Background and Goals in Java

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A general goal for designing the libraries for the Connected, Limited Device Configuration was to provide a minimum useful set of libraries for practical application development and profile definition for a variety of small devices As explained earlier in Section 31, "High-Level Goals," CLDC is a "lowest common denominator" standard that includes only minimal Java platform features and APIs for a wide range of consumer devices Given the strict memory constraints and differing features of today's small devices, it is virtually impossible to come up with a set of libraries that would be ideal for all devices No matter where the bar for feature inclusion is set, the bar is inevitably going to be too low for some devices and users, and too high for many others
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To ensure upward compatibility with the larger editions of the Java 2 Platform, the majority of the libraries included in CLDC are a subset of Java 2 Standard Edition (J2SE) and Java 2 Enterprise Edition (J2EE) While upward compatibility is a very desirable goal, J2SE and J2EE libraries have strong internal dependencies that make subsetting them difficult in important areas such as security, input/output, user interface definition, networking, and storage These dependencies are a natural consequence of design evolution and reuse that has taken place during the development of the libraries over time Unfortunately, these dependencies make it difficult to take just one part of the libraries without including several others For this reason, some of them have been redesigned, especially in the area of networking
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The libraries defined by the CLDC Specification can be divided broadly into two categories: 1 those classes that are a subset of standard J2SE libraries, and 2 those classes that are specific to CLDC (but that can be mapped onto J2SE)
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Classes belonging to the former category are located in packages javalang, javautil, and javaio These classes have been derived from Java 2 Standard Edition version 131 A list of these classes is presented in Section 52, "Classes Derived from Java 2 Standard Edition"
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Classes belonging to the latter category are located in package javaxmicroedition These classes are discussed in Section 53, "CLDC-Specific Classes" [ Team LiB ]
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[ Team LiB ]
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52 Classes Derived from Java 2 Standard Edition
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CLDC provides a number of classes that have been derived from Java 2 Standard Edition (J2SE) The rules for J2ME configurations require that each class with the same name and package name as a J2SE class must be identical to or a subset of the corresponding J2SE class The semantics of the classes and their methods included in the subset may not be changed The classes may not add any public or protected methods or fields that are not available in the corresponding J2SE classes
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521 System Classes
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J2SE class libraries include several classes that are intimately coupled with the Java Virtual Machine Similarly, several commonly used Java tools assume the presence of certain classes in the system For instance, the standard Java compiler (javac) generates code that requires certain methods of classes String and StringBuffer to be available
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The system classes included in the CLDC Specification are listed below Each of these classes is a subset of the corresponding class in J2SE Note that in CLDC 11, many of these classes contain additional methods that are not present in CLDC 10 Refer to CLDC library documentation in the end of this book for more details on each class, as well as for the differences between CLDC 10 and 11
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javalangObject javalangClass javalangRuntime javalangSystem javalangThread javalangRunnable (interface) javalangString javalangStringBuffer javalangThrowable
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522 Data Type Classes
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The following basic data type classes from package javalang are supported Each of these classes is a subset of the corresponding class in J2SE Classes Float and Double are new in CLDC 11
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javalangBoolean javalangByte javalangShort javalangInteger javalangLong javalangFloat javalangDouble javalangCharacter
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