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HashmapCollections.java
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HashmapCollections.java
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package classFiles;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
public class HashmapCollections {
public static void main(String[] args)
{
HashMap<String,Integer> hm=new HashMap<>();
//Name, Net Worth(in dollars)
hm.put("Kamalika",100);
hm.put("Srijit",140);
hm.put("Jividha",100);
hm.put("Kamalika",90);
if(hm.containsKey("Kamalika"))
System.out.println("Kamalika is present in the map");
if(!hm.containsKey("Rumi"))
System.out.println("Rumi is not present in the map");
System.out.println(hm.get("Rumi"));
//Iteration1
for(Map.Entry<String,Integer> m: hm.entrySet()) {
System.out.print(m.getKey() + " ");
System.out.print(m.getValue());
System.out.println();
}
hm.remove("Jividha");
System.out.println();
//Iteration2
Set<String> keys=hm.keySet();
for(String key: keys)
System.out.println(key+" "+hm.get(key));
}
}