What is AbstractMap.size() in Java?
AbstactMap.size() in Java is a method of the AbstractMap class. The method is used to get the key-value mappings in a map.
Syntax
public int size()
Parameters
The AbstactMap.size()method takes in no parameters.
Return value
The AbstactMap.size() method returns the size of the key-value mappings in the map.
If the map has more than
Integer.MAX_VALUE element, then the method returnsInteger.MAX_VALUE.
Code
import java.util.*;
public class Abstract_Map_Class{
public static void main(String[] args)
{
AbstractMap<Integer, String> temp_absMap = new TreeMap<Integer, String>();
int size = temp_absMap.size();
System.out.println("The size of the map is " + temp_absMap.size());
temp_absMap.put(1, "Hello");
temp_absMap.put(2, "from");
temp_absMap.put(3, "Educative");
System.out.println("Mapping is : " + temp_absMap);
size = temp_absMap.size();
System.out.println("The size of the map is " + temp_absMap.size());
}
}Explanation
-
First, create
temp_absMap, an emptyAbstractMapclass object. -
Then use the
AbstractMap.size()method to check the size oftemp_absMapand store it in the variablesize. -
Next, use
println()to display the size of thetemp_absmap. -
Then
populate add values/data temp_absmapby mappingstringvalues tointkeys. -
Use
println()again to display thetemp_absmap. -
Next, use the
AbstractMap.size()method again to store the size of thetemp_absmapafter it has key-value pairs mapping stored in it. -
Lastly, we use
println()to display the size of thetemp_absmap.
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