Solved

sort items in an array

Posted on 2003-12-07
5
265 Views
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
  • 3
  • 2
5 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 9892087
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
ID: 9892373
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
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 50 total points
ID: 9892435
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
ID: 9892554
Unbelievable!
 I Wish I have some of your talent, CEHJ
Thank you so much.

Best regard.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 9892614
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() {}
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

For customizing the look of your lightweight component and making it look lucid like it was made of glass. Or: how to make your component more Apple-ish ;) This tip assumes your component to be of rectangular shape and completely opaque. (COD…
An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question