Searching and sorting algorithms operations - Mutithreading in Java

Multithreading.java

package Multithreading;

import java.util.Scanner;

class MyThread extends Thread{
	
	private int[] arr;
	
	MyThread(int[] arr){
		this.arr = arr;
	}
	
	// 8 4 2
	public void run(){
		
		System.out.println("(From child thread) :=> Starting sorting process!");

		// selection sort
		for(int i=0;i<arr.length-1;i++){
			int min = i;
			for(int k=i+1;k<arr.length;k++){
				if(arr[k]<arr[min]){
					min = k;
				}
			}			
			int temp = arr[min];
			arr[min]= arr[i];
			arr[i]=temp;
		}
		
		System.out.println("(From child thread) :=> Done sorting");
	}
		
}

class Search extends Thread{
	
	private int[] arr;
	private int val;
	
	Search(int[] a,int val){
		this.arr = a;
		this.val = val;
	}
	
	public void run(){
		
		System.out.println("(From child thread) :=> Starting searching process!");
		
		// binary search	
		int low = 0;
		int high = arr.length-1;
		
		while(low<=high){
			
			int mid = (low+high)/2;
			
			if(arr[mid] == val){
				System.out.println("Element found at index :" + mid);
				return;
			}else if(arr[mid] > val){
				high = mid - 1;
			}else{
				low = mid + 1;
			}
		}
		
		System.out.println("Element not found!");
		System.out.println("(From child thread) :=> Done searching");
	}
}

public class MultiThreading {	
	
	// helper method to print arr elements
	public static void display(int[] a){
		for(int i=0;i<a.length;i++){
			System.out.println(a[i]);
		}
	}
	
	public static void main(String[] args) throws InterruptedException{
			
		Scanner s = new Scanner(System.in);
		
		System.out.println("Enter number of integers u want to sort :");
		int n = s.nextInt();
		
		int[] arr = new int[n];
		
		// user input
		for(int i=0;i<n;i++){
			arr[i]=s.nextInt();
		}
		
		System.out.println("Entered numbers are :");
		display(arr);
		
		// creating child thread
		MyThread m = new MyThread(arr);
		m.start();
		
		// waiting for child thread to complete
		m.join();
		
		System.out.println("Sorted  numbers are :");
		display(arr);
		
		System.out.println("Enter number to search:");
		int value = s.nextInt();
		
		Search ns = new Search(arr,value);
		ns.start();
		
		// waiting for child thread to complete
		ns.join();
		
		System.out.println("Exiting main thread!");
		
		
	}
	
}