Please can somebody help me? I’m learning about Array List in Java, I found interesting things in this lesson (Stanford CS106a)
https://www.youtube.com/watch?v=YJ9FlCFi3c8&feature=youtu.be&list=PL84A56BC7F4A1F852&t=1385
But when I tried to run this program in Eclipse it gives me many errors 🙁
What’s wrong with this? (Why is void invalid type for the variable printList?)
import java.util.ArrayList;
import acm.program.*;
class ArrayListEx extends ConsoleProgram {
public void run () {
ArrayList<String> sList = new ArrayList <String>();
readList (sList);
printList (sList);
readList (sList);
printList (sList);
private void readList (ArrayList list) {
while (true) {
String line = readLine("Unesi tekst");
if (line.equals("")) break;
list.add(line);
}
}
private void printList (ArrayList lista) {
println ("List contains: " + lista.size() + " elements.");
for (int i = 0; i< lista.size(); i++) {
println(lista.get(i));
}
}
}
}
Answer
The issue was no } bracket on your run function and an extra } at the end of your printList function. Also have changed run() to init(). This should hopefully work for you.
import java.util.ArrayList;
import acm.program.*;
public class ArrayListEx extends ConsoleProgram {
public void init () {
ArrayList<String> sList = new ArrayList <String>();
readList (sList);
printList (sList);
readList (sList);
printList (sList);
}
private void readList (ArrayList list) {
while (true) {
String line = readLine("Unesi tekst");
if (line.equals("")) break;
list.add(line);
}
}
private void printList (ArrayList lista) {
println ("List contains: " + lista.size() + " elements.");
for (int i = 0; i< lista.size(); i++) {
println(lista.get(i));
}
}
}