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Hash_Map.java
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Hash_Map.java
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package practicetime;
import java.util.*;
public class Hash_Map
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
int c;
HashMap<String,Integer> m=new HashMap<>();
print (m);
do
{
System.out.print(" Enter Name And Age - ");
String s=sc.next();
int a=sc.nextInt();
m.put(s, a);
System.out.print(" Want To Add More Press 1- ");
c=sc.nextInt();
}while(c==1);
print(m);
System.out.println(" Size Of Map - "+m.size());
System.out.print(" Enter The Key To Check The Value - ");
String s1=sc.next();
if(m.containsKey(s1))
{
Integer a=m.get(s1);
System.out.println(" Value Of "+s1+" is - "+a);
}
else
{
System.out.println(" Key Not Present ");
}
m.clear();
print(m);
}
public static void print(HashMap<String,Integer> m)
{
if(m.size()==0)
{
System.out.println(" Empty ");
}
else
{
System.out.println(m);
Set<String> gk=m.keySet();
System.out.print(" Keys - "+gk);
Collection<Integer> gv=m.values();
System.out.println(" Values - "+gv);
}
}
}