Asterisk Replaces Vowel

Given a sentence the task is to replace every vowel in that sentence with Asterisks (*).

Example: Consider an sentence “Lorem Ipsum is simply dummy text of the printing and typesetting industry”. The program outputs “L*r*m *ps*m *s s*mply d*mmy t*xt *f th* pr*nt*ng *nd typ*s*tt*ng *nd*stry”.

Java
import java.util.*;
public class StarReplaceVowel
{
    public static void main(String Args[])
    {
        String str="",nstr="";
        int l=0;
        char ch=' ';
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter a string: ");
        str=sc.nextLine();
        str=str.trim();
        l=str.length();
        for(int i=0;i<l;i++)
        {
            ch=str.charAt(i);
            if(ch=='A'||ch=='E'||ch=='I'||ch=='O'||ch=='U'||ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u')
            {
                nstr=nstr+'*';
            }
            else
            {
                nstr=nstr+ch;
            }
        }
        System.out.print("New string: "+nstr);
    }
}
Java