﻿ Java - All even numbers come before odd numbers in an array

# Java: Rearrange all the elements of an given array of integers so that all the odd numbers come before all the even numbers

## Java Basic: Exercise-94 with Solution

Write a Java program to rearrange all the elements of an given array of integers so that all the odd numbers come before all the even numbers.

Pictorial Presentation:

Sample Solution:

Java Code:

``````import java.util.*;

public class Exercise94 {
public static void main(String[] args) {
// Define an array of integers
int[] array_nums = {1, 7, 8, 5, 7, 13, 0, 2, 4, 9};

// Initialize an index variable to track even numbers
int i = 0;

// Display the original array
System.out.println("Original Array: " + Arrays.toString(array_nums));

// Find the first odd number's index (i)
while (i < array_nums.length && array_nums[i] % 2 == 0)
i++;

// Rearrange the array such that odd numbers come after even numbers
for (int j = i + 1; j < array_nums.length; j++) {
if (array_nums[j] % 2 != 0) {
// Swap even and odd numbers
int temp = array_nums[i];
array_nums[i] = array_nums[j];
array_nums[j] = temp;
i++;
}
}

// Display the modified array
System.out.println("New Array: " + Arrays.toString(array_nums));
}
}
```
```

Sample Output:

```Original Array: [1, 7, 8, 5, 7, 13, 0, 2, 4, 9]
New Array: [7, 5, 7, 13, 9, 1, 0, 2, 4, 8]
```

Flowchart:

Java Code Editor:

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