Pass array with a string and int to another class

Question

I am new to Java and I have failed to find anything about this case.

I am basically trying to pass this array called vakken to a new class called Vak, Vak expects to receive a String and a int.

        Vak[] vakken = new Vak[1];
        vakken[0] = new Vak("Test",3);

        Vak vak = new Vak(vakken[0]);

Whenever I try the code above I get this error.

Exception in thread "main" java.lang.UnsupportedOperationException: Not supported yet.
at ectsmonitor2.Vak.<init>(Vak.java:24)
at ectsmonitor2.ECTSmonitor2.main(ECTSmonitor2.java:27)
Java Result: 1

Vak.class

public class Vak {
    public String naam;        
    public int teVerdienenEcts; 

    public Vak(String vakNaam, int vakTeVerdienenEcts){
        naam  = vakNaam;
        teVerdienenEcts = vakTeVerdienenEcts;
    }
}

On a side note, public fields are usually not a good idea. See encapsulation. — m0skit0
– m0skit0, Commented Oct 23, 2014 at 18:45

bcsb1001 · Accepted Answer · 2014-10-23 18:42:24Z

7

You haven't actually coded your constructor that takes a Vak yet, you made it throw UnsupportedOperationException. Put some code in the constructor e.g.

public Vak(Vak v) {
    this(v.naam, v.teVerdienenEcts);
}

answered Oct 23, 2014 at 18:42

bcsb1001

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1 Comment

DoubleDouble Over a year ago

To add to this answer - if OP is trying to simply retrieve the Vak from the array for some reason (and not create a new one) he should write Vak vak = vakken[0];

Nabin · Accepted Answer · 2014-10-23 18:43:34Z

1

This line wont work for sure

 Vak vak = new Vak(vakken[0]);//IDE will display error message here

Because you have no such constructor for this.

Create a new constructor that takes an object of its own type.

Similar to this:

public Vak(Vak anObject){
//do stuffs here
}

These type of constructors are called copy constructors

And generally you won't want your attributes to be public. Make them private.

answered Oct 23, 2014 at 18:43

Nabin

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