如何在Java中将用户输入分配给变量？我应该用扫描仪吗？[副本]

Question

我对Java完全陌生，这是我用Java语言尝试的第一个程序。我在谷歌上搜索了一下，但似乎找不到一个可以理解的解释，说明如何使用scanner将用户输入分配给变量。我不完全确定扫描仪是什么，这可能是问题的一部分。

我已经阅读了这里的文档(http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html). 它谈论了很多关于reg-ex的事情，我不需要它，这让我觉得我可能找错了方向。任何帮助都将不胜感激，谢谢！

import java.util.*;

public final class Chapter_02 {
    public static void main(String[] args) {
        //Declare variables to be used (Height, Width, and Area)
        double length;
        double width;
        double area;

        //User input of length and width
        System.out.print("Please input the length of the property in feet:");
        width = ;
        System.out.print("Please input the length of the property in feet:");
        length = ;

        //Calculate area based on user input
        //Divide by number of feet in one acre
        area = (length * width) / 43560;

        //Additional spacing for readability
        System.out.println();
        System.out.println();

        //Post calculation result
        System.out.println("The property is " + area + " acres!");
    }
}    

Answer 1

是，您可以使用扫描仪或控制台：

Console console = System.console();
String inputWidth = console.readLine("Please input the length of the property in feet:");

然后将字符串转换为双精度：

double width = Double.parseDouble(inputWidth);

Answer 2

试着穿上这件性感的衣服：

Scanner scan = new Scanner(System.in);

//User input of length and width
System.out.print("Please input the width of the property in feet:");
width = scan.nextDouble();
System.out.print("Please input the length of the property in feet:");
length = scan.nextDouble();