Java模拟人工洗牌

public class Test {
public List<String> list = new ArrayList<String>();
public Test(){
String[] color = new String[]{"黑桃","红桃","方片","草花"};
String[] num = new String[]{"A","2","3","4","5","6","7","8","9","10","J","Q","K"};
for(int i = 0;i < 4;i ++){
for(int j = 0;j < 13;j ++){
list.add(color[i] + num[j]);
}
}
list.add("小王");
list.add("大王");
//System.out.println(list);
}
public void Sort(){
String[] s = (String[]) list.toArray(new String[list.size()]);
int[] n = new int[54];
for(int i = 0;i < 54;i ++){
n[i]  = (int) (Math.random() * 54);
int j = 0;
while(j < i){
if(n[i] == n[j]){
n[i] = (int) (Math.random() * 54);
j =- 1;
}
j ++;

}

}