment Utility
Something like:

  static void sort() {
    int[] num = { 1, 2, 20, 90, 30, 130, 10, 190 ,52 };
    int firstN = 3; //sort first n items
    int temp;
    for(int i = 0; i < num.length; i++) {
      for(int j = 0;j < firstN;j++) {
        if (num[i] < num[j]) {
          temp = num[j];
          num[j] = num[i];
          num[i] = temp;
        }
      }
    }
    for(int i = 0;i < num.length;i++) {
      System.out.println(num[i]);
    }
  }
0
 

Author Comment

by:vnhenry
Comment Utility
I dont really get it CEHJ.
what I want to do here is given 3 items in the array which their value is 10 20 and 30.
I dont know index of there 3 numbers.
I need  to swap there 3 item so they will be sorted in order 10 befor 20 befor 30 without messing up these other items in the array
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LVL 86

Accepted Solution

by:
CEHJ earned 50 total points
Comment Utility
Sorry - thought you wanted just the first 3 sorted. Not particularly pretty, but works:

 static void sort() {
    int[] num = {1, 2, 20, 90, 30, 130, 10, 190, 52};
    //sort first n items
    int temp;
    for (int i = num.length - 1; i > 0; i--) {
      for (int j = 0; j < i; j++) {
        if ((num[i] == 10 || num[i] == 20 || num[i] == 30) && (num[j] == 10 || num[j] == 20 || num[j] == 30)) {
          if (num[i] < num[j]) {
            temp = num[j];
            num[j] = num[i];
            num[i] = temp;
          }
        }
      }
    }
    for (int i = 0; i < num.length; i++) {
      System.out.println(num[i]);
    }
  }
0
 

Author Comment

by:vnhenry
Comment Utility
Unbelievable!
 I Wish I have some of your talent, CEHJ
Thank you so much.

Best regard.
0
 
LVL 86

Expert Comment

by:CEHJ
Comment Utility
8-)

You could parameterize the target numbers by passing an array of target int, creating a Set of Integer and calling another function like

boolean isTargetNumber() {}
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