CODEWITHSUNDEEP
java
user2392631
user2392631

Reputation: 507

static block inside static inner class

we know that a static block in java is resovled while compliling, not at runtime. Hence again We know that a static inner class is instantiated during the first call to the nested class. Now suppose the nested class is having a static block. So, in that case can we say that static block inside the nested class will be resolved when the first attempt to access that nested class is made? Sample code:

public class A
{
public static class B
{
  static A a;
 static
 {
   a=new A();
 }

 public static A getA()
{
   return a;
 }
}
}

Now I am accessing as: A a= A.b.getInstance(); I hope at that point only static block in B will be executed and not before that.

Upvotes: 0

Views: 1378

Answers (3)

Sajan Chandran
Sajan Chandran

Reputation: 11487

From jls Compile time error will happen from static blocks only when

If a static initializer cannot complete normally.

If a return statement appears anywhere within a static initializer.

If the keyword this or the keyword super or any type variable declared outside the static initializer, appears anywhere within a static initializer.

static block will be executed when the class is initialized, so in your example, the static block inside your static class B will get executed first.

Upvotes: 0

sp00m
sp00m

Reputation: 48817

This should answer your question:

public class Test {

    public Test() {
        System.out.println("Test instantiated");
    }

    public static class Inner {

        static {
            System.out.println("Static block executed");
        }

        public Inner() {
            System.out.println("Test.Inner instantiated");
        }

    }

}

When calling:

Test test = new Test();
Test.Inner inner = new Test.Inner();

We get:

Test instantiated
Static block executed
Test.Inner instantiated

Upvotes: 4

NimChimpsky
NimChimpsky

Reputation: 47290

static block in java is resovled while compliling

No it isn't.

All static code is resolved once by the classloader, when loaded/initalized.

Upvotes: 1

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