Java Comparable.compareTo(T o)
Syntax
Comparable.compareTo(T o) has the following syntax.
int compareTo(T o)
Example
In the following code shows how to use Comparable.compareTo(T o) method.
//from w w w.j ava 2 s. c o m
import java.util.Arrays;
public class Main {
public static void main(String[] args) {
Employee[] staff = new Employee[3];
staff[0] = new Employee("HTML", 35000);
staff[1] = new Employee("Java", 75000);
staff[2] = new Employee("CSS", 38000);
Arrays.sort(staff);
for (Employee e : staff){
System.out.println("name=" + e.getName() + ",salary=" + e.getSalary());
}
}
}
class Employee implements Comparable<Employee> {
public Employee(String n, double s) {
name = n;
salary = s;
}
public String getName() {
return name;
}
public double getSalary() {
return salary;
}
public void raiseSalary(double byPercent) {
double raise = salary * byPercent / 100;
salary += raise;
}
/**
* Compares employees by salary
*
* @param other
* another Employee object
* @return a negative value if this employee has a lower salary than
* otherObject, 0 if the salaries are the same, a positive value
* otherwise
*/
public int compareTo(Employee other) {
if (salary < other.salary)
return -1;
if (salary > other.salary)
return 1;
return 0;
}
private String name;
private double salary;
}
The code above generates the following result.
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