How to use java to concatenate strings

1. The Java language allows the use of symbols to connect (splice) two strings.

2. When a string is concatenated with a non-empty string value, the latter will be converted into a string (any Java object can be converted into a string).

Example

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);

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