Java（基础）多态数组

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package com.day12.Polymorphism;

import javax.jnlp.PersistenceService;

public class PersonTest2 {
    public static void main(String[] args) {
        //创建一个数组，可融合你各种不同类型的对象时，需要多态，这样的数组称为多态数组
        Person[] arr = new Person[5];
        arr[0] = new Chinese("张三", 30, "男", "虎");
        arr[1] = new American("Banner", 20, "male", true);
        arr[2] = new Person("someBody", 25, "unknown");
        arr[3] = new American("Rose", 19, "famale", false);
        arr[4] = new Beijing("李四", 40, "女", "猪");
        for (int i = 0; i < arr.length; i++) {
            System.out.println(arr[i].toString());
        }
        System.out.println("=====================================================================");
        //排序
        for (int i = 0; i < arr.length - 1; i++) {
            for (int j = 0; j < arr.length - 1 - i; j++) {
                if (arr[j].getAge() > arr[j + 1].getAge()) {
                    Person tmp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = tmp;
                }
            }
        }
        for (Person tmp :
                arr) {
            System.out.println(tmp);
        }
    }
}

package com.day12.Polymorphism;

public class ComputerTest {
    public static void main(String[] args) {
        //创建一个多态数组
        Computer[] cmArr = new Computer[5];
        cmArr[0] = new PC(5.0,16,800,19999,"corsair");
        cmArr[1] = new NotePad(2.4,8,200,3999,5);
        cmArr[2] = new NotePad(2.6,16,400,8999,8);
        cmArr[3] = new PC(3.5,8,500,3999,"cherry");
        cmArr[4] = new Computer(3,4,300,2000);
        for (Computer tmp :
                cmArr) {
            System.out.println(tmp.getDetails());
        }
        System.out.println("=============================================================");
        //使用选择排序根据价格进行排序
        for (int i = 0; i <cmArr.length-1 ; i++) {
            int minIndex = i;
            for (int j = i+1; j <cmArr.length ; j++) {
                if(cmArr[j].getPrice()<cmArr[minIndex].getPrice()){
                    minIndex = j;
                }
            }
            Computer tmp = cmArr[i];
            cmArr[i] = cmArr[minIndex];
            cmArr[minIndex] = tmp;


        }
        for (Computer tmp :
                cmArr) {
            System.out.println(tmp.getDetails());
        }
    }
}

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