sorttest.java

来自「继承和多态 实验目的： 1、 掌握继承和多态的概念与实现方法 2、 掌握如」· Java 代码 · 共 63 行

package generalSort;

/**
 * <p>Title: SortTest</p>
 *
 * <p>Description:A derivative class for the base class GeneralSort, which implements the method compare declared in the base class </p>
 *
 * <p>Copyright: Copyright (c) 2008 All rights reserved</p>
 * <p>Organization:Shandong University </p>
 * @Email:[e-mail]
 * @author: Xiao Ruohan
 * @version 1.0
 */
public class SortTest extends GeneralSort {
    public SortTest() {
    }

    int compare(int a, int b) {
        if (a > b) {
            return 1;
        } else if (a == b) {
            return 0;
        }
        return -1;
    }

    int compare(double a, double b) {
        if (a > b) {
            return 1;
        } else if (a == b) {
            return 0;
        }
        return -1;
    }


    int compare(String str1, String str2) {
        int result = str1.compareTo(str2);
        if (result > 0) {
            return 1;
        } else if (result == 0) {
            return 0;
        }
        return -1;
    }

    int compare(Object a, Object b) {//overwrite the orignal method extends GeneralSort
        if (a instanceof Student && b instanceof Student) {
            int flag_a = ((Student) a).getFlag();
            int flag_b = ((Student) b).getFlag();
            if (flag_a == flag_b && flag_a == 1) {
                return this.compare(((Student) a).getID(), ((Student) b).getID());
            }
            return this.compare(((Student) a).getName(), ((Student) b).getName());
        } else if (a instanceof Rectangle && b instanceof Rectangle) {
            return this.compare(((Rectangle) a).area(), ((Rectangle) b).area());
        }

        return -2;

    }
}