LYH2277的博客

给非自定义对象排序public class TestDemo04 { public static void main(String[] args) { String[] name = {"CCC","BBB", "AAA"}; Integer[] number = {3, 2, 1}; // 转换成list List<String> nameList = Arrays.asList(name); L.

多态多态存在的必要条件（1）继承（2）重写（3）父类引用指向子类（如：Parent p = new Child();）当调用某方法时，先检查父类是否有该方法，如果有便调用子类中的该方法，否则报错public class Employee { private String name; private String address; private int number; public Employee(String name, String addres.