Collections - Beginning Java 8 Language Features - page 520

■ the toString() method of the list (and all types of collections) returns a comma-separated list of elements
enclosed in brackets. if a collection is empty, an empty pair of brackets ( [] ) is returned. the string is very useful for
debugging purposes, provided each element has a reasonable toString() implementation.

Tip

Listing 12-1. Using a List to Store Names

// NamesList.java
package com.jdojo.collections;

import java.util.ArrayList;
import java.util.List;

public class NamesList {
public static void main(String[] args) {
// Create a list of strings
List<String> names = new ArrayList<>();

// Print the list details
System.out.printf("After creation: Size = %d, Elements = %s%n",
names.size(), names);
// Add some names to the list
names.add("Ken");
names.add("Lee");
names.add("Joe");
// Print the list details
System.out.printf("After adding 3 elements: Size = %d, Elements = %s%n",
names.size(), names);

// Remove Lee from the list
names.remove("Lee");

// Print the list details
System.out.printf("After removing 1 element: Size = %d, Elements = %s%n",
names.size(), names);
// Clear all elements
names.clear();
// Print the list details
System.out.printf("After clearing all elements: Size = %d, Elements = %s%n",
names.size(), names);
}
}