从数组中取值后随机搭配求最大值

java写法

int arr[]={3,123,234};
        Set<Integer> set=new HashSet<>();
        while (true){
            int index1=(int)(Math.random()*arr.length);
            String s1=String.valueOf(arr[index1]);
            int index2=(int)(Math.random()*arr.length);
            String s2=String.valueOf(arr[index2]);
            int index3=(int)(Math.random()*arr.length);
            String s3=String.valueOf(arr[index3]);
            if(!s1.equals(s2)&&!s1.equals(s3)&&!s2.equals(s3)){
                String s=s1+s2+s3;
                set.add(Integer.valueOf(s));
            }
            if(set.size()>=6){
                break;
            }
        }
        Integer integer = set.stream().max(Integer::compareTo).get();
        System.out.println(set);
        System.out.println(integer);

　　python写法：

import random
# 从a中取出3个数，随机组合，并找出最大值
a=[3,123,234]
b=[]
while True:
    i=str(a[random.randint(0,2)])
    j=str(a[random.randint(0,2)])
    k=str(a[random.randint(0,2)])
    if i==j or i==k or j==k:
        continue
    s=i+j+k
    if s not in b:
        b.append(int(s))
    if len(b)>=6:
        break

max=b[0]
for i in range(0,5):
    if b[i]<b[i+1] and max<b[i+1]:
        max=b[i+1]
print(max)
这种写法有明显的Bug 正确解法如下

import random
l=[234,456,789]
l2 = []
while True:
    num1=str(random.choice(l))
    num2=str(random.choice(l))
    num3=str(random.choice(l))
    if num3==num2 or num2==num1 or num1==num3:
        continue
    s=num2+num1+num3
    if s not in l2:
        l2.append(s)
    if len(l2)>=6:
        break
print(l2)
max=int(l2[0])
for i in range(0,6):
    print(l2[i])
    if max<int(l2[i]):
        max=int(l2[i])
print("=============")
print(max)