Solving void type java-CodePudding

I'm trying to create a code that gets the response:

Event recorded at 10:53, datum = 45

However, at the moment, I'm getting the output, 'java: 'void' type not allowed here', but I;m not too sure what I can add to the getEventTime and getEventDatum to make it valid.

class EventInformation{
    String eventTime;
    int eventDatum;
    EventInformation(String eventTime, int eventDatum){
        this.eventTime = eventTime;
        this.eventDatum = eventDatum;
    }
    public void getEventTime(){
        String getEventTime = eventTime;
    }

    public void getEventDatum(){
        int getEventDatum = eventDatum;

Here is the additional code from the main method:

EventInformation e = new EventInformation("10:53",45);
        System.out.println("Event recorded at "   e.getEventTime()  
                ", datum = "   e.getEventDatum());

Any help at all is greatly appreciated!

CodePudding user response：

void means that your method returns nothing, but you do want to return something - a String for getEventTime() and an int for getEventDatum(). Thus, your methods should look like this:

public String getEventTime() {
    return eventTime;
}

public int getEventDatum() {
    return eventDatum;
}

But you can use a better style:

What you are trying to achieve here is to convert an EventInformation to a String. Because converting any Object to a String to print it out is a common problem in java, there is a method toString() in the class Object, which you can override:

public class EventInformation {
    String eventTime;
    int eventDatum;

    EventInformation(String eventTime, int eventDatum){
        this.eventTime = eventTime;
        this.eventDatum = eventDatum;
    }

    public String toString() {
        return "Event recorded at "   eventTime  
            ", datum = "   eventDatum;
    }
}

Now, you can directly print out the EventInformation using

EventInformation e = new EventInformation("10:53",45);
System.out.println(e);

and java will take care of converting this EventInformation to a String using the toString() method.

The advantage is that you can now print an EventInformation from everywhere in your code without creating the String again there.

CodePudding user response：

If the method returns VOID it means that it does not return anything. Let's start with getters and setters java-getters-and-setters