equals

Difference between the “ceq” MSIL command and object.InternalEquals

由 十年热恋 提交于 2020-06-25 05:11:20
问题 I was digging around in ILDASM and Reflector as found that: == is compiled to the "ceq" MSIL command object.Equals is left as is object.Equals calls object.InternalEquals This question showed me how to find out how InternalEquals might be implemented i.e. in .cpp class (or whatever, somewhere in the CLR). My question is: What does ceq become? Another method in a different .cpp class? I.e. they are completely different peices of code? So although the default behaviour of == and Equals appears

Overriding hashCode() and equals() methods

由 邮差的信 提交于 2020-05-17 03:09:49
问题 I override both the hashCode() and equals(), but I don't modify anything inside the overridden methods . @Override public int hashCode() { int hash = 7; hash = 67 * hash + Objects.hashCode(this.model); hash = 67 * hash + this.year; return hash; } @Override public boolean equals(Object obj) { if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } final PC other = (PC) obj; if (!Objects.equals(this.model, other.model)) { return false; } if (this.year != other

C# Using Equals method in a generic list fails

由 旧街凉风 提交于 2020-05-13 17:57:26
问题 I have a project where I have class State which uses templates. I have a class Cell, and I use it as State, so State holds a Cell as genericState. Now I have a generic function which checks if two instances are equal. Problem is, it never leaves the State Equals method to Cell Equals method. public class State<T> { public T genericState; //in my case T is a cell public State(T cellState) // CTOR { this.genericState = cellState; } public override bool Equals(object obj) { return genericState

C# Using Equals method in a generic list fails

由 北城以北 提交于 2020-05-13 17:56:22
问题 I have a project where I have class State which uses templates. I have a class Cell, and I use it as State, so State holds a Cell as genericState. Now I have a generic function which checks if two instances are equal. Problem is, it never leaves the State Equals method to Cell Equals method. public class State<T> { public T genericState; //in my case T is a cell public State(T cellState) // CTOR { this.genericState = cellState; } public override bool Equals(object obj) { return genericState

Can you compare multiple variables to see if they all equal the same value in JS?

由 天涯浪子 提交于 2020-04-27 06:19:28
问题 Working in Javascript, I am trying to see if 5 different variables all contain the same value at a given time. The value could be 1 of 6 things, but I need to see if they are all the same regardless of which value it is. I have tried this: if (die1 == die2 & die1 == die3 & die1 == die4 & die1 == die5) { yahtzeeQualify == true; } and this: if (die1 == die2 == die3 == die4 == die5) { yahtzeeQualify == true; } Are either of these valid? If so, there is probably an error in my code somewhere else

SQLite - Difference between IS and = (equals) in WHERE clause. (using JDBC PreparedStatement)

由 不打扰是莪最后的温柔 提交于 2020-04-11 12:42:47
问题 Edit: talking with a_horse_with_no_name I found that "IS" is a little bit different in SQLite allowing comparisons between NULL and values using "IS": stackoverflow.com/a/9102445/1470058. This clears up a lot of confusion for me. Thanks: The IS and IS NOT operators work like = and != except when one or both of the operands are NULL. In this case, if both operands are NULL, then the IS operator evaluates to 1 (true) and the IS NOT operator evaluates to 0 (false). If one operand is NULL and the

Java对象的equals,hashCode方法

由 我与影子孤独终老i 提交于 2020-02-29 03:18:58
今天下午研究了半天hashcode()和equals()方法，终于有了一点点的明白，写下来与大家分享（zhaoxudong 2008.10.23晚21.36）。 1. 首先equals()和hashcode()这两个方法都是从object类中继承过来的。 equals()方法在object类中定义如下： public boolean equals(Object obj) { return (this == obj); } 很明显是对两个对象的地址值进行的比较（即比较引用是否相同）。但是我们必需清楚，当String 、Math、还有Integer、Double。。。。等这些封装类在使用equals()方法时，已经覆盖了object类的equals（）方法。比如在String类中如下： public boolean equals(Object anObject) { if (this == anObject) { return true; } if (anObject instanceof String) { String anotherString = (String)anObject; int n = count; if (n == anotherString.count) { char v1[] = value; char v2[] = anotherString.value;

equals() vs compareTo() in Comparator/able (Theoretical)

由 我的未来我决定 提交于 2020-02-28 07:35:06
问题 I don,t understand Javadoc: The natural ordering for a class C is said to be consistent with equals if and only if (e1.compareTo((Object)e2) == 0) has the same boolean value as e1.equals((Object)e2) for every e1 and e2 of class C. Why should be that way? I understand that e1.equals(e2)=true should always imply e1.compareTo(e2)==0, but I cannot understand why the opposite should be true. Compareness is not equalness! 2 equal objects should be compared to zero, but 2 differents ones should be

String.equalsIgnoreCase - UpperCase v. LowerCase

由 对着背影说爱祢 提交于 2020-02-26 08:04:08
问题 I was browsing through the openjdk and noticed a weird code path in String.equalsIgnoreCase, specifically the method regionMatches: if (ignoreCase) { // If characters don't match but case may be ignored, // try converting both characters to uppercase. // If the results match, then the comparison scan should // continue. char u1 = Character.toUpperCase(c1); char u2 = Character.toUpperCase(c2); if (u1 == u2) { continue; } // Unfortunately, conversion to uppercase does not work properly // for

Java Compare 2 integers with equals or ==?

由 岁酱吖の 提交于 2020-02-11 14:14:32
问题 i am very very new to Java and i would like to know how can i compare 2 integers? I know == gets the job done.. but what about equals? Can this compare 2 integers? (when i say integers i mean "int" not "Integer"). My code is: import java.lang.*; import java.util.Scanner; //i read 2 integers the first_int and second_int //Code above if(first_int.equals(second_int)){ //do smth } //Other Code but for some reason this does not work.. i mean the Netbeans gives me an error: "int cannot be
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