title: NimbusLookAndFeel cannot be resolved to a variable
body: <p>I am trying to learn the basic GUI using swing.
  When I tried to activate/set  nimbus, the following error is shown "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel cannot be resolved to a variable". 
  The error is shown in the com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel line in setLookAndFeel() method.
  I am using java build 1.7.0</p>
  
  <pre><code>import java.awt.FlowLayout;
  import javax.swing.UIManager.LookAndFeelInfo;
  import javax.swing.*;
  
  public class swing1 extends JFrame {
      public swing1(){
          super("Title: Swing Project 1");
          //setLookAndFeel();
          setSize(225,80);
          setLookAndFeel();
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          FlowLayout flo = new FlowLayout();
          JButton adds = new JButton ("Add");
          JButton minus = new JButton("Substract");
          JButton mult = new JButton ("Multiply");
          add(adds);
          add(minus);
          add(mult);
          setVisible(true);                   
      }
  
      private void setLookAndFeel() {
          // TODO Auto-generated method stub
          try {
              UIManager.setLookAndFeel(“com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel”);
          }
          catch (Exception exc) {
              //ignore
          }       
      }
  
      public static void main (String args   []){
          swing1 startSwing = new swing1();
      }
  }
  </code></pre>