Removing Strings from Arrays using a submethod JAVA

Question

I need to use the method "remove" that accepts an ArrayList of Strings and a target String as two parameters, and searches and deletes all matched Strings from the ArrayList. For example, calling remove on the ArrayList [“Go”, “Go”, “Go”] and the target String “Go”, would result in an empty ArrayList.

public class Remove {
    public static void main (String [] args) {
        ArrayList<String> x = new ArrayList<>();  
        x.add("Go");
        x.add("Go");
        x.add("Go");
        System.out.println(x);
        remove("Go");
        System.out.println(x);
    }

    public static void remove(String t) {
        ArrayList<String> x = new ArrayList<>();
        for(int i = 0; i < x.size(); i++) {
            if(x.get(i).equals(t)) {
                x.remove(i);
                i--;
            }
        }
    }
}

that accepts an ArrayList of Strings and a target String as two parameters: does your remove method respect these requirements? I only see one parameter. — JB Nizet
– JB Nizet, Commented Sep 14, 2018 at 20:25
x is empty. Did you mean to pass the x from the main method as a parameter? — Andy Turner
– Andy Turner, Commented Sep 14, 2018 at 20:26

Mureinik · Accepted Answer · 2018-09-14 20:31:49Z

2

The remove method creates a new ArrayList and then attempts to remove a value from it. Instead, you should pass a list to the method. Additionally, using JDK 8's removeIf method would make your code much simpler:

public static void main (String [] args) {
    List<String> x = new ArrayList<>();  
    x.add("Go");
    x.add("Go");
    x.add("Go");
    System.out.println(x);
    remove(x, "Go");
    System.out.println(x);
}

public static void remove(List<String> list, String t) {
    list.removeIf(s -> s.equals(t));
}

edited Sep 14, 2018 at 20:31

answered Sep 14, 2018 at 20:29

Mureinik

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