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# sort items in an array

Posted on 2003-12-07
Medium Priority
269 Views
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
Question by:vnhenry
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LVL 86

Expert Comment

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

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

CEHJ earned 200 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

ID: 9892554
Unbelievable!
I Wish I have some of your talent, CEHJ
Thank you so much.

Best regard.
0

LVL 86

Expert Comment

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

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