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15) What method do you need to write, to implement the Comparable interface?

15) What method do you need to write, to implement the Comparable interface?

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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How do you do this? JAVA
**Question 15:** *What method do you need to write to implement the Comparable interface?* --- Explanation: When implementing the Comparable interface in Java, you need to write the `compareTo` method. This method is used to compare the current object with another object of the same type and is a key part of defining the natural order for a class. Here is the general declaration of the `compareTo` method: ```java public int compareTo(T o); ``` Where `T` is the type of objects that this object may be compared to. The `compareTo` method returns a negative integer, zero, or a positive integer if this object is less than, equal to, or greater than the specified object, respectively. This ordering is used when objects are sorted for example by Collections.sort() or by SortedSet. Example: ```java public class Student implements Comparable<Student> { private String name; private int grade; public Student(String name, int grade) { this.name = name; this.grade = grade; } @Override public int compareTo(Student other) { return Integer.compare(this.grade, other.grade); } } ``` In the above example, the `compareTo` method compares the grade fields of two Student objects.
Transcribed Image Text:**Question 15:** *What method do you need to write to implement the Comparable interface?* --- Explanation: When implementing the Comparable interface in Java, you need to write the `compareTo` method. This method is used to compare the current object with another object of the same type and is a key part of defining the natural order for a class. Here is the general declaration of the `compareTo` method: ```java public int compareTo(T o); ``` Where `T` is the type of objects that this object may be compared to. The `compareTo` method returns a negative integer, zero, or a positive integer if this object is less than, equal to, or greater than the specified object, respectively. This ordering is used when objects are sorted for example by Collections.sort() or by SortedSet. Example: ```java public class Student implements Comparable<Student> { private String name; private int grade; public Student(String name, int grade) { this.name = name; this.grade = grade; } @Override public int compareTo(Student other) { return Integer.compare(this.grade, other.grade); } } ``` In the above example, the `compareTo` method compares the grade fields of two Student objects.
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