Sắp xếp mảng tăng dần

array

import java.util.*;
class Array
{
    public static void main(String[] args)
    {
        int n,i,j;
        int a[];
        Scanner input=new Scanner(System.in);
        System.out.print("Nhap vao so phan tu mang: ");
        n=input.nextInt();
        a=new int[n];
        for (i=0;i<n;i++)
            {
                System.out.print("a["+i+"]= ");
                a[i]=input.nextInt();
            }
        System.out.print("Cac phan tu cua mang da nhap la: ");
        for (i=0;i<n;i++)
            {
                System.out.print(a[i]+" ");
            }
        System.out.println(" ");
        for (i=0;i<n-1;i++)
            for (j=i+1;j<n;j++)
            {
                if (a[i]>a[j])
                {
                int tg=a[i];
                a[i]=a[j];
                a[j]=tg;
                }
            }
        System.out.print("Mang da nhap lai la: ");
        for (i=0;i<n;i++)
            {
                System.out.print(a[i]+" ");
            }
        System.out.println(" ");
    }
}