java - 查找 ArrayList 是否至少包含一个不同的字符串

Question

我有一个Arraylist可能包含或不包含重复项的字符串，

list = ["car", "car", "car"]或list = ["car", "car", "bike", "car"]

我想知道如下内容，

if(list contains All same strings)
 same = true
else if(list contains atleast one different element)
 same = false

请帮我写下上述条件。

Answer 1

将所有值放入Set中并检查大小是否为1或更大。

List<String> list = Arrays.asList("car", "car", "bike", "car");
Set<String> unique = new HashSet<String>(list);
boolean same;

if (unique.size() > 1) {
    same = false;
} else {
    same = true;
}
System.out.println(same); // prints false
System.out.println(list); // prints [car, car, bike, car]