compareto Questions
4
Solved
@Override
public int compareTo(Object t)
{
if(t instanceof Student)
{
Student s = (Student)t;
return (this.name.compareTo(s.name));
}
else
return -1;
}
This is my compareTo method impleme...
4
Solved
I am writing a phonebook program in java and i need to list people in the list alphabetically and to do that i need to write a sorting algorithm for a list in java and it should use only compareTo(...
2
Trying to use Java's DelayQueue, I have to implement the Delayed interface which requires a compareTo() "method that provides an ordering consistent with its getDelay method.". The intention is of ...
Usurious asked 22/6, 2014 at 16:22
1
Solved
This code executes successfully in .NET 4.0
public void CompareTest()
{
var m1 = new Foo { Order = 1 };
var m2 = new Foo { Order = 2 };
var c1 = new Bar { Order = -1 };
var c2 = new Bar { Or...
Penrose asked 7/7, 2014 at 12:46
4
Solved
What should be returned in a CompareTo method when the given object is null?
The MSDN Library shows a example where 1 is returned. But I would have expected to throw an error because comparing to ...
1
Solved
I've been going over some Microsoft samples of code for the Kinect sensor and have stumbled across the following line.
TimeSpan zeroDuration = TimeSpan.FromSeconds(0.0);
TimeSpan timeRemaining = ....
1
Solved
In answering this question, I discovered the following behaviour of compare on discriminated unions.
type T = A | B | C | D
compare A B (* val it : int = -1 *)
compare A C (* val it : int = -2 *...
Pecten asked 14/3, 2014 at 22:52
2
I've been trying to override a compareTo in such a way:
This is the original:
@Override
public int compareTo(ProductPart6 s)
{
return this.getproductName().compareTo(s.getproductName());
}
thi...
Gompers asked 25/11, 2013 at 23:32
2
Solved
I am studying the source of the OpenJDK.
My attention was attracted by the methods Byte.compare() and Integer.compare():
public static int Byte.compare(byte x, byte y) {
return x-y;
}
public st...
4
Solved
I am implementing Comparable interface on a trivial class that wraps a single int member.
I can implement it this way:
@Override
public int compareTo ( final MyType o )
{
return
Integer.valu...
2
Solved
General question: When implementing an override of the default equals method in Java, what concerns should I have about simply utilizing an already implemented compareTo method vs writing independe...
4
Solved
I'm trying to generate a hashCode() method for my simple class but i'm not getting anywhere with it. I would appreciate any help. I've implemented the equals() method, which looks as follows, and w...
5
I'm well aware of the contractual needs to make sure that hashCode is consistent with equals and that equals is consistent with compareTo. However, this is often violated in practice. Are there any...
Carisa asked 8/3, 2012 at 20:1
1
like compareTo, that have to be "reflexive, antisymmetric and transitive", are there any rules to implement the compare method??
thanks
Decorum asked 6/2, 2013 at 15:24
5
I am beginner in java, I am trying to compare two strings in java char by char and find how many different chars they have by the following code but it doesn't work,
min is the min between the 2 ...
1
Solved
I posted some code here which correctly solved a problem the poster had. OP wanted to remove duplicates and bring certain special items to the top of a list. I used a TreeSet with a special Compara...
Handful asked 6/10, 2012 at 16:25
2
Solved
I am trying to sort an Android ListView object. I am currently using the following code:
// Sort terms alphabetically, ignoring case
adapter.sort(new Comparator<String>() {
public int com...
3
Solved
When compiling the code below, I get the following error:
PersonalInformation is not abstract and does not override abstract
method compareTo(Object) in Comparable
I assume that means I have...
Incapacity asked 20/2, 2012 at 14:21
3
Solved
I'm having a strange problem comparing strings. I send a string to my server (as bytes using getBytes()) from the client. I've ensured that encoding is the same on the client and server by starting...
Plaid asked 1/10, 2010 at 17:12
6
Solved
If I have a class Person that implements Comparable (compares personA.height to personB.height, for example), is it possible to use
personA < personB
as a substitute for
personA.compareT...
Noisette asked 20/1, 2012 at 18:25
2
Solved
I've been reading about using Collator and the compareTo method in String for comparing Strings. I'm unsure what the real difference is between the two from reading the API. When is one to prefer o...
3
Solved
I am trying to compare objects in an object[] that are of a single type (unknown at runtime). They are of System.string, int, decimal, Datetime, or bool types.
Is there a way to compare two of the...
5
Solved
I am clueless here...
1: private static class ForeignKeyConstraint implements Comparable<ForeignKeyConstraint> {
2: String tableName;
3: String fkFieldName;
4:
5: public int compareTo(...
6
Solved
Let's have a class Person. Person has a name and height.
Equals and hashCode() takes into account only name. Person is comparable (or we implement comparator for it, does not matter which one). Per...
Jorge asked 29/8, 2011 at 12:19
1
Solved
The following little test throws an NPE:
public class Test {
public static void main(String[] args) {
String a = "a";
String b = null;
System.out.println(a.compareTo(b));
}
}
Yet, the ...
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