homework: how to invoke a java method

Question

I have:

/* * File: NameSurferEntry.java * -------------------------- * This class represents a single entry in the database. Each * NameSurferEntry contains a name and a list giving the popularity * of that name for each decade stretching back to 1900. */ import acm.util.*; import java.util.*; public class NameSurferEntry implements NameSurferConstants { /* Constructor: NameSurferEntry(line) */ /** * Creates a new NameSurferEntry from a data line as it appears * in the data file. Each line begins with the name, which is * followed by integers giving the rank of that name for each * decade. */ public NameSurferEntry(String line) { findName(line); findDecades(line); } ...

as a class.

How would I call the method NameSurferEntry from within another class.

Well, thank you for tagging the question appropriately, but next time use a more descriptive title ;) — mpen
– mpen, Commented Dec 28, 2009 at 23:38
And in addition, you're going to want the calling class to be in the same folder as your NameSurferEntry class. — Roman
– Roman, Commented Dec 28, 2009 at 23:42

fforw · Accepted Answer · 2009-12-28 23:38:16Z

NameSurferEntry is a constructor, not a method. Creating a non-default constructor will hide the default empty constructor. So

// asume line to be a string containing a line NameSurferEntry entry = new NameSurferEntry(line);

will be the only way to create NameSurferEntry objects.

Kaleb Brasee · Accepted Answer · 2009-12-28 23:44:44Z

This method is a constructor -- it gets called when you create a new NameSurferEntry object and pass a String. You'd call it like this:

NameSurferEntry entry = new NameSurferEntry("some string");

You can tell it's a constructor because the return type is the same as the class name, and there's no method name. It's only callable when you're creating a new NameSurferEntry.

Mongoose · Accepted Answer · 2009-12-28 23:36:53Z

NameSurferEntry is the constructor of that class, which means it will be called every time you create a new instance of NameSurferEntry with the new operator. There is no other way to call this method.

mopoke · Accepted Answer · 2009-12-28 23:37:56Z

NameSurferEntry is the constructor of the class, so you'd do something like:

NameSurferEntry myObject = new NameSurferEntry("value");

Pat · Accepted Answer · 2009-12-28 23:37:46Z

That's a constructor. You'd call it in the following form:

NameSurferEntry newEntry = new NameSurferEntry("string goes here.");

Ritwik Bose · Accepted Answer · 2009-12-28 23:41:00Z

Apologies for before. I saw a phantom void in the constructor. as everyone else has pointed out, it should be

NameSurferEntry nsf = new NameSurferEntry(line);

Community · Accepted Answer · 2017-05-23 12:18:38Z

It is also possible to call a constructor from another constructor. See also this answer: How do I call one constructor from another in Java?

And, if you subclass your class, you can call it from the constructor in the subclass via a call to super().

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