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I have a simple java method where i pass in an ArrayList of custom objects, and get their value, add them together and return them. I tried iterating with a foreach loop and a traditional loop, but it just returns 0.

public static int samletBeløb(ArrayList<Bruger> brugere) {
    int samletBeløb = 0;
    for (int i = 0; i < brugere.size(); i++) {
        Bruger bruger =brugere.get(i);
        int value = bruger.getBeløbGivet();
        value += samletBeløb;
    }

    return samletBeløb;
}

I have made sure, that the Object values are not null, and when i debugged the program it looped through properly, however no value was added.

You are not changing the samletBeløb variable.

Change your code to:

public static int samletBeløb(ArrayList<Bruger> brugere) 
{
    int samletBeløb = 0;
    for (int i = 0; i < brugere.size(); i++) {
        samletBeløb += brugere.get(i).getBeløbGivet();
    }

    return samletBeløb;
}

BTW, using Java 8 Streams can reduce this method to a single line:

public static int samletBeløb(ArrayList<Bruger> brugere) 
{
    return brugere.stream().mapToInt(Bruger::getBeløbGivet).sum();
}

Object.values(), The Object.values() method returns an array of a given object's own enumerable property (The only difference is that a forin loop enumerates properties in the prototype chain as well.) is property which isn't enumerable const my_obj = Object.create({}, { getFoo: { value: function() { return this.foo; } } })  Make sure to declare a method’s return type in its method declaration.   You can use the return statement to return the value within the body of the method. Any method declared void doesn’t return a value. Meanwhile, it does not require to contain a return statement, but if you wish to put you can.

This is because you are not adding each value to samletBeløb variable. Change your code to:

public static int samletBeløb(ArrayList<Bruger> brugere) {
        int samletBeløb = 0;
        for (int i = 0; i < brugere.size(); i++) {
            Bruger bruger =brugere.get(i);
            int value = bruger.getBeløbGivet();
            samletBeløb += value;
        }

        return samletBeløb;
}

The Method Declaration, What is the return type of a method that does not return any value? Passing and Returning Objects in Java. Although Java is strictly pass by value, the precise effect differs between whether a primitive type or a reference type is passed. When we pass a primitive type to a method, it is passed by value. But when we pass an object to a method, the situation changes dramatically,

It because you are adding up in value but returning samletBeløbalways which is initialised as 0 so iits giving you always a 0; try this code:

public static int samletBeløb(ArrayList<Bruger> brugere) {
    int value = 0;
    for (int i = 0; i < brugere.size(); i++) {
        Bruger bruger =brugere.get(i);
          value += brugere.get(i).getBeløbGivet();

    }

    return value;
}

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Returning a Value from a Method (The Java™ Tutorials > Learning , Problem that I am getting is, when I use the console.log, it is returning me undefined. to show all the data of my objects through this function..but its not working to show all values in each key of object..but maybe I am not performing it right? TRUE/FALSE: Two general categories of methods are void methods and value returning methods. TRUE/FALSE: In the method header, the method modifier public means that the method belongs to the class, not a specific object. TRUE/FALSE: Constants, variables, and the values of expressions may be passed as arguments to a method.

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Comments
  • Please, don't use special characters in the variable names, such as ø. I recommend you to stick with the English naming.
  • show up your bruger class!!
  • Is using streams best practise, when looping through objects like this?
  • @kristheman Once you get used to the syntax, using streams can make your code shorter and more readable, but It's a matter of opinion.
  • Instead of Iterating each item stream API had some better solution to do the same task. As per your suggestion for loop iterating n time and n time var value init so n*n time complexity. So batter to use stream API like brugere.stream().mapToInt(Bruger::getBeløbGivet).sum();