Java-Sort-Algorithms/MergeSort.java at master · mattryanmtl/Java-Sort-Algorithms · GitHub

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importjava.io.BufferedReader;

importjava.io.InputStreamReader;

importjava.util.Arrays;


publicclassMergeSort {

// Function to merge the two sorted arrays

staticvoidmerge(int[] array,intlow,intmid,inthigh){

inti,j,k;

int[] c= newint[high-low+1];

k = 0;

i=low;

j=mid+1;

while(i<=mid && j<=high){

if(array[i]<=array[j]){

c[k++] = array[i++];

 }

else{

c[k++] = array[j++];

 }

 }

while(i<=mid){

c[k++] = array[i++];

 }

while(j<=high){

c[k++] = array[j++];

 }

k=0;

for(i = low; i<=high; i++){

array[i] = c[k++];

 }

 }

// Function implementing the merge sort

staticvoidmergeSort(int[] array,intlow, inthigh){

if(high-low+1>1){

intmid = (low+high)/2;

mergeSort(array,low,mid);

mergeSort(array,mid+1,high);

merge(array,low,mid,high);

 }

 }

// Function to read the input and display the output

publicstaticvoidmain(String[] args) {

BufferedReaderbr = newBufferedReader(newInputStreamReader(System.in));

intsize;

System.out.println("Enter the size of the array");

try {

size = Integer.parseInt(br.readLine());

 } catch (Exceptione) {

System.out.println("Invalid Input");

return;

 }

int[] array = newint[size];

System.out.println("Enter array elements");

inti;

for (i = 0; i < array.length; i++) {

try {

array[i] = Integer.parseInt(br.readLine());

 } catch (Exceptione) {

System.out.println("An error Occurred");

 }

 }

System.out.println("The initial array is");

System.out.println(Arrays.toString(array));

mergeSort(array,0,array.length-1);

System.out.println("The sorted array is");

System.out.println(Arrays.toString(array));

 }

}