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25 paź 2011 · Java does not support the concept of constness as C/C++ use it. The Java equivalent to this Foo class cannot be written. class Foo { public: std::vector<Bar>& bars( void ) const { return m_bars; } private: std::vector<Bar> m_bars; }; However, Java has another approach, using interfaces.
Methods of the String class • String is a class and classes can have methods. • Use the Sun website link to find definitions of the methods for each standard library class • The classes are listed in alphabetical order • The String class has methods that can be used to find out the characteristics of a String object such as its length:
Suppose two or more constant String expressions yield the same value. Only one object of class String will be created and used as the value of all those expressions. This saves space. The Java specification says that method String.intern is used to do this; have a look at this method. As an example, a call of method q below prints true:
fully qualified name of class String is ”java.lang.String” A package does not declare which classes belong in it. Instead a class define which package it belong to. This is done by the package declaration in a sourcefile, e.g., packagegr.uoc.csd.hy252.example
There is a set of standard naming conventions for Java code. These conventions are followed by the Java class libraries and by almost all code you will see in articles and other examples. Please follow them during the course, as this will make it easier for other Java programmers to read your code. • Class names should be nouns.
One constructor allows the use of a string literal as the parameter. Example string constructions: String greeting = new String("Hello, World!"); String name = new String("Marvin Dipwart"); String subject = new String("Math"); Java String literal is created by using double quotes.
8 sty 2010 · C. Most of the standard Java operators may be used with values of type char, which are treated as a 16 bit unsigned integer. For example, if c and d are declared as variables of type char, the following are all legal: DEMO using Dr. Java char c = ‘C’, c1 = ‘C’, d = ‘D’;
