Re-input in Java is divided into 3 steps: create a Scanner object, clear the buffer (scanner.nextLine()), and wait for new input (scanner.nextLine()). Use the appropriate Scanner method to read data based on the input type (e.g., nextLine(), nextInt()).
Re-enter in Java
How to re-enter the content in a Java program?
In Java, you can use the Scanner
class to read user input from the console. Re-entering involves clearing previously entered data and waiting for new input.
Steps:
Create Scanner
Object:
Scanner scanner = new Scanner(System.in);
Read previous input (optional):
String previousInput = scanner.nextLine();
Clear buffer:
scanner.nextLine(); // 清除先前输入
Wait for new input:
String newInput = scanner.nextLine();
Code example:
import java.util.Scanner; public class ReInputExample { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("Enter your name:"); String name = scanner.nextLine(); // 清除缓冲区 scanner.nextLine(); System.out.println("Enter your age:"); int age = scanner.nextInt(); // 打印结果 System.out.println("Name: " + name); System.out.println("Age: " + age); } }
Note Things to note:
Scanner
method based on the input type (e.g., nextLine()
, nextInt()
). nextInt()
or nextDouble()
instead of nextLine()
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