class Foo {
    private String string;
    private Date date;
    private i;
    
    [...]

    public int hashCode() {
        int result;
        result = (string != null ? string.hashCode() : 0);
        result = 29 * result + (date != null ? date.hashCode() : 0);
        result = 31 * result + (i != null ? i : 0);
        [...]
        return result;
    }

class Foo {
   private String string;
   private int i;
   [...]

   public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Foo)) return false;

        final Foo other = (Foo) o;

        if (string != null ? !string.equals(other.name) : other.name != null) return false;
        if (i != other.i) return false;
        [...]
        return true;
}

class Foo {
   private final Log log = LogFactory.getLog(getClass());
}

class Foo {
   private static final Log log = LogFactory.getLog(Foo.class);
}

Object[] array = new Object[]{"12","23","34"};
java.util.List list = Arrays.asList(array);