import javax.swing.UIManager;


public class LookAndFeelTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
LookAndFeelClass lafc = new LookAndFeelClass();
lafc.ViewAll();
    }

}
public class LookAndFeelClass()
{
    public void ViewAll()
    {
        UIManager.LookAndFeelInfo[]    infos = UIManager.getInstalledLookAndFeels();
        for(int i=0;i<infos.length ;i++)
        {
            name = infos[i].getName();
            className = infos[i].getClassName();
            System.out.println(name+className);
        }
    }
    String name = "";
    String className = "";
}

public class LookAndFeelClass
{
    public void ViewAll()
    {
        UIManager.LookAndFeelInfo[]    infos = UIManager.getInstalledLookAndFeels();
        for(int i=0;i<infos.length ;i++)
        {
            name = infos[i].getName();
            className = infos[i].getClassName();
            System.out.println(name+className);
        }
    }
    String name = "";
    String className = "";
}

------解决方案--------------------
第二个类LookAndFeelClass
不能定义成public，或者单独写在另外一个文件

------解决方案--------------------
Java code

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        LookAndFeelClass lafc = new LookAndFeelClass();
        lafc.ViewAll();
    }
}


  class LookAndFeelClass
{
    public void ViewAll()
    {
        UIManager.LookAndFeelInfo[]    infos = UIManager.getInstalledLookAndFeels();
        for(int i=0;i<infos.length ;i++)
        {
            name = infos[i].getName();
            className = infos[i].getClassName();
            System.out.println(name+className);
        }
    }
    String name = "";
    String className = "";
}

------解决方案--------------------
貌似一个类只能有一个public类~~

------解决方案--------------------
修饰符去掉class LookAndFeelClass括号去掉
{
   public void ViewAll()
   {
       UIManager.LookAndFeelInfo[]    infos = UIManager.getInstalledLookAndFeels();
       for(int i=0;i<infos.length ;i++)
       {
           name = infos[i].getName();
           className = infos[i].getClassName();
           System.out.println(name+className);
       }
   }
   String name = "";
   String className = "";
}改成这个样子 试试

------解决方案--------------------
一个.java文件多可以写多个类，但是只能有一个类是public 修饰的

------解决方案--------------------
LookAndFeelClass不要()

------解决方案--------------------
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LookAndFeelClass不要()