How to access List of elements of a Class type?

Question

I have an ArrayList that contains the below elements of type class: ListClass

public class ListClass {
    String requestPath;             //parse
    List<String> paramsMandatory;   //name, query
    List<String> paramsOptional;    //company
    boolean needBody;               //true
    String mimeType;                //String, json

    public String getRequestPath() {
        return requestPath;
    }
    public void setRequestPath(String requestPath) {
        this.requestPath = requestPath;
    }

    public List<String> getParamsMandatory() {
        return paramsMandatory;
    }
    public void setParamsMandatory(List<String> paramsMandatory) {
        this.paramsMandatory = paramsMandatory;
    }

    public List<String> getParamsOptional() {
        return paramsOptional;
    }
    public void setParamsOptional(List<String> paramsOptional) {
        this.paramsOptional = paramsOptional;
    }

    public boolean isNeedBody() {
        return needBody;
    }
    public void setNeedBody(boolean needBody) {
        this.needBody = needBody;
    }

    public String getMimeType() {
        return mimeType;
    }

    public void setMimeType(String mimeType) {
        this.mimeType = mimeType;
    }
}

Setting the properties of it in another class: PropSetter

public class PropSetter {
    List<String> mp = new ArrayList<String>();
    List<String> op = new ArrayList<String>();
    public void setParameters() {
        mp.add("force");
        mp.add("name");
        op.add("company");
        op.add("location");
        ListClass lc = new ListClass();
        lc.setRequestPath("/parse");
        lc.setParamsMandatory(mp);
        lc.setParamsOptional(op);
        lc.setNeedBody(false);
        lc.setMimeType("String");
        System.out.println("Set the props for ListClass");
    }

}

I am trying to return an ArrayList that is of Type: ListClass in the below way:

List<ListClass> cl = new ArrayList<ListClass>();    
public void setCL() {
    PropSetter ps  = new PropSetter();
    ps.setParameters();
    ListClass lcl  = new ListClass();
    cl.add(lcl);
}
public List<ListClass> getPropList() {
    return cl;
}

The method getPropList returns the List of type: ListClass . How do I access elements in it ? If it is a particular datatype, I could've used an Iterator or a foreach loop. But this is of a class type: ListClass which I dont understand how to access the elements, particularly the lists: paramsMandatory & paramsOptional inside.

I tried to display the elements like:

CreateList cl = new CreateList();
cl.setCL();
List<ListClass> ll = cl.getPropList();
System.out.println("Size of Arraylist<ListClass>:" + ll.size());
for (ListClass l: ll) { 
    System.out.println("DS: " + l);
}

In my main class, I tried to see if I can print a parameter inside as below.

for (ListClass l: ll) { 
    System.out.println("DS: " + l.getRequestPath);
}

which gives me a compilation error: getRequestPath cannot be resolved or is not a field I tried to print the size of array and it shows the right value:

System.out.println("Size of Arraylist<ListClass>:" + ll.size());
Size of Arraylist<ListClass>: 1

Could anyone let me know how can I access the elements coming from : getPropList

Answer 1

Look at the compiler error you are getting, namely:

getRequestPath cannot be resolved or is not a field

In other words, the compiler thinks that getRequestPath is a member of class ListClass - because you forgot to add parentheses so as to indicate to the compiler that getRequestPath is a method. Hence you need to change that line of your code as follows:

System.out.println("DS: " + l.getRequestPath());