为什么 BufferedImage 不被识别为有效符号？

问题描述

我正在尝试执行此处建议的操作：Converting Image to Color array

我复制的代码：

BufferedImage bi = ImageIO.read( new File( "image.png" ) );
int[] data = ( (DataBufferInt) bi.getRaster().getDataBuffer() ).getData();
for ( int i = 0 ; i < data.length ; i++ ) {
    Color c = new Color(data[i]);
    // RGB is now accessible as
    c.getRed();
    c.getGreen();
    c.getBlue();
}

我在代码中将“image.png”更改为“BA 0091.jpg”。

代码：

public class BANCPU{
  public static void main(String[] Ugh){
    BufferedImage bi = ImageIO.read( new File( "BA 0091.jpg" ) );
    int[] data = ( (DataBufferInt) bi.getRaster().getDataBuffer() ).getData();
    for ( int i = 0 ; i < data.length ; i++ ) {
      Color c = new Color(data[i]);
      // RGB is now accessible as
      c.getRed();
      c.getGreen();
      c.getBlue();
    }
  }
}

我遇到的错误：

File: C:\Users\Ben\Desktop\prgm clas\java junk\BANCPU.java  [line: 3]
Error: cannot find symbol
  symbol:   class BufferedImage
  location: class BANCPU
File: C:\Users\Ben\Desktop\prgm clas\java junk\BANCPU.java  [line: 3]
Error: cannot find symbol
  symbol:   variable ImageIO
  location: class BANCPU
File: C:\Users\Ben\Desktop\prgm clas\java junk\BANCPU.java  [line: 3]
Error: cannot find symbol
  symbol:   class File
  location: class BANCPU
File: C:\Users\Ben\Desktop\prgm clas\java junk\BANCPU.java  [line: 4]
Error: cannot find symbol
  symbol:   class DataBufferInt
  location: class BANCPU
File: C:\Users\Ben\Desktop\prgm clas\java junk\BANCPU.java  [line: 6]
Error: cannot find symbol
  symbol:   class Color
  location: class BANCPU
File: C:\Users\Ben\Desktop\prgm clas\java junk\BANCPU.java  [line: 6]
Error: cannot find symbol
  symbol:   class Color
  location: class BANCPU

解决方法

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