How to get the input number in java

There are two ways to get input numbers in Java: use the Scanner class and call the nextInt() method to get the integer. Using the BufferedReader class, call the readLine() method to get a line of text and convert it to a number.

How to get the input number using Java

Use Scanner class

## The #Scanner class is a commonly used class in Java for getting input from the console. It provides a nextInt() method to get the integer entered by the user.

import java.util.Scanner;

public class InputNumber {

    public static void main(String[] args) {
        // 创建一个 Scanner 对象
        Scanner scanner = new Scanner(System.in);

        // 获取用户输入的数字
        System.out.print("请输入一个数字：");
        int number = scanner.nextInt();

        // 打印用户输入的数字
        System.out.println("你输入的数字是：" + number);

        // 关闭 Scanner 对象
        scanner.close();
    }
}

Using the BufferedReader class

The BufferedReader class can also be used to get input from the console. It provides a readLine() method to obtain a line of text entered by the user. We can use this text to parse numbers entered by the user.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class InputNumber {

    public static void main(String[] args) throws IOException {
        // 创建一个 BufferedReader 对象
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        // 获取用户输入的数字
        System.out.print("请输入一个数字：");
        String input = reader.readLine();

        // 解析用户输入的数字
        int number = Integer.parseInt(input);

        // 打印用户输入的数字
        System.out.println("你输入的数字是：" + number);

        // 关闭 BufferedReader 对象
        reader.close();
    }
}

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