在我的扫描仪上找不到符号

Question

尝试创建一个程序，允许您输入相框和图片的长度/宽度，然后比较两者以查看一个是否适合另一个。简单的东西，因为我是 Java 新手，但我离题了 - 这是代码：

import java.util.Scanner;

public class pictureFrame {
   public static void main(String[] args) {
      double x = 0;
      double y = 0;
      double u = 0;
      double v = 0;

      xScanner = new Scanner(System.in);
      yScanner = new Scanner(System.in);
      uScanner = new Scanner(System.in);
      vScanner = new Scanner(System.in);

      System.out.println("Enter the length of the picture");
      x = xScanner.nextDouble();
      System.out.println("Enter the width of the picture");
      y = yScanner.nextDouble();
      System.out.println("Enter the length of the frame");
      u = uScanner.nextDouble();
      System.out.println("Enter the width of the frame");
      v = vScanner.nextDouble();

      if (x = u && y = v)
      {
        System.out.println("The frame fits the picture!");
      }
        else if (x == v && y == u) 
        {
            System.out.println("The frame fits the picture!");
        } 
               else 
              {
                  System.out.println("The frame does not fit the picture");
              }

         }

     }
     }

我收到了 8 个错误，都说他们找不到以下每一行的第一个字符的符号：

  xScanner = new Scanner(System.in);
  yScanner = new Scanner(System.in);
  uScanner = new Scanner(System.in);
  vScanner = new Scanner(System.in);
  x = xScanner.nextDouble();
  y = yScanner.nextDouble();
  u = uScanner.nextDouble();
  v = vScanner.nextDouble();

对不起，如果这个问题很愚蠢，我确实事先使用了搜索功能。

Answer 1

你忘了把 Scanner 放在语句前面，也..你只需要声明一次 Scanner：

Scanner scan = new Scanner(System.in);
x = scan.nextDouble();
y = scan.nextDouble();
//etc..