What is the nextInt() Method in Java?
Example 1
Let’s take our first dive to the basic example.import java.util.Scanner;
public class TestIntInput {
public static void checkInt(String testData) {
System.out.println(testData);
Scanner scanner = new Scanner(testData);
while (scanner.hasNext()) {
if (scanner.hasNextInt()) {
// calling the nextInt() method
System.out.println(scanner.nextInt() + "\t\t INT FOUND!");
} else {
System.out.println(scanner.next() + "\t\t");
}
}
scanner.close();
System.out.println();
}
public static void main(String[] args) {
String testData1 = "My 3 years old cat Diana, just gave birth to 5 healthy babies.";
String testData2 = "The number 1 place to learn Java is CodeGym!";
String testData3 = "6; 5 4 3. 2 1 !";
checkInt(testData1);
checkInt(testData2);
checkInt(testData3);
}
}
Output
My 3 years old cat Diana, just gave birth to 5 healthy babies.
My
3 INT FOUND!
years
old
cat
Diana,
just
gave
birth
to
5 INT FOUND!
healthy
babies.
The number 1 place to learn Java is CodeGym!
The
number
1 INT FOUND!
place
to
learn
Java
is
CodeGym!
6; 5 4 3. 2 1 !
6;
5 INT FOUND!
4 INT FOUND!
3.
2 INT FOUND!
1 INT FOUND!
!
Explanation
One thing to note in the above example in testData3 is that a number needs to be space-separated to be scanned as an individual int. That’s the reason why 6 and 3 are not identified as integers because they are colon and comma-separated respectively.Example 2
This example uses the System input to scan it as integers.import java.util.Scanner;
public class TestSystemInput {
public static void getFinalExamScore() {
System.out.println("Get Your Final Exam Score!\n");
int finalScore = 0;
int totalCourses = 0;
Scanner scanner = new Scanner(System.in);
System.out.println("Enter total Courses: ");
totalCourses = scanner.nextInt();
for (int i = 0; i < totalCourses; i++) {
System.out.println("Enter score in course " + (i + 1) + " : ");
finalScore = finalScore + scanner.nextInt();
}
System.out.println("Your final Score = " + finalScore);
scanner.close();
}
public static void main(String[] args) {
getFinalExamScore();
}
}
Output
Get Your Final Exam Score!
Enter total Courses:
3
Enter score in course 1 :
10
Enter score in course 2 :
15
Enter score in course 3 :
15
Your final Score = 40