`args String str, Collection col, boolean b, Object[] a1, int[] a2, int i, String s2

<p>
<pre>
`verbatim
    `if expr {
        xxx
    `} else if expr {
        yyy
    `} else {
        zzz
    `}
`
</pre>
</p>
<p>
    is equals to
</p>
<p>
<pre>
`verbatim
    `if(cn.bran.play.WebUtils.asBoolean(expr)){
        xxx
    `} else if(cn.bran.play.WebUtils.asBoolean(expr)){
        yyy
    `} else {
        zzz
    `}
`
<pre>

<p/>
`if str {
    Got $str
`} else if str {
    finally got $str
`} else {
    str is empty
`}
<p/>

`if col {
    Got data from col: $col
`} else {
    col is empty
`}

<p/>
`if b {
    right
`} else {
    wrong
`}

<p/>
`if a1 {
    got a1: $a1
`} else {
    a1 is empty
`}
<p/>
`if a2{
    got a2: $a2
`} else {
    a2 is empty
`}
<p/>
`if i{
    got i: $i
`} else {
    i == 0
`}
<p/>
`if s2 {
    got s2: $s2
`} else {
    s2 is empty
`}

<p>try the negation</p>
`String ss = str;
`if ! ss
    ss is empty
`else if !ss 
    again...
`else
    ss has something
`