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Java Program to find Second Largest Number in an Array

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robaa
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2022-11-12
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We can find the second largest number in an array in java by sorting the array and returning the 2nd largest number. 

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robaa
2022-11-12
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public class SecondLargestInArrayExample{  
public static int getSecondLargest(int[] a, int total){  
int temp;  
for (int i = 0; i < total; i++)   
        {  
            for (int j = i + 1; j < total; j++)   
            {  
                if (a[i] > a[j])   
                {  
                    temp = a[i];  
                    a[i] = a[j];  
                    a[j] = temp;  
                }  
            }  
        }  
       return a[total-2];  
}  
public static void main(String args[]){  
int a[]={1,2,5,6,3,2};  
int b[]={44,66,99,77,33,22,55};  
System.out.println("Second Largest: "+getSecondLargest(a,6));  
System.out.println("Second Largest: "+getSecondLargest(b,7));  
}}

 

Output:

Second Largest: 5
Second Largest: 77

 

Find 2nd Largest Number in Array using Arrays

Let's see another example to get second largest element or number in java array using collections.

import java.util.Arrays;  
public class SecondLargestInArrayExample1{  
public static int getSecondLargest(int[] a, int total){  
Arrays.sort(a);  
return a[total-2];  
}  
public static void main(String args[]){  
int a[]={1,2,5,6,3,2};  
int b[]={44,66,99,77,33,22,55};  
System.out.println("Second Largest: "+getSecondLargest(a,6));  
System.out.println("Second Largest: "+getSecondLargest(b,7));  
}}

 

Output:

Second Largest: 5
Second Largest: 77

 

Find 2nd Largest Number in Array using Collections

Let's see another example to get second largest number in java array using collections.

import java.util.*;  
public class SecondLargestInArrayExample2{  
public static int getSecondLargest(Integer[] a, int total){  
List<Integer> list=Arrays.asList(a);  
Collections.sort(list);  
int element=list.get(total-2);  
return element;  
}  
public static void main(String args[]){  
Integer a[]={1,2,5,6,3,2};  
Integer b[]={44,66,99,77,33,22,55};  
System.out.println("Second Largest: "+getSecondLargest(a,6));  
System.out.println("Second Largest: "+getSecondLargest(b,7));  
}}

 

Output:

Second Largest: 5
Second Largest: 77

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