截取如下字符串“java程序教程”的前5个字节,字符串应该为“java程”,截取前6个字符,字符串也应该为“java程”,程序实现之.

Intercept the first 5 bytes of the following string "java program tutorial", the string should be "java program", intercept the first 6 characters, the string should also be "java program", the program implements.