Sir Can you help me my code is giving error

#1

import java.util.Scanner;

public class BuildBSTQue {
public class Node{
int data;
Node left;
Node right;
}
private Node root;
public BuildBSTQue(int[] arr) {
this.root=construct(arr,0,arr.length-1);
}

private Node construct(int[] arr, int lo, int hi) {
	if(lo>hi) {
		return null;
	}
	int mid=(lo+hi)/2;
	Node nn=new Node();
	nn.data=arr[mid];
	nn.left=construct(arr,lo,mid-1);
	nn.right=construct(arr,mid+1,hi);
	return nn;
}
public void preOrder() {
	this.preOrder(this.root);
}
private void preOrder(Node node) {
	if(node==null) {
		return;
	}
	System.out.print(node.data+" ");
	preOrder(node.left);
	preOrder(node.right);
}

public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	int test = s.nextInt();
	while(test>0) {
		int length = s.nextInt();
		int [] myArray = new int[length];
		 for(int i=0; i<length; i++ ) {
	         myArray[i] = s.nextInt();
	      }
		BuildBSTQue bst=new BuildBSTQue(myArray);
		bst.preOrder();
	test--;
	}
	
}

}

#2

@karamjitverma89
your code is running just fine

import java.util.Scanner;

public class BuildBSTQue {
public class Node{
int data;
Node left;
Node right;
Node(int d){
this.data=d;
left=null;
right=null;
}
}
private Node root;
public BuildBSTQue(int[] arr) {
this.root=construct(arr,0,arr.length-1);
}

private Node construct(int[] arr, int lo, int hi) {
if(lo>hi) {
return null;
}
int mid=(lo+hi)/2;
Node nn=new Node(arr[mid]);

nn.left=construct(arr,lo,mid-1);
nn.right=construct(arr,mid+1,hi);
return nn;

}
public void preOrder() {
this.preOrder(this.root);
}
private void preOrder(Node node) {
if(node==null) {
return;
}
System.out.print(node.data+" ");
preOrder(node.left);
preOrder(node.right);
}

public static void main(String[] args) {
Scanner s = new Scanner(System.in);
int test = s.nextInt();
while(test>0) {
int length = s.nextInt();
int [] myArray = new int[length];
for(int i=0; i<length; i++ ) {
myArray[i] = s.nextInt();
}
BuildBSTQue bst=new BuildBSTQue(myArray);
bst.preOrder();
test–;
}

}
}

#3

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