Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Please give a detailed answer to the two questions below.
Transcribed Image Text:5.
What is polymorphism?
O A: It is a way to allow subclasses inherit properties and functions from super classes
B: It is a way to allow same functionality supported by different methods
O C: it is a way to allow different functionality supported by same method
O D: It is a way to allow same method name to represent multiple types
6.
Which one of below is a good practice? and Why?
1.
public static final HashMap<Integer, String> hm = new HashMap<Integer, String>();
2.
private static final HashMap<Integer, String> hm = new HashMap<Integer, String>();
public static String getElement (int key) {
return hm.get(key);
}
A: 1st, because it is this is static object and application can access it easliy
O B: 1st, as it has less lines of code
O C: 2nd, as it controls access to the map
O D: 2nd, as it is easy to remember
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