object | 易学教程

How to diff Property Values of two objects using GetType GetValue?

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问题 I have the following classes: public class Person { public String FirstName { set; get; } public String LastName { set; get; } public Role Role { set; get; } } public class Role { public String Description { set; get; } public Double Salary { set; get; } public Boolean HasBonus { set; get; } } I want to be able to automatically extract the property value diferences between Person1 and Person2, example as below: public static List<String> DiffObjectsProperties(T a, T b) { List<String>

Discovering the best approach to storing a specific object-oriented data structure

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问题 After some fantastic suggestions, and a sleepless night of excitement due to the possibility of finally having a solution to my problem, I realize that I'm still not quite at a solution. So, I am here to outline my problem in much more detail in hope that someone knows of the best way to achieve this. To recap (if you haven't read the previous post): I am constructing a PHP OOP framework from scratch (I have no choice in this matter) The framework is required to handle object-oriented data in

Object.fromEntries

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//数组转换成对象 const arr = [['foo', 1],['bar', 2]] const obj = Object.fromEntries(arr) console.log(obj.bar) //找出key的长度为3的值 const obj = { abc: 1, def: 2, ghewe: 3 } let res = Object.fromEntries( Object.entries(obj).filter(([key, val]) => key.length === 3) ) console.log(res) 来源： https://www.cnblogs.com/qjb2404/p/12232278.html

250 浅拷贝Object.assign(target, ...sources)，深拷贝

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浅拷贝：Object.assign(target, ...sources)。 **Object.assign()** ：方法用于将所有可枚举属性的值从一个或多个源对象复制到目标对象，它将返回目标对象。  <script> var arr = ['pink', 'red', 666] for (var k in arr) { console.log(k); // 0 1 2 console.log(arr[k]); // pink red 666 } </script>  <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <script> // 浅拷贝只是拷贝一层, 更深层次对象级别的只拷贝引用. // 深拷贝拷贝多层, 每一级别的数据都会拷贝. var obj = { id: 1, name: 'andy'

JavaScript的类和继承

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本文参考了两本书： <JavaScript: The Good Parts>（JSTGP） by Douglas Crockford <JavaScript Web Application> (JSWA) by maccman 如何在JavaScript中使用”类“，W3CSHOOL提供了一个貌似不错的解决方案，也就是所谓的PseduoClassical范式： var Person = function (opt) { opt = opt ? opt : {}; this.name = opt.name; }; Person.prototype.hello = function() { console.log("hello, I'm " + this.name); }; var Programmer = function (opt) { opt = opt ? opt : {}; Person.apply(this, arguments); this.language = opt.language; }; Programmer.prototype = new Person(); Programmer.prototype.coding = function() { console.log("I'm coding with " + this.language); }; var lucy

Get selected Object from Combobox

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问题 I have this Combobox filled with objects And Upon selecting a certain object from the combobox I would like to show Text in a Textbox , but for some reason I can't get my selection through. This is what is in my combobox : private void showBirds() { cboBirds.Items.Clear(); foreach (Bird b in Bird.ReadBirdCSV(txtFile.Text)) { cboBirds.Items.Add(b); } } It basically shows the names of birds from the Objects Bird. private void cboBirds_SelectionChanged(object sender, SelectionChangedEventArgs e)

Deeply self reference an object's properties

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问题 Is it possible to deeply self reference within a JS object? I know it is possible to self reference at the same level, like so: var foo = { a: 'bar', b: 'baz', c: () => { return this.a + this.b; } }; console.log(foo.c()); // barbaz I'm just curious if it would be possible to do so from deeper down... var foo = { a: 'bar', b: 'baz', c: { ca: 'hello', cb: () => { return this.a + this.b; } } }; console.log(foo.c.cb()); // barbaz If not... How would one go about getting this to work? 回答1: One

jvisualvm定位JVM内存溢出，死锁，分析GC日志

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OOM定位创造一个会OutOfMemoryError的程序 import java . util . LinkedList ; import java . util . List ; public class OutOfMemoryDump { /** * JVM 参数 * -Xms10m -Xmx10m -XX:+PrintGCDetails -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/Volumes/mac */ public static void main ( String [ ] args ) { List < Byte [ ] > bytes = new LinkedList < > ( ) ; while ( true ) { Byte [ ] byteNew = new Byte [ 1024 ] ; bytes . add ( byteNew ) ; } } } 运行时添加虚拟机运行参数： - Xms10m - Xmx10m - XX : + PrintGCDetails - XX : + HeapDumpOnOutOfMemoryError - XX : HeapDumpPath = / Volumes / mac / oomdump . dump 然后可以在/Volumes/mac

Java多线程-7-死锁

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七、死锁 1、问题引出 class DeadLock { private final Object LOCK_A = new Object ( ) ; private final Object LOCK_B = new Object ( ) ; public void methodA ( ) { synchronized ( LOCK_A ) { try { Thread . sleep ( 1000 ) ; } catch ( InterruptedException e ) { e . printStackTrace ( ) ; } System . out . println ( Thread . currentThread ( ) . getName ( ) + "获取锁A，尝试获取锁B" ) ; synchronized ( LOCK_B ) { } } } public void methodB ( ) { synchronized ( LOCK_B ) { try { Thread . sleep ( 1000 ) ; } catch ( InterruptedException e ) { e . printStackTrace ( ) ; } System . out . println ( Thread . currentThread ( ) . getName

java8 object源码

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Object类中大部分都是用 native 修饰的方法这个关键字修饰的方法底层是c/c++编写的程序编译后dll文件，java加载dll文件后，可用通过本地方法调用dll中函数. public class Object { //非native方法 public boolean equals(Object obj) { return (this == obj); } public String toString() { return getClass().getName() + "@" + Integer.toHexString(hashCode()); } //虽然不是native方法但是最终都调用了native方法 public final void wait(long timeout, int nanos) throws InterruptedException { if (timeout < 0) { throw new IllegalArgumentException("timeout value is negative"); } if (nanos < 0 || nanos > 999999) { throw new IllegalArgumentException("nanosecond timeout value out of range"); } if