Note: The char type is integral but unsigned. The range of a variable of type char is from 0 to 216-1 or 0 to 65535. Java characters are Unicode, which is a 16-bit encoding capable of representing a wide range of international characters. If the most significant nine bits of a char are 0, then the encoding is the same as seven-bit ASCII.

Note: (2) - This is a Java keyword (3) - This is a Java keyword (1) - Is incorrect because although it is a method of Thread/Runnable it is not a keyword (4) - This is not a Java keyword the keyword is implements