Quick Java Tips - List conversions
Here are some quick Java tips. This is based on my recent code reviews.
1. How to convert HashMap keys to an ArrayList?
new ArrayList(map.keySet());
2. How to convert an Array to an ArrayList?
new java.util.ArrayList(java.util.Arrays.asList(array));
3. How to create and initialize a List in one step?
java.util.List = java.util.Arrays.asList(new String[] {”1″, “2″});
