java下Scanner的小问题

请问如何将这段c的scanf语句转化为java下使用Scanner的语句:
C/C++ code:

int n = -1;
resultOfScanf = scanf("%d", &n);

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Java code:

public class InputTest {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
// String inputString = scanner.nextLine();
int i = Integer.parseInt(scanner.nextLine());
System.out.println(i);
// InputStreamReader reader = new InputStreamReader(System.in);
// BufferedReader buffReader = new BufferedReader(reader);
// String readerLine;
// try {
// readerLine = buffReader.readLine();
// System.out.println(readerLine);
// } catch (IOException e) {
// e.printStackTrace();
// }

}
}


//121(input)
//121(console)

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引用

int resultOfScanf  = new Scanner(System.in).nextInt();

up

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Scanner s = new Scanner(System.in);
int i = s.nextInt();

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请问这儿的n=-1是用来做什么的？

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import java.util.*;
class temp
{
public static void main(String[] args){
int resultOfScanf;