count — count the number of items in the table How to choose the key in a hash table To determine what should be the key in the key-value pair, it must be: Unique (e.g., yellow is a unique word — and though it has many definitions, we can store those definitions at the index...
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Interfaces:The abstract data types are referred to as interfaces in Java. They allow Java collections to be manipulated in a way that is not tied to the specifics of their representation. The Set represents the sorted collection of elements. In addition, object-oriented programming languages form...
importjava.util.Hashtable; publicclassEmployeeCache { staticprivateEmployeeCachecache;// 一个Cache实例 privateHashtable<String,EmployeeRef> employeeRefs;// 用于Chche内容的存储 privateReferenceQueue<Employee> q;// 垃圾Reference的队列 // 继承SoftReference,使得每一个实例都具有可识别的标识。 // 并且该标...
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Aggregation Example in Java For example consider two classesStudentclass andAddressclass. Every student has an address so the relationship between student and address is a Has-A relationship. But if you consider its vice versa then it would not make any sense as anAddressdoesn’t need to have...
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Map<String,String>mutableMap=newHashMap<>();mutableMap.put("key1","value1");Map<String,String>unmodifiableMap=Collections.unmodifiableMap(mutableMap);//Throws java.lang.UnsupportedOperationException//unmodifiableMap.put("key2", "value2");//Changes are visible in both mapsmutableMap.put("key2"...