设有一个含若干水果单词组成的字符串数组，编程统计该数组中共有多少种水果。假设调试的数据如下： ‎‍ String fruit[]= { "apple","pear","apple","apple","orange","pear","apple"}; Java语言

可以使用一个 HashSet 来统计数组中不同水果的数量，代码如下：

String fruit[] = { "apple", "pear", "apple", "apple", "orange", "pear", "apple" };
Set<String> set = new HashSet<String>();
for (String f : fruit) {
    set.add(f);
}
int count = set.size();
System.out.println("共有 " + count + " 种水果。");

输出结果为：共有 3 种水果。