Integer representing the number of characters to copy 整数,表示要复制的字符数。
The maximum number of characters to copy into the buffer 要复制到缓冲区中的最大字符数。
Integer value representing the number of characters to copy 整数值,表示要复制的字符数。
Characters to copy 待复制字符
This method takes the source index , an array of characters , the destination index , and the number of characters to copy 此方法带有四个参数,即源索引、字符数组、目标索引和要复制的字符数。