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DuplicateNumber.java

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import java.util.*;

class DuplicateNumber{

public int findDuplicateNumber(List<Integer> number){

int highestNumber =number.size()-1;

int total=getSum(number);

int duplicate =total - (highestNumber*(highestNumber+1)/2);

return duplicate;

}

public int getSum(List<Integer> number){

int sum=0;

for(int num : number){

sum +=num;

}

return sum;

}

public static void main(String[] agrs){

List<Integer> li= new ArrayList<>();

for(int i=1;i<30;i++){

li.add(i);

}

DuplicateNumber dpl =new DuplicateNumber();

//add duplicate numbers

li.add(20);

System.out.println("duplicate number:"+dpl.findDuplicateNumber(li));

}

}