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Aggregation (HAS-A) HAS-A relationship is based on usage, rather than inheritance. In other words, class A has-a relationship with class B, if code in 阅读全文
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Inheritance (IS-A) when a class extends another another class it inherits all non private members including fields and methods. Inheritence in Java ca 阅读全文
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reference: http://www.studytonight.com/java/modifier-in-java.php Modifiers are keywords that are added to change meaning of a definition. In java, mod 阅读全文
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Garbage Collection In Java destruction of object from memory is done automatically by the JVM. When there is no reference to an object, then that obje 阅读全文
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A class can have only public or default(no modifier) access specifier. It can be either abstract, final or concrete (normal class). It must have the c 阅读全文
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In Java, Data types are classified into two categories: 1. Primitive Data Type 2. Non-Primitive Data Type there are 8 primitive data types: char boole 阅读全文
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参考： http://www.cnblogs.com/java-chl/p/5614940.html http://www.studytonight.com/java/component-of-java.php JVM 生命周期 程序开始执行它才运行，程序结束时它就停止。一台机器上运行几个程序就有几 阅读全文
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此文参考： http://www.cnblogs.com/liu-5525/p/5614463.html http://www.studytonight.com/java/abstract-class.php http://www.studytonight.com/java/java-interfa 阅读全文
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此文参考： http://www.cnblogs.com/liu-5525/p/5614425.html 1. classLoader 如何加载 class ClassLoader 负责将 .class 文件(可能在disk上，可能在网络上) 加载到 RAM 里面, 并为之生成对应的 [java.l 阅读全文