java拼接字符串的使用

int age = 13;

String rating = "PG" + age;  //将rating设置为 "PG13"

//使用静态的 join 方法可以把多个字符串放在一起

//并指定一个界定符分隔

String all = String.join("/","S","M","L","XL");  //all的值为 S/M/L/XL

//repeated的值为 javajavajava

String repeated = "java".repeat(3);