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1.字符串拼接
String1.concat(String2);
String s1 = "abc";
String s2 = "fgh";
String s = s1.concat(s2);
System.out.println(s);
输出结果为:abcfgh
2. 字符串占位
String s1 = "123";
String s2 = "sdf";
logger.info("s is : {} {}",s1,s2);