﻿ Java exercises: Find maximum difference between two elements in a given array of integers such that smaller element appears before larger element - w3resource # Java Array Exercises: Find maximum difference between two elements in a given array of integers such that smaller element appears before larger element

## Java Array: Exercise-65 with Solution

Write a Java program to find maximum difference between two elements in a given array of integers such that smaller element appears before larger element.

Example:
Input :
nums = { 2, 3, 1, 7, 9, 5, 11, 3, 5 }
Output:
The maximum difference between two elements of the said array elements
10

Sample Solution:

Java Code:

``````import java.util.Arrays;
class solution
{
public static int diff_between_two_elemnts(int[] nums)
{
int diff_two_elemnts = Integer.MIN_VALUE;

for (int i = 0; i < nums.length - 1; i++) {
for (int j = i + 1; j < nums.length; j++) {
diff_two_elemnts = Integer.max(diff_two_elemnts,nums[j] - nums[i]);
}
}

return diff_two_elemnts;
}

public static void main(String[] args)
{
int[] nums = { 2, 3, 1, 7, 9, 5, 11, 3, 5 };
System.out.println("\nOriginal array: "+Arrays.toString(nums));

System.out.print("The maximum difference between two elements of the said array elements\n" + diff_between_two_elemnts(nums));
}
}
```
```

Sample Output:

```Original array: [2, 3, 1, 7, 9, 5, 11, 3, 5]
The maximum difference between two elements of the said array elements
10
```

Flowchart: Java Code Editor:

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## Java: Tips of the Day

Array vs ArrayLists:

The main difference between these two is that an Array is of fixed size so once you have created an Array you cannot change it but the ArrayList is not of fixed size. You can create instances of ArrayLists without specifying its size. So if you create such instances of an ArrayList without specifying its size Java will create an instance of an ArrayList of default size.

Once an ArrayList is full it re-sizes itself. In fact, an ArrayList is internally supported by an array. So when an ArrayList is resized it will slow down its performance a bit as the contents of the old Array must be copied to a new Array.

At the same time, it's compulsory to specify the size of an Array directly or indirectly while creating it. And also Arrays can store both primitives and objects while ArrayLists only can store objects.

Ref: https://bit.ly/3o8L2KH