Java中常见的字符串拼接/模板化方式详解

String s = "姓名：" + name + "，年龄：" + age;

StringBuilder sb = new StringBuilder();

sb.append("姓名：")
  .append(name)
  .append("，年龄：")
  .append(age);

String s = sb.toString();

StringBuffer sb = new StringBuffer();
sb.append("abc");

String s = String.format(
        "姓名：%s，年龄：%d",
        name,
        age
);

MessageFormat.format(
        "姓名：{0}，年龄：{1}",
        name,
        age
);

String s = """
        用户：%s
        年龄：%d
        """.formatted(name, age);

String s = "姓名：%s，年龄：%d"
        .formatted(name, age);

String.format(...)

StringJoiner joiner = new StringJoiner(",");

joiner.add("A");
joiner.add("B");
joiner.add("C");

System.out.println(joiner);

A,B,C

String s = String.join(",", "A", "B", "C");

List<String> list = Arrays.asList("A", "B", "C");

String s = String.join(",", list);

List<String> list = Arrays.asList("A", "B", "C");

String s = list.stream()
        .collect(Collectors.joining(","));

你好 ${name}

log.info("用户 {} 登录，IP {}", name, ip);

log.info("用户：" + name);

template.replace("{0}", value)