Question

我有一个hashmap，我使用相同的键在hashmap中输入值。我想只在数据库中没有该值时才在数据库中输入值。

这是我的代码

 s11=json_data.getString("phno");
        Iterator myVeryOwnIterator = map.keySet().iterator();
        while(myVeryOwnIterator.hasNext()) {                                              
    String key=(String)myVeryOwnIterator.next();
    String value=(String)map.get(key);
         if(s11.compareTo(value)==0)
         {//String name2 = cursor.getString(cursor.getColumnIndex(s11 ));
         queryValues.put("c",value);
         //Cursor cursr = contentResolver.query(PhoneCONTENT_URI, null, Phone_CONTACT_ID + " = ?",           new String[] { s11 }, null);
         // Toast.makeText(getActivity(),"get particular name", Toast.LENGTH_LONG).show();
         db.insertcontact(queryValues);
         // Toast.makeText(getActivity(),"true", Toast.LENGTH_LONG).show();
         }
         }

Answer 1

你可以用这种方式吗？

HashMap<String,Integer> hm=new HashMap<String,Integer>(); 
hm.put("AK",1); 
hm.put("BK",2); 
hm.put("CK",3); 
hm.put("DK",4); 
hm.put("EK",5); 
hm.put("FK",6); 
hm.put("GK",7); 
hm.put("HK",6); 
hm.put("IK",7); 


System.out.println("values are "+hm.values()); 

// Removing the duplicate VALUES from Map 
System.out.println("\n After removing duplicate values "); 

for(Object key1:hm.keySet()){ 

for(Object key2:hm.keySet()){ 
if(!key1.toString().equals(key2.toString())){ 
int x=hm.get(key1); 
int y=hm.get(key2); 
if(x==y){ 
    hm.remove(key2); 
} 
} 

}
}

如何删除hashmap中的重复值

1 个答案: