title: Keyboard cannot be resolved
body: <p>Im a newbie on Java. I get an error. These are my simple codes:</p>
  
  <pre><code>public class AreaRect {
  
  
      public static void main(String[] args) {
          int height, width, area;
          System.out.print("yukseklik?");
          height = Keyboard.readInt();
          System.out.print("genislik?");
          width = Keyboard.readInt();
          area = height * width;
          System.out.print(area);
  
      }
  
  }
  </code></pre>
  
  <p>and I get this error:</p>
  
  <pre><code>Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
      Keyboard cannot be resolved
      Keyboard cannot be resolved
  
      at AreaRect.main(AreaRect.java:8)
  </code></pre>
  
  <p>I have a Keyboard.class file in the same directory with AreaRect.java..
  Please can you tell me where am I wrong?</p>