CODEWITHSUNDEEP
javainner-classes
Salahin Rocky
Salahin Rocky

Reputation: 435

Why JDK7 not allow method local Inner Class to access its own method's local variables

class MyOuter2{
private String x;
void doStuff(){
    int mloc= 100;
    x ="Outer class variable";
    class MyInner{
        public void seeOuter(){
            System.out.println("Access both: " + x+" and " + mloc);
            System.out.println("Inner class ref is " + this);
            System.out.println("Outer class ref is " + MyOuter2.this);
        }
    }
    MyInner MethodInnerClass = new MyInner();
    MethodInnerClass.seeOuter();

  }
}

public class InnerClass {
   public static void main(String[] args) {
      MyOuter2 outer = new MyOuter2();
      outer.doStuff();
   }
}

In this code I use doStuff()'s variable mloc in method local MyInner Class my compiler compile this code and also run this code through JDK8.

Upvotes: 1

Views: 121

Answers (2)

Vivek Singh
Vivek Singh

Reputation: 11

In Java SE 8, a local class can access local variables and parameters of the enclosing block that are final or effectively final. A variable or parameter whose value is never changed after it is initialized is effectively final.

Upvotes: 1

Zaw Htoon
Zaw Htoon

Reputation: 69

Method-local inner class variable can access in Java 8, but not Java 7. I use java version "1.8.0_31", and it can compile. But it cannot compile in Java 7.

Upvotes: 0

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