how to initialize static ArrayList in one line

Question

i have MyClass as

MyClass(String, String, int);

i know about how to add to add to ArrayList in this way:

MyClass.name = \"N         


        

Answer 1

The "best" way to do this in an effective way would be to :

List list = new ArrayList();

 list.add(new MyClass("name", "address", 23));
 list.add(new MyClass("name2", "address2", 45));

although it requires a lot of typing but as you can clearly see this is more efficient

Another alternative would be to use google guava (not tested for efficiency):

ArrayList list = new ArrayList(
           new MyClass("name", "address", 23), 
           new MyClass("name2", "address2", 45) );

The required import is import static com.google.common.collect.Lists.newArrayList;

also, you can use double braces initialization as originally proposed by @Rohit Jain: -

List list = new ArrayList() {
    {
        add(new MyClass("name", "address", 23));
        add(new MyClass("name2", "address2", 45));
    }
};

As you can see that, inner braces is just like an initializer block, which is used to initialize the list in one go..

note the semi-colon at the end of your double-braces

also note the last method has some downsides as discussed here.