How to take input in this question

#1 
public static void main(String[] args) {
	// TODO Auto-generated method stub
 BST t=new BST();
 Scanner sc=new Scanner(System.in);
 int test=sc.nextInt();
 while(test!=0) {
	 int n=sc.nextInt();
 int ar[]=new int[n];
 for(int i=0;i<n;i++) {
	 ar[i]=sc.nextInt();
 }
 Arrays.sort(ar);
 t.constract(ar);
 int m=sc.nextInt();
 int arr[]=new int[m];
 for(int j=0;j<m;j++) {
	 arr[j]=sc.nextInt();
 }
 for(int i=0;i<m;i++) {
	 t.delete(arr[i]);
 }
 t.preOrder();
 System.out.println();
 test--;
}
}

this is right or wrong if wrong then tell me how take input

#2

@sksumitkumardiwaker,
Don’t sort the array before construction.

For construction use something like this:

construct(int val, node nn){
	if (nn == null) {
		Node nk = new Node();
		nk.data = val;
		root = nk;
		return;
	}
	if (nn.data > val) {
		if (nn.left != null) {
			add(val, nn.left);
		} else {
			Node nk = new Node();
			nk.data = val;
			nn.left = nk;
			return;
		}
	} else if (nn.data < val) {
       complete this on your own....
  }}
#3

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