摘要:
1.多态:具有表现多种形态的能力的特征 父类: public abstract class Animal { public abstract void Say();} 子类: public class Dog extends Animal { @Override public void Say() 阅读全文
摘要:
class Class1 { public String id { get; set; } public string name { get; set; } public string age { get; set; } public string PF { get; set; } public s 阅读全文