java sort function ?

[Zerg]

let's say i have an array of integer.
is there any java sort function so that i can call something like this ?

java.xxx.sort(myIntegerArray)

and it returns me an sorted integer array ??

thanks

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[kannanbalu]

Try the foll:

int[] x = {5, 2, 7, 9, 3};
com.sun.rmi.io.util.Arrays.sort(x);
for (int i = 0; i < x.length; i++)
{
System.out.println("element no. " + (i + 1) + " = " + x[i]);
}

Kannan

[weaver]

I couldn't find that class, but the following should work:

int[] x = {5, 2, 7, 9, 3};
java.util.Arrays.sort(x);
for (int i = 0; i < x.length; i++) {
System.out.println("element no. " + (i + 1) + " = " + x);
}

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[Zerg]

thanks kannan and weaver.
that's indeed a great help.

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[Zerg]

this is holy ****!
i am using JDK1.1.8
i can't use java.util.Arrays.sort

any other solution ?
pls help me

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[weaver]

I'm sorry, I've never actually seen JDK1.1.8. I'm using 1.2 right now.

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icq# 64665116
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[poochi]

I have copied someof the sourcecode from java.util.Arrays class and have created a class called "Arrays". Give a look at it. You can use this "Arrays" class in your code.


public class sortEx{
public static void main( String[] str ){
int[] intArray = { 4, 2 , 12 , 5 , 3 , 4 , 10 };
Arrays.sort( intArray );
for( int index = 0 ; index < intArray.length ; index++ ){
System.out.println( intArray[index] );
}
}

}

class Arrays{
public static void sort(int[] a) {
sort1(a, 0, a.length);
}

private static void sort1(int x[], int off, int len) {
// Insertion sort on smallest arrays
if (len < 7) {
for (int i=off; i<len+off; i++)
for (int j=i; j>off && x[j-1]>x[j]; j--)
swap(x, j, j-1);
return;
}

// Choose a partition element, v
int m = off + len/2; // Small arrays, middle element
if (len > 7) {
int l = off;
int n = off + len - 1;
if (len > 40) { // Big arrays, pseudomedian of 9
int s = len/8;
l = med3(x, l, l+s, l+2*s);
m = med3(x, m-s, m, m+s);
n = med3(x, n-2*s, n-s, n);
}
m = med3(x, l, m, n); // Mid-size, med of 3
}
int v = x[m];

// Establish Invariant: v* (<v)* (>v)* v*
int a = off, bb = a, c = off + len - 1, d = c;
while(true) {
while (bb <= c && x[bb] <= v) {
if (x[bb] == v)
swap(x, a++, bb);
bb++;
}
while (c >= bb && x[c] >= v) {
if (x[c] == v)
swap(x, c, d--);
c--;
}
if (bb > c)
break;
swap(x, bb++, c--);
}

// Swap partition elements back to middle
int s, n = off + len;
s = Math.min(a-off, bb-a ); vecswap(x, off, bb-s, s);
s = Math.min(d-c, n-d-1); vecswap(x, bb, n-s, s);

// Recursively sort non-partition-elements
if ((s = bb-a) > 1)
sort1(x, off, s);
if ((s = d-c) > 1)
sort1(x, n-s, s);

}

private static void swap(int x[], int a, int bb) {
int t = x[a];
x[a] = x[bb];
x[bb] = t;
}

private static int med3(int x[], int a, int bb, int c) {
return (x[a] < x[bb] ?
(x[bb] < x[c] ? bb : x[a] < x[c] ? c : a) :
(x[bb] > x[c] ? bb : x[a] > x[c] ? c : a));
}

private static void vecswap(int x[], int a, int b, int n) {
for (int i=0; i<n; i++, a++, b++)
swap(x, a, b);
}

}

[rameshlkr]

use CompareTo() method & StringTokenizer

How about sorting Strings instead of Numbers? Did anyone do so?

Thanks.