The following code will sort the array in ascending order :

Question

int a[] = {30,7,9,20};
Arrays.sort(a);
System.out.println(Arrays.toString(a));
How i sort in Descending order ?

Answer 1

@prashant this is because the method you are using only support wrapper classes. this is the reason.

Answer 2

import java.util.Arrays;//you need to import arrays
public class Program
{
public static void main(String [] args)
int [] a = {30,7,9,20};//wrong array define
Arrays.sort(a);
for(int i=0;i<a.length;i++)
System.out.println(a[i]);
}
}

Answer 3

here is desc code
import java.util.Arrays;
public class Program
{
public static void main(String [] args)
{
int [] a = {30,7,9,20};
for(int i=0;i<a.length;i++)
System.out.println(Arrays.toString(a));
for(int i=0;i<a.length;i++)
System.out.println(a[i]);
}
}

Answer 4

I finally did it:)
import java.util.Arrays;
import java.util.Collections;
public class Main {
public static void main(String[] args) {
Integer[] a = new Integer[] {
new Integer(30),
new Integer(7),
new Integer(9),
new Integer(20)
};
Arrays.sort(a, Collections.reverseOrder());
for (Integer i : a) {
System.out.println(i.intValue());
}
}
}
ıt cannot sort arrays of primitives this is why ı used integer :)

Answer 5

do this...
Integer[] a =new Integer[]{30,7,9,20};
Arrays.sort(a, Collections.reverseOrder());

Answer 6

@farshaad heydari
I want use int not Integer

Answer 7

@Alihan Demir
you code is for ascending order not for descending order

Answer 8

again wrong code and wrong output @ Alihan

Answer 9

thanx , I know that we can't sort array of ing type but we can sort other primitive type of array .
I was searching why we can't sort int type only

Answer 10

sorry for answering to late ....,
so if u want to sort an array of int s(primitives). u could use the selection sort or insertion sort algorithm.
but if you are very beginner in Java u might have some troubles to understand an write them(like me!)