obstinate
发表于 2025-3-26 22:02:20
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Spartan
发表于 2025-3-27 04:50:03
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尾巴
发表于 2025-3-27 05:59:47
String,The . class in Java is a data type that can hold string literals. String is a reference data type, as are all non-primitive data types. This means that the variable contains an address to an object in the memory, and not the object itself. A . object is created in the memory, and the address to the object is returned to the variable.
浪荡子
发表于 2025-3-27 11:35:40
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CREST
发表于 2025-3-27 15:52:01
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要求比…更好
发表于 2025-3-27 21:22:48
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简洁
发表于 2025-3-28 01:32:13
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表否定
发表于 2025-3-28 05:27:28
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FANG
发表于 2025-3-28 07:20:14
Inheritance,Inheritance allows a class to acquire the members of another class. In the example below, Apple inherits from Fruit. This is specified with the . keyword. Fruit then becomes the superclass of Apple, which in turn becomes a subclass of Fruit. In addition to its own members, Apple gains all accessible members in Fruit, except for its constructors.
ABASH
发表于 2025-3-28 13:30:41
Overriding,A member in a subclass can redefine a member in its superclass. This is most often done to give instance methods new implementations.