# Java Program to Implement Bubble Sort algorithm

#### In this example, we will learn to execute bubble sort algorithm in Java.

## Example: Java Program to Implement Bubble Sort Algorithm

```
// import the Class
import java.util.Arrays;
import java.util.Scanner;
class Main{
// create an object of scanner
// to take input from the user
Scanner input = new Scanner(System.in);
// method to perform bubble sort
void bubbleSort(int array[]){
int size = array.length;
// for ascending or descending sort
System.out.println("Choose Sorting Order:");
System.out.println("1 for Ascending n2 for Descending");
int sortOrder = input.nextInt();
// run loops two times
// first loop access each element of the array
for (int i = 0; i < size - 1; i++)
// second loop performs the comparison in each iteration
for (int j = 0; j < size - i - 1; j++)
// sort the array in ascending order
if (sortOrder == 1) {
// compares the adjacent element
if (array[j] > array[j + 1]) {
// swap if left element is greater than right
int temp = array[j];
array[j] = array[j + 1];
array[j + 1] = temp;
}
}
// sort the array in descending order
else {
// compares the adjacent element
if (array[j] < array[j + 1]) {
// swap if left element is smaller than right
int temp = array[j];
array[j] = array[j + 1];
array[j + 1] = temp;
}
}
}
// driver code
public static void main(String args[]){
// create an array
int[] data = { -2, 45, 0, 11, -9 };
// create an object of Main class
Main bs = new Main();
// call the method bubbleSort using object bs
// pass the array as the method argument
bs.bubbleSort(data);
System.out.println("Sorted Array in Ascending Order:");
// call toString() of Arrays class
// to convert data into the string
System.out.println(Arrays.toString(data));
}
}
```

**Output 1**

Choose Sorting Order: 1 for Ascending 2 for Descending 1 Sorted Array: [-9, -2, 0, 11, 45]

In this case, we have entered **1** as input. Hence, the program sort the array in ascending order.

**Output 2**

Choose Sorting Order: 1 for Ascending 2 for Descending 2 Sorted Array: [45, 11, 0, -2, -9]

In this case, we have entered **2** as input. Hence, the program sort the array in descending order.

# Python Example for Beginners

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