// Initializing array of integers 
        Integer[] num = { 2, 4, 7, 5, 9 }; 

  // using Collections.max() to find minimum element 
        // using only 1 line. 
int max = Collections.max(Arrays.asList(num)); 

You can simply used in-build java Collection and Arrays to sort out this problem. You just need to import them and use it.

Please check below code.

import java.util.Arrays;
import java.util.Collections;

public class getMinNMax {
    public static void main(String[] args) {

        Integer[] num = { 2, 11, 55, 99 };

        int min = Collections.min(Arrays.asList(num));
        int max = Collections.max(Arrays.asList(num));

        System.out.println("Minimum number of array is : " + min);
        System.out.println("Maximum number of array is : " + max);
    }
}

int[] convertedValues = new int[10];
int max = convertedValues[0];

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

Similarly find for the minimum value by changing lesser symbol.

you can try this -

class MaxNumber
{
    public static void main(String args[])
    {
        int[] a = new int[] { 10, 3, 50, 14, 7, 90};
        int max = a[0];
        for(int i = 1; i < a.length;i++)
        {
            if(a[i] > max)
            {
                max = a[i];
            }
        }

        System.out.println("Given Array is:");
        for(int i = 0; i < a.length;i++)
        {
            System.out.println(a[i]);
        }

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