IOS中的swift和oc关于对象模型的description方法重写

先讲OC的，oc比较重要，放在最前面.
首先创建一个cocoa Touch Class，继承NSObject, 命名Person
点h文件写几个属性
#import <Foundation/Foundation.h>
@interface AHLJPerson : NSObject
@property(nonatomic,copy)NSString * name;
@property(nonatomic,assign)int age;
@property(nonatomic,assign)double height;
@end

重写description方法

• -(NSString *)description
  {
  return [NSString stringWithFormat:@"<%p %@,{name: %@,age: %d,height: %f}>",self, [self class],self.name,self.age,self.height ];
  }
  书写的格式较多，我认为这种格式较规范，描述的也清楚.
  重写触摸屏幕事件
• -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
  AHLJPerson *p1 = [[AHLJPerson alloc] init];
  p1.name = @“jack”;
  p1.age = 18;
  p1.height = 178;
  AHLJPerson *p2 = [[AHLJPerson alloc] init];
  p2.name = @“rose”;
  p2.age = 19;
  p2.height = 160;
  NSLog(@"%@",p1);
  NSLog(@"%@",p2);
  }
  控制台打印内容

2021-10-18 13:29:55.553929+0800 decriptionTest[9278:202074] <0x600002a757c0 AHLJPerson,{name: jack,age: 18,height: 178.000000}>
2021-10-18 13:29:55.554015+0800 decriptionTest[9278:202074] <0x600002a757e0 AHLJPerson,{name: rose,age: 19,height: 160.000000}>

swift的description方法;

import UIKit
class UserAccount: NSObject {
   @objc var access_token: String?
   @objc  var expires_in: TimeInterval = 0
   @objc var uid: String?
   init(dict: [String: NSObject]){
        super.init()
        //KVC
        self.setValuesForKeys(dict)
    }
    override var description: String{
        let keys = ["access_token","expires_in","uid"]//数组
        return dictionaryWithValues(forKeys: keys).description
    }
}

日志:

["access_token": 2.11tI789pF0l1kIyhfdsf1c55clskLbD, "expires_in": 15764579999, "uid": 5564567845699]

顺带把java的也说一下，
java一般重写toString方法，alt + insert键 可以重写，苹果电脑idea的快捷键是cmd + N，为了返璞归真，我这里没有使用Lombok,而是使用原生的方法

package com.example.demo.pojo;
public class Person {
    private String name;
    private int age;
    private  double height;
    public  Person(){}
    public Person(String name, int age, double height) {
        this.name = name;
        this.age = age;
        this.height = height;
    }
    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", height=" + height +
                '}';
    }
}

我用junit测试的,也可以使用静态的main方法测试

@Test
    void contextLoads() {
        Person p1 = new Person("jack",18,178);
        Person p2 = new Person("rose",17,178);
        System.out.println(p1);
        System.out.println(p2);
        System.out.println(p1.getClass());
        System.out.println(p1.hashCode());
        System.out.println(p2.hashCode());

    }

日志:

Person{name='jack', age=18, height=178.0}
Person{name='rose', age=17, height=178.0}
class com.example.demo.pojo.Person
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