字符串拼接——Java

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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);

输出结果为： s is : 123 sdf