Java 我怎样才能找到索引值，或者即使数组中存在某个字符串

我尝试过使用.indexof方法，但我不明白为什么它不起作用，因为我所需要的只是查找数组中是否存在值

        final String subject = ((EditText)findViewById(R.id.subject)).getText().toString();


        final String  subjects[] ={"biology","business","chemistry","computer science","critical thinking",
                "economics","english language", "english literature","further mathematics","geography",
                "german","politics","history","ict","japanese","law", "mathematics","psychology",
                "religious studies","sociology","spanish"};

        final String  creative_subjects[] ={"art and design","fine art", "dance","design and technology",
                "design and textiles","fashion and textiles", "film studies ","music","performing arts",
                "photography", "physical education","graphics"};

        creative_subjects.indexOf(subject.toLowerCase());

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数组没有很多有用的方法。但可以将数组包装为列表：

Arrays.asList(creative_subjects).indexOf(...)
Arrays.asList(creative_subjects).contains(...)
// Etc.

试试这个

String[] values = {"AB","BC","CD","AE"};
boolean contains = Arrays.stream(values).anyMatch("s"::equals);

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这是否回答了您的问题？