Thread: array bubble sort

hello
Okay, with this bit of code im working on listing a disorganized double array into ascending order. I used an example from my text book to run organize using bubble sort. Only issue is that when the computer prints out disorganized, it returns as [D@42e816

import java.util.*;
public class SortDoubles
{
public static void main(String[] args)
{
double[] disorganized = {0.19, 5.16, 45, 4.5, 32, 23.1, 6.52, 41, 15.3, 3.69, 12.35, 80, 62.2, 81.5, 75.6};
double temp;
int a;
int b;


a = disorganized.length;

for(b = 0; b < (a - 1); ++b)
{
temp = disorganized[b];
disorganized[b] = disorganized[b + 1];
disorganized[b + 1] = temp;
}
System.out.print(disorganized[]);
}
}

Im still new to this. as Im reading my code Im thinking I need to include an if statement to check then switch the two numbers around inside of the for loop

Your code won't compile.

If you use the name of an array in a print or println statement, it prints something about the array and a hashcode that is important to Java and to certain debuggers, but fairly meaningless to "normal" programs and "normal" programmers.

If you want an easy to print the contents of an array, you can use the Arrays Class static "toString" method:

    System.out.println("Plain vanilla disorganized   : " + disorganized);
    System.out.println("Arrays.toString(disorganized): " + Arrays.toString(disorganized));

Output

Plain vanilla disorganized   : [D@e53108
Arrays.toString(disorganized): [5.16, 45.0, 4.5, 32.0, 23.1, 6.52, 41.0, 15.3, 3.69, 12.35, 80.0, 62.2, 81.5, 75.6, 0.19]

Reference: Java Arrays Class


Of course you can do it with individual print statements in a loop if you want some control over formatting of the output (one array element per line, for example).

Anyhow, whatever method you use to show the contents, you can now proceed with debugging the sort functionality.


Cheers!

Z

huzzah!!! I got it working. I just sat here and really stared at it for a while. then I ran into the problem of this just going through the list once and it would print.
Posting this in case anyone else can use this to help em out.

import java.util.*;
public class SortDoubles
{
public static void main(String[] args)
{
double[] disorganized = {0.19, 5.16, 45, 4.5, 32, 23.1, 6.52, 41, 15.3, 3.69, 12.35, 80, 62.2, 81.5, 75.6};
double temp;
int a;
int b;
int c;


a = disorganized.length;
for(b = 0; b < (a - 1); ++b)
for(c = 0; c < (a - 1); ++c)
if(disorganized[c] > disorganized[c + 1])
{
temp = disorganized[c];
disorganized[c] = disorganized[c + 1];
disorganized[c + 1] = temp;
}
for(b = 0; b < (a - 1); ++b)
System.out.print(disorganized[b] + ", ");
}
}

huzzah!!! I got it working. I just sat here and really stared at it for a while. then I ran into the problem of this just going through the list once and it would print.
Posting this in case anyone else can use this to help em out.

import java.util.*;
public class SortDoubles
{
public static void main(String[] args)
{
double[] disorganized = {0.19, 5.16, 45, 4.5, 32, 23.1, 6.52, 41, 15.3, 3.69, 12.35, 80, 62.2, 81.5, 75.6};
double temp;
int a;
int b;
int c;


a = disorganized.length;
for(b = 0; b < (a - 1); ++b)
for(c = 0; c < (a - 1); ++c)
if(disorganized[c] > disorganized[c + 1])
{
temp = disorganized[c];
disorganized[c] = disorganized[c + 1];
disorganized[c + 1] = temp;
}
for(b = 0; b < (a - 1); ++b)
System.out.print(disorganized[b] + ", ");
}
}