How to check Missing and Repeated number in array

 A array size n have element 1-n but one element is missing and one element is repeated .
public class MissingAndRepeatedElement {
static void searchMissingAndRepeated(int []arr){
for (int i = 0; i < arr.length; i++) {
if (arr[Math.abs(arr[i])-1]>0) {
arr[Math.abs(arr[i])-1]=-arr[Math.abs(arr[i])-1];
}
else {
System.out.println(“reapted=”+Math.abs(arr[i-1]));
}
}
for (int j = 0; j < arr.length; j++) {
if (arr[j]>0) {
System.out.println(“Missing=”+(j+1));
}
}
}
public static void main(String[] args) {
int arr[]={7, 3,4, 5, 5, 6, 2};
searchMissingAndRepeated(arr);
}
}

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