Lesson: 04 | Max Integer

Codes

public class MaxIntegerFinder {
    
    public static Integer findMaxInteger(List<Integer> integerList) {
        if (integerList == null || integerList.isEmpty()) {
            throw new IllegalArgumentException('The list cannot be null or empty');
        }
        
        Integer maxInteger = integerList.get(0);
        
        for (Integer i = 1; i < integerList.size(); i++) {
            if (integerList.get(i) > maxInteger) {
                maxInteger = integerList.get(i);
            }
        }
        
        return maxInteger;
    }
}

Test Class

@isTest
public class MaxIntegerFinderTest {
    
    @isTest
    static void testFindMaxInteger() {
        List<Integer> intList = new List<Integer>{5, 4, 3, 2, 8};
        Integer maxInteger = MaxIntegerFinder.findMaxInteger(intList);
        System.assertEquals(8, maxInteger);
    }
}

Video