Java优学网字符串比较入门解析：掌握equals与==区别，避免常见错误

String s1 = "hello"; String s2 = new String("hello");

String name1 = "张三"; String name2 = new String("张三"); System.out.println(name1 == name2); // false System.out.println(name1.equals(name2)); // true

private static final Map<String, String> cache = new HashMap<>();

public static String getCachedString(String input) {

return cache.computeIfAbsent(input, key -> key);

}

// 推荐 if (Objects.equals(str1, str2)) {

// 业务逻辑

}

// 不推荐 if (str1 != null && str1.equals(str2)) {

// 业务逻辑

}