can we insert duplicate key in hashmap?

Question

i done it using stringbuilder got the o/p as {abc=value-bb, abc=value-cc, abc=value-aa, abc=value-abc}

but wanted to know if it is possible by using Weak reference

Answer 1

import java.util.HashMap;


class Hash {

    public static void main(String[] args) {
        HashMap<StringBuffer, String> mp = new HashMap<StringBuffer, String>();
        mp.put(new StringBuffer("abc"),"value-abc");
        mp.put(new StringBuffer("abc"),"value-abc");
        mp.put(new StringBuffer("abc"),"value-abc");
        StringBuffer ojas= null;
        System.out.println(mp);
    }
}

Output

{abc=value-abc, abc=value-abc, abc=value-abc}