How to re-enter in java

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:

1. Create Scanner Object:

   Scanner scanner = new Scanner(System.in);

2. Read previous input (optional):

   String previousInput = scanner.nextLine();

3. Clear buffer:

   scanner.nextLine(); // 清除先前输入

4. 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:

• Make sure you clear the buffer before retyping.
• Use the appropriate Scanner method based on the input type (e.g., nextLine(), nextInt()).
• For numeric input, be sure to use methods such as nextInt() or nextDouble() instead of nextLine().

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