find min in array java

                                    public static double arrayMax(double[] arr) {
    double max = Double.NEGATIVE_INFINITY;

    for(double cur: arr)
        max = Math.max(max, cur);

    return max;
}

                                    import java.util.Random;

public class Main {

public static void main(String[] args) {
   int a[] = new int [100];
   Random rnd = new Random ();

    for (int i = 0; i< a.length; i++) {
        a[i] = rnd.nextInt(99-0)+0;
        System.out.println(a[i]);
    }

    int max = 0;          

    for (int i = 0; i < a.length; i++) {
        a[i] = max;


        for (int j = i+1; j<a.length; j++) {
            if (a[j] > max) {
               max = a[j];
            }

        }
    }

    System.out.println("Max element: " + max);
}
}

                                     Scanner input = new Scanner(System.in);
        // Minimum And Maximum 
        int count = 0;
        int min = 0;
        int max = 0;
        boolean bugSolved = true;
		/* or we can use :
        int min = Integer.MAX_VALUE;
        int max = Integer.MIN_VALUE;
        */
		
        while (true){
            int cnt = count++;
            System.out.print("Enter Number #"+(cnt+1)+": ");
            boolean isValid = input.hasNextInt();
            if(isValid){
               int num = input.nextInt();
               /* if (bugSolved){
                   bugSolved = false;
                   min = num;
                   max = num;
               }  # Just remove this condition and 
               	boolean (bugSolved) at the top, if you use 
               	int min = Integer.MAX_VALUE and int max = 
                Integer.MIN_VALUE */
                if (num < min) {
                    min = num;
                }else if (num > max){
                    max = num;
                }
            }else{
                System.out.println("Invalid input..");
                break;
            }
            input.nextLine();
        }
        System.out.println("Min Number : " + min);
        System.out.println("Max Number : " + max);

                                    package com.concerned.crossbill;

import java.util.Arrays;

public class Foo {

  public int getMin(int[] numbers) {
	return Arrays.stream(numbers).min().getAsInt();
  }
}
// test class
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import com.concerned.crossbill.Foo;

public class FooTest { 
  public void testGetMin() {
    int[] numbers =  new int[]{12, 10, 31, 30, 23, 4, 5, 5, 5, 5, 10, 40};
    
    Foo foo = new Foo();
    int result  = foo.getMin(numbers);
    int expResult  = 4;
    
    assertEquals(expResult, result);
  }
}