java programming

(1) ( ) Java uses Unicode to store the character type, and each Unicode char has 16 bits. (2) All methods in an abstract superclass must be declared abstract. (3) I A Java class can have one or more directed super-classes. (4) I When a String object is created with "Hello, Java!", we can change its content value to "Hello, world". (5) ( ) A Java source can have and only have one pubic class, and this class is the main class for this Java source file. (6) I Java only can support single inheritance, can not support multiple inheritance. (7) A constructor is a special method with the same name as the class that is used to initialize the members of a class object. Constructors are called when objects of their classes are instantiated. (8) 1 ) Abstract methods only maintain the method declarations without method implementations. (9) ) A class can implement multiple interfaces. And an interface can inherit from "multiple interfaces". (10) The Arrays class can mainly operate the array objects for some general purposes, such as sorting array, display array and so on