Answer to your specific question Your code was checking all columns within any container, what you need to do is: Loop through each container Get the heights of each column within that container Find the highest one Apply that height to every column in that container before moving on to the next one. Note: Try … Read more
The string constant pool will essentially cache all string literals so they’re the same object underneath, which is why you see the output you do for s1==s2. It’s essentially an optimisation in the VM to avoid creating a new string object each time a literal is declared, which could get very expensive very quickly! With … Read more
In Java, == always just compares two references (for non-primitives, that is) – i.e. it tests whether the two operands refer to the same object. However, the equals method can be overridden – so two distinct objects can still be equal. For example: String x = “hello”; String y = new String(new char[] { ‘h’, … Read more
Yes, Resharper can do that. With cursor inside your type, open the “Generate code” menu (Alt+Ins depending on settings or Resharper -> Edit -> Generate Code), and select “Equality members”: This opens a window where you can select which members are used for equality, along with some options about the generated code (e.g. should your … Read more
Apache commons-collections has CollectionUtils#isEqualCollection: Returns true if the given Collections contain exactly the same elements with exactly the same cardinality. That is, if the cardinality of e in a is equal to the cardinality of e in b, for each element e in a or b. Which is, I think, exactly what you’re after.
Java 7.0 added a new handy class: Objects. It has a method exactly for this: Objects.equals(Object a, Object b)
The == operator compares the object references, not the value of the Strings. To compare the values of Strings, use the String.equals method: “231”.equals(parts[0]); This is true with any other object in Java — when comparing values, always use the equals method rather than using the == operator. The equals method is part of Object, … Read more
If Java 7+, use Objects.equals(); its documentation explicitly specifies that: […] if both arguments are null, true is returned and if exactly one argument is null, false is returned. Otherwise, equality is determined by using the equals method of the first argument. which is what you want. If you don’t, your method can be rewritten … Read more
There’s no need to call equals if hashCode differs. There’s no need to call hashCode if (obj1 == obj2). There’s no need for hashCode and/or equals just to iterate – you’re not comparing objects When needed to distinguish in between objects.
There’s a big difference between overloading == and overriding Equals. When you have the expression if (x == y) { The method that will be used to compare variables x and y is decided at compile time. This is operator overloading. The type used when declaring x and y is used to define which method … Read more