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Why does maximum use compareTo instead of ==? (Hint: why can’t you use == with object reference variables?

Why does maximum use compareTo instead of ==? (Hint: why can’t you use == with object reference variables?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Answer for the following question based on the JAVA code provided.

Why does maximum use compareTo instead of ==? (Hint: why can’t you use == with object reference variables?

Create the following Java class to demonstrate Generics. public class MaximumTest { // determines the largest of three Comparable objects } public static <T extends Comparable<T>> T maximum(T x, Ty, T z) { T max = x; // assume x is initially the largest } if(y.compareTo(max) > 0) { max = y; // y is the largest so far } } if(z.compareTo(max) > 0) { max = z; // z is the largest now } return max; // returns the largest object public static void main(String args[]) { System.out.printf("Max of %d, %d and %d is %d\n\n", 3, 4, 5, maximum( 3, 4, 5)); System.out.printf("Max of %.1f,%.1f and %.1f is %.1f\n\n", 6.6, 8.8, 7.7, maximum( 6.6, 8.8, 7.7 )); System.out.printf("Max of %s, %s and %s is %s\n", "pear", "apple", "orange", maximum ("pear", "apple", "orange")); JL 17
Transcribed Image Text:Create the following Java class to demonstrate Generics. public class MaximumTest { // determines the largest of three Comparable objects } public static <T extends Comparable<T>> T maximum(T x, Ty, T z) { T max = x; // assume x is initially the largest } if(y.compareTo(max) > 0) { max = y; // y is the largest so far } } if(z.compareTo(max) > 0) { max = z; // z is the largest now } return max; // returns the largest object public static void main(String args[]) { System.out.printf("Max of %d, %d and %d is %d\n\n", 3, 4, 5, maximum( 3, 4, 5)); System.out.printf("Max of %.1f,%.1f and %.1f is %.1f\n\n", 6.6, 8.8, 7.7, maximum( 6.6, 8.8, 7.7 )); System.out.printf("Max of %s, %s and %s is %s\n", "pear", "apple", "orange", maximum ("pear", "apple", "orange")); JL 17
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