static void Test2(PersonTest p, int i)
{
p.Name = "zzz";
i = 100;
}
static void Test3(ref PersonTest p, ref int i)
{
p = new PersonTest();
p.Name = "ttt";
i = 100;
}
static void Main(string[] args)
{
////4密闭类和静态类及扩展方法（静态方法）
//Person p1 = new Person();
//p1[1, 2] = "abc";
//string result = p1[3, 5];
//Console.WriteLine(result);
Console.WriteLine("----------------");
Dog d1 = new Dog();
d1["wangwang"] = 12;
int resultDog = d1["hahaha"];
Console.WriteLine(resultDog);
//Console.WriteLine("*****@*****.**".IsEmail());
//Console.WriteLine("ABC".Repeat(10));
////等价于Console.WriteLine(Helper.Repeat("ABC",5));
////5深copy和浅copy
//PersonTest p1 = new PersonTest();
//p1.Name = "ABC";
//p1.Age = 10;
//PersonTest p2 = p1;//让p2指向当前p1对象 只有一个对象
//PersonTest p3 = new PersonTest(); //复制了一份 两个对象，互相不影响
//p3.Name = p1.Name;
//p3.Age = p1.Age;
//PersonTest p4 = new PersonTest();
//p4.Name = "abc";
//p4.Age = 3;
//DogTest dog1 = new DogTest();
//dog1.Name = "wangcai";
//p4.dog = dog1;
//PersonTest p5 = new PersonTest();
//p5.Name = p4.Name;
//p5.Age = p5.Age;
//p5.dog = p4.dog;//浅copy
//DogTest dog2 = new DogTest();//深copy
//dog2.Name = dog1.Name;
//p5.dog = dog2;
////6结构体、值类型及引用类型
//DogTest objDog1 = new DogTest();
//objDog1.Name = "aaa";
//DogTest objDog2 = objDog1;
//objDog1.Name = "bbb";
//Console.WriteLine(objDog2.Name);
//DogStruct objdog1s = new DogStruct();
//objdog1s.Name = "aaa";
//DogStruct objdog2s = objdog1s;
//objdog1s.Name = "bbb";
//Console.WriteLine(objdog2s.Name);
//int[] nums = { 1, 3, 5, 7, 9 };
//Test(nums);
//Console.WriteLine(nums[1]);
////9关于相等
//DogTest dog1 = new DogTest();
//dog1.Name = "wangwang";
//DogTest dog2 = dog1;
//DogTest dog3 = new DogTest();
//dog3.Name = "wangwang";
//DogTest dog4 = new DogTest();
//dog4.Name = "wangwang";
//Console.WriteLine(object.ReferenceEquals(dog1,dog2));
//Console.WriteLine(object.ReferenceEquals(dog1, dog3));
//Console.WriteLine(dog1.Equals(dog4));//重载Equal方法
//Console.WriteLine(dog1==dog4);//重载==运算符和!=运算符
//Console.WriteLine(dog1==dog2);
//Console.WriteLine(dog1==dog3);
//string s1 = "abc";
//string s2 = s1;
//string s3 = new string(new char[] { 'a','b','c'});
//Console.WriteLine(object.ReferenceEquals(s1,s2));
//Console.WriteLine(object.ReferenceEquals(s1,s3));
//Console.WriteLine(s1==s2);
//Console.WriteLine(s1==s2);
////10字符串缓冲池
//string s1 = "abc";
//string s2 = "abc";
//string s3 = "a" + "b" + "c";
//string s4 = new string(new char[] { 'a', 'b', 'c' });
//Console.WriteLine(object.ReferenceEquals(s1, s2));
//Console.WriteLine(object.ReferenceEquals(s1, s3));
//Console.WriteLine(object.ReferenceEquals(s1, s4));
//ref和out关键字
PersonTest p = new PersonTest();
p.Name = "abc";
int i = 5;
Test2(p, i);//引用类型和值类型在方法内部传参调用时的不同
Console.WriteLine(p.Name);
Console.WriteLine(i);
Test3(ref p, ref i);
Console.WriteLine(p.Name);
Console.WriteLine(i);
int ii;
Test4(out ii);
Console.WriteLine(ii);
Console.ReadLine();
}
