1. Can you extend main method in Java?
2. Explain how hashmap works internally?
3. Relation between hash code and equals?
3. Difference between StringBuffer/StringBuilder?
4. Code to check the frequency of word occurrence?
5.Code to implement a country/state list generation logic? Follow-up - country name can have aliases
6.Spring bean wiring.

Question

1. Can you extend main method in Java?
2. Explain how hashmap works internally?
3. Relation between hash code and equals?
3. Difference between StringBuffer/StringBuilder?
4. Code to check the frequency of word occurrence?
5.Code to implement a country/state list generation logic? Follow-up  - country name can have aliases
6.Spring bean wiring.

Anonymous · Accepted Answer

public static HashMap funcString(String input) {
        HashMap m = new HashMap();

        for (int i = 0; i < input.length(); i++) {
            char x = input.charAt(i);
            Integer val = m.get(x);
            if (val != null) {
                m.put(x, val + 1);
            } else m.put(x, 1);
        }
        return m ;
    }

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