動力節點小編告訴大家，在Java中接受鍵盤輸入是使用 Scanner 對象完成的。

考慮以下陳述

Scanner console = new Scanner(System.in)

該語句聲明了一個名為 console 的引用變量。Scanner 對象與標準輸入設備 (System.in) 相關聯。

要從鍵盤獲取輸入，您可以調用 Scanner 類的方法。例如在以下語句中 Scanner 的 nextInt() 方法接受一個整數并返回變量 x ：

int x = console.nextInt();

例子 ：

import java.util.Scanner;    // Needed for Scanner class
/**
 *  This program demonstrates keyboard input.
 */
public class RectangleArea
{
   public static void main(String[] args)
   {
      int length;    // To hold rectangle's length.
      int width;     // To hold rectangle's width.
      int area;      // To hold rectangle's area
      // Create a Scanner object to read input.
      Scanner console = new Scanner(System.in);
      // Get length from the user.
      System.out.print("Enter length ");
      length = console.nextInt();
      // Get width from the user.
      System.out.print("Enter width ");
      width = console.nextInt();
      // Calculate area.
      area = length * width;
      // Display area.
      System.out.println("The area of rectangle is " + area);
   }
}

輸出 ：

輸入長度5
輸入寬度8
矩形的面積是40

Scanner 類的其他一些有用的方法

例子 ：

import java.util.Scanner;
/**
 * This program demonstrates various Scanner methods.
 */
public class ReadEmployee
{
    public static void main(String[] args)
    {
        String name; // To hold the employee's name
        int age; // To hold the employee's age
        char gender; // To hold the employee's gender
        double salary; // To hold the employee's salary
        // Create a Scanner object to read input.
        Scanner console = new Scanner(System.in);
        // Get the employee's name
        System.out.print("Enter name: ");
        name = console.nextLine();
        // Get the employee's age
        System.out.print("Enter age: ");
        age = console.nextInt();
        // Get the employee's gender
        System.out.print("Enter gender: ");
        gender = console.next().charAt(0);
        // Get the employee's salary
        System.out.print("Enter salary: ");
        salary = console.nextDouble();
        // Display the information
        System.out.println("Name: " + name + " Age: " + age + " Gender: "
                + gender + " Salary: " + salary);
    }
}

輸出 ：

輸入姓名：Alex Joseph
輸入年齡：24
輸入性別：M
輸入薪水：8000
姓名：Alex Joseph 年齡：24 性別：M 薪水：8000.0