高分，帮忙下，谁知道把PhP代码转成Java代码

<?php
$prize_arr = array(
'0' => array('id'=>1,'prize'=>'平板电脑','v'=>3),
'1' => array('id'=>2,'prize'=>'数码相机','v'=>5),
'2' => array('id'=>3,'prize'=>'音箱设备','v'=>10),
'3' => array('id'=>4,'prize'=>'4G优盘','v'=>12),
'4' => array('id'=>5,'prize'=>'Q币10元','v'=>20),
'5' => array('id'=>6,'prize'=>'下次没准就能中哦','v'=>50),
);

foreach ($prize_arr as $key => $val) {
$arr[$val['id']] = $val['v'];
}

$rid = getRand($arr); /*根据概率获取奖项id*/
$res['msg'] = ($rid==6)?0:1;
$res['prize'] = $prize_arr[$rid-1]['prize']; /*中奖项*/
echo json_encode($res);exit;

/*计算概率*/
function getRand($proArr) {
$result = '';

/*概率数组的总概率精度*/
$proSum = array_sum($proArr);

/*概率数组循环*/
foreach ($proArr as $key => $proCur) {
    /*相当于每次只能够抽取其中的一个奖项，没抽中就开始抽下一个奖项，直到最后*/
    $randNum = mt_rand(1, $proSum);
    if ($randNum <= $proCur) {
        /*表示抽中奖了，该奖品应该要减一*/
        $result = $key;
        break;
    } else {
        /*没有抽中就不能再抽了，直到敲到下一个金蛋*/
        $proSum -= $proCur;
    }
}
unset ($proArr);
return $result;

}
?>

http://www.oschina.net/question/143710_135554

本人并不是很懂php，，不过大致可以看懂，代码如下：
public class Guess {
private int id;
private String prize;
private int v;
public Guess(int id, String prize, int v) {
super();
this.id = id;
this.prize = prize;
this.v = v;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPrize() {
return prize;
}
public void setPrize(String prize) {
this.prize = prize;
}
public int getV() {
return v;
}

public void setV(int v) {
    this.v = v;
}

}

public class WinPrize {
private int mes;
private String prize;
public int getMes() {
return mes;
}
public WinPrize(int mes, String prize) {
super();
this.mes = mes;
this.prize = prize;
}
public WinPrize() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "mes:" + mes + ", prize:" + prize;
}
public void setMes(int mes) {
this.mes = mes;
}
public String getPrize() {
return prize;
}
public void setPrize(String prize) {
this.prize = prize;
}

}

public class TestPHP {
public void guess_prize(){
Map prize_attr=new HashMap();
Integer[] arr=null;
prize_attr.put(0, new Guess(1,"平板电脑",3));
prize_attr.put(1, new Guess(2,"数码相机",5));
prize_attr.put(2, new Guess(3,"音箱设备",10));
prize_attr.put(3, new Guess(4,"4G优盘",12));
prize_attr.put(4, new Guess(5,"Q币10元",20));
prize_attr.put(5, new Guess(6,"下次没准就能中哦",50));
arr=new Integer[prize_attr.size()+1];
for(Guess g:prize_attr.values()){
//System.out.println(prize_attr.size());
arr[g.getId()]=g.getV();
}
WinPrize res=new WinPrize();
int rid=getRand(arr);
if(prize_attr.get(rid)==null){
res.setMes(0);
res.setPrize("下次没准就能中哦");
}else{
res.setMes(rid==6?0:1);
res.setPrize(prize_attr.get(rid).getPrize());
}
System.out.println(res);
}

public int getRand(Integer[] arr){
    int sum=0;
    int result=0;
    //System.out.println(arr);
    for(int i=1;i<arr.length;i++){
        sum+=arr[i];
    }
    for(int i=1;i<arr.length;i++){
        Random r=new Random();
        int random=r.nextInt(sum)+1;//arr长度为6，生成1-6的随机数
        if(random<=arr[i]){
            result=i;
            break;
        }else{
            sum-=arr[i];
        }
    }

    return result;
}
public static void main(String[] args) {
    new TestPHP().guess_prize();        
}

}