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Literals
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C# and Java both support the same categories of literal values. No differences exist between the Boolean and Null literals in either language. Table 4-12 summarizes the key differences between Integer, Real, Character, and String literals.
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Table 4-12. Literal Values
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Category Comments Integer C# adds support for unsigned integer and unsigned long literals. C# does not support octal representations of integer literals. C# adds support for decimal literals. Use the M or m suffix to specify a decimal Real literal. Character C# does not support octal escape sequences to represent characters. In C#, the escape sequence \0 represents null.
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4. Language Syntax and Features
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C# supports verbatim string literals. Preceding the string with the @ symbol causes the compiler not to interpret simple, hexadecimal, or Unicode escape sequences within the string. This is useful when working with directory and file names and regular expressions.
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Modifiers
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C# and Java both use modifiers to specify the accessibility and behavior of program elements. Much commonality exists between Java and C# modifiers, but many differences and inconsistencies exist as well. The differences in usage and effect are often subtle and difficult to understand and remember when coming to C# from a Java background. In this section, we contrast the Java and C# modifiers. We group these modifiers into three categories: access, inheritance, and other.
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Access Modifiers
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C# includes all of the access modifiers available in Java and provides additional flexibility with the introduction of two new modifiers. However, accessibility based on package membership in Java doesn't translate to the equivalent accessibility based on namespace membership in C#. In Java, a program element with no access modifier is accessible to all members of the same package. C# has no direct equivalent; the closest match is the internal modifier. Table 4-13 contrasts the Java and C# access modifiers.
Table 4-13. Access Modifiers
Java public
Accessibility of Program Element No access restrictions are enforced. Any code can access a public element. protected protected Accessible only to members of the containing class and members of derived classes. This is notably different from the meaning of protected in Java, which permits access by all members of the containing package and only those members outside the package that are derived from the containing class. Accessible only to members of the containing class or struct. private Accessible only to program elements contained within the same internal assembly. protected The protected internal combination is the only valid combination of internal access modifiers. Accessibility is equivalent to that granted by the protected or internal modifier (in other words, it is the union of the two, not the intersection), resulting in the element being accessible to any code within the containing assembly as well as any members of the containing class or classes derived from the containing class.
C# public
private N/A N/A
4. Language Syntax and Features
Inheritance Modifiers
C# provides more inheritance modifiers than Java to accommodate the additional control over member inheritance provided by C#. See the "Versioning and Inheritance of Members" section in 5 for more details of inheritance in C#. Table 4-14 contrasts the Java and C# inheritance modifiers.
Table 4-14. Inheritance Modifiers
Java C# Effect on Modified Member abstract abstract The abstract modifier is applicable to both classes and members of classes. Use of the abstract modifier on a class declaration identifies that the class cannot be directly instantiated. Abstract classes have a potentially incomplete implementation and are intended for use as base classes from which other classes will be derived. Use of the abstract modifier on a class declaration identifies that the class cannot be directly instantiated. Abstract classes have a potentially incomplete implementation and are intended for use as base classes from which other classes will be derived.
The abstract and sealed modifiers are mutually exclusive. Structs are not valid targets of the abstract modifier because they do not support inheritance. When applied to members of abstract classes, abstract identifies an incomplete member implementation that must be provided by a derived class. All abstract members are implicitly virtual. The abstract modifier is mutually exclusive with the static, virtual, and override modifiers. A member marked as abstract cannot contain implementation code; an empty statement must follow the declaration. The member in the derived class that provides the implementation of the abstract member must have the override modifier.
Explicitly confirms the intention to hide an inherited member of the same name. This behavior is not available in Java but is the default behavior applied to members in C#. Despite being the default behavior, the compiler will raise warnings if the new keyword is not used. Note that this should not be confused with the word new used in the context of object instantiation.
If the new modifier is used on a member that is not hiding an inherited member, the compiler will generate a warning.
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