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Multi-valued hashtable in Java

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余生分开走
余生分开走 2020-12-06 09:41

Is it possible to have multiple values for the same key in a hash table? If not, can you suggest any such class or interface which could be used?

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  • 一向
    一向 (楼主)
    2020-12-06 10:02

    Following code without Google's Guava library. It is used for double value as key and sorted order

    Map> multiMap = new TreeMap>();

for( int i= 0;i<15;i++)
{
    List myClassList = multiMap.get((double)i);
    if(myClassList == null)
    {
        myClassList = new ArrayList();
        multiMap.put((double) i,myClassList);
    }
    myClassList.add("Value "+ i);
}

List myClassList = multiMap.get((double)0);
if(myClassList == null)
{
    myClassList = new ArrayList();
    multiMap.put( (double) 0,myClassList);
}
myClassList.add("Value Duplicate");
for (Map.Entry entry : multiMap.entrySet()) 
{
  System.out.println("Key = " + entry.getKey() + ", Value = " +entry.getValue());
}

    
    
             
    
                                                        
    
            
            
    
              
                
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