--> Java User Input (Scanner)
Java User Input
The Scanner
class is used to get user input, and it is found in the java.util
package.
To use the Scanner
class, create an object of the class and use any of the available methods found in the Scanner
class documentation. In our example, we will use the nextLine()
method, which is used to read Strings:
Example
import java.util.Scanner; // Import the Scanner class
class MyClass {
public static void main(String[] args) {
Scanner myObj = new Scanner(System.in); // Create a Scanner object
System.out.println("Enter username");
String userName = myObj.nextLine(); // Read user input
System.out.println("Username is: " + userName); // Output user input
}
}
Input Types
In the example above, we used the nextLine()
method, which is used to read Strings. To read other types, look at the table below:
Method
Description
nextBoolean()
Reads a boolean
value from the user
nextByte()
Reads a byte
value from the user
nextDouble()
Reads a double
value from the user
nextFloat()
Reads a float
value from the user
nextInt()
Reads a int
value from the user
nextLine()
Reads a String
value from the user
nextLong()
Reads a long
value from the user
nextShort()
Reads a short
value from the user
In the example below, we use different methods to read data of various types:
Example
import java.util.Scanner;
class MyClass {
public static void main(String[] args) {
Scanner myObj = new Scanner(System.in);
System.out.println("Enter name, age and salary");
// String input
String name = myObj.nextLine();
// Numerical input
int age = myObj.nextInt();
double salary = myObj.nextDouble();
// Output input by user
System.out.println("Name: " + name);
System.out.println("Age: " + age);
System.out.println("Salary: " + salary);
}
}
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