Java生成6位随机数

//新建一个HashSet

HashSet<String> sixHashSet = new HashSet<String>();

//满6位时结束循环

while (sixHashSet.size() != 6) {
　　String temp = Integer.toString((int) (Math.random() * 10));
　　sixHashSet.add(temp);
}

//拼接结果

String sixString = "";
for (String string : sixHashSet) {
　　sixString = sixString + string;
}

//打印结果

System.out.println(sixString);