equals

I was learning hashcode in more depth and figured that: 1. If you override equals(), you must override hashcode() too. 2. To find if 2 objects are same object, use == operator Given those 2 factors, in Java I was assuming that when == operator is used to compare if 2 instances are same or not, if(object1 == object2) is actually doing if(object1.hashcode() == object2.hashcode()) But it appears I was wrong by running the test below. public class Main { public static void main(String[] args){ Obj1 one = new Obj1(); Obj1 two = new Obj1(); //is this calling hashCode() in backend??? if(one == two) {

I am using LINQ to search through one of my Entity Framework tables and find a "group" based on the name. The name is a string and appears to be Unicode (says it is in the edmx). I have a method GetGroup() and I pass in a name to search for. Debugging through the code, I already have a group named "Test" in my database. Once I pass in a group named "TEST" I expect it to return the "Test" which was already in the database. It for some reason, does not find the "Test" and thinks "TEST" doesn't exist. Here is my query, I cannot see why it does not work. Please help. "name" is the passed in the

Ok, I have heard from many places and sources that whenever I override the equals() method, I need to override the hashCode() method as well. But consider the following piece of code package test; public class MyCustomObject { int intVal1; int intVal2; public MyCustomObject(int val1, int val2){ intVal1 = val1; intVal2 = val2; } public boolean equals(Object obj){ return (((MyCustomObject)obj).intVal1 == this.intVal1) && (((MyCustomObject)obj).intVal2 == this.intVal2); } public static void main(String a[]){ MyCustomObject m1 = new MyCustomObject(3,5); MyCustomObject m2 = new MyCustomObject(3,5);

I'm working on a C# project on which, until now, I've used immutable objects and factories to ensure that objects of type Foo can always be compared for equality with == . Foo objects can't be changed once created, and the factory always returns the same object for a given set of arguments. This works great, and throughout the code base we assume that == always works for checking equality. Now I need to add some functionality that introduces an edge case for which this won't always work. The easiest thing to do is to overload operator == for that type, so that none of the other code in the

I want to set equal height for divs with jQuery. All the divs may have different amount of content and different default height. Here is a sample of my html layout: <div class="container"> <div class="column">This is<br />the highest<br />column</div> <div class="column">One line</div> <div class="column">Two<br />lines</div> </div> <div class="container"> <div class="column">One line</div> <div class="column">Two<br>lines</div> <div class="column">One line</div> </div> I'm setting the height with the next jQuery function: $(document).ready(function(){ var highestBox = 0; $('.container .column