sortdemo.java

来自「java是一种面向对象程序的语言,我这里介绍了有关java课件的许多事例,它能帮」· Java 代码 · 共 53 行

package book.ch6;

import java.util.List;
import java.util.ArrayList;
import java.util.Collections;

public class SortDemo {
	public static void main(String[] args) {
		List list = new ArrayList();
		list.add(new EmployeeSalary(300));
		list.add(new EmployeeSalary(400));
		list.add(new EmployeeSalary(200));
		list.add(new EmployeeSalary(500));
		list.add(new EmployeeSalary(700));
		list.add(new EmployeeSalary(600));

		Collections.sort(list, new SalaryComparator());


		System.out.println(Collections.binarySearch(list, new EmployeeSalary(500)));
	}
}

class EmployeeSalary implements Comparable {
	private double salary;

	public EmployeeSalary(double salary) {
		this.salary = salary;
	}

	public double getSalary() {
		return salary;
	}

	public int compareTo(Object o) {
		return (int) (salary - ((EmployeeSalary) o).getSalary());
	}

	public String toString() {
		return "EmployeeSalary{" +
		       "salary=" + salary +
		       "}";
	}
}

class SalaryComparator implements java.util.Comparator {
	public int compare(Object o1, Object o2) {
		EmployeeSalary salary1 = (EmployeeSalary) o1;
		EmployeeSalary salary2 = (EmployeeSalary) o2;
		return (int) (salary1.getSalary() - salary2.getSalary());
	}
}