Question

How to find the second largest element in an array with Java

Answer 1

public class MyClass {
    public static Integer getTheSecondlargest(int[] arr) { 
        Integer max = Integer.MIN_VALUE, secondmax = Integer.MIN_VALUE;
  
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] > max) {
                secondmax = max;
                max = arr[i]; 
            } else if (arr[i] < max && arr[i] > secondmax) {
                secondmax = arr[i]; 
            }
        }
        return secondmax;
    }
    public static void main(String args[]) {
        int[] arr1 = {34, 3, 8, 2, 9, 4, 6};
        System.out.println(getTheSecondlargest(arr1));
        
        int[] arr2 = {1, 1, 2, 1, 1};
        System.out.println(getTheSecondlargest(arr2));
        
        int[] arr3 = {5, 5, 5, 5, 5, 5, 5};
        System.out.println(getTheSecondlargest(arr3));
    }
}


    
      
      
/*
run:
      
9
1
-2147483648
      
*/

 

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Answer 2

import java.util.Arrays;  

public class MyClass {
    public static void main(String args[]) {
        int[] arr1 = {34, 3, 8, 2, 9, 4, 6};
        Arrays.sort(arr1);  
        System.out.println(arr1[arr1.length - 2]);
        
        int[] arr2 = {1, 1, 2, 1, 1};
        Arrays.sort(arr2);  
        System.out.println(arr2[arr2.length - 2]);
        
        int[] arr3 = {5, 5, 5, 5, 5, 5, 5};
        Arrays.sort(arr3);  
        System.out.println(arr3[arr3.length - 2]);
    }
}


    
      
      
/*
run:
      
9
1
5
      
*/

 

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