Question

I have a class

public class MyMain{
    public static void main(String... arg){
            Temp t = new Temp(){
                {
                    System.out.println(" instance initialize");
                }
            };

        }
    }

class Temp{
    int i;

    {
        i=9;
        System.out.println("Static"+i);
    }
    Temp(){
        System.out.println("Temp const "+i);
    }
}

When i execute the main method the output comes:

Static9
Temp const 9
instance initialize

Ideally, the blocks are executed before the constructor, but the inline initialization block is called after the Constructor. Why?

Answer 1

You’re creating a subclass of Temp. For each class, any instance initializers are executed before the constructor body – but the superclass goes through initialization before the subclass initialization. So the execution flow is:

• Initializers in Object
• Constructor body in Object
• Initializers in Temp
• Constructor body in Temp
• Initializers in anonymous class
• Constructor body in anonymous class (none)

I would strongly advise you to refactor any code which looked like this anyway – aim for clarity rather than cleverness.