Calling a method inside another method in same class

Question

In page 428  the chapter about Type Information  of his  Thinking In Java  4th Ed    Bruce Eckel has the following example   public class Staff extends ArrayList lt Position gt        public void add String title  Person person            add new Position title  person             rest of code snipped      Maybe I m a bit tired  but I can t see how the call to add   inside the add   method works  I keep thinking that it should have a reference  or be a static method  and I can t find a static add   in ArrayList or List   What am I missing   I just tested for myself  and found that this works      Test2 java public class Test2       public void testMethod             testMethod2               public void testMethod2             System out println  Here               public static void main String   args            Test2 t   new Test2            t testMethod

User · Accepted Answer

Java implicitly assumes a reference to the current object for methods called like this. So

// Test2.java
public class Test2 {
    public void testMethod() {
        testMethod2();
    }

    // ...
}

Is exactly the same as

// Test2.java
public class Test2 {
    public void testMethod() {
        this.testMethod2();
    }

    // ...
}

I prefer the second version to make more clear what you want to do.

User · Answer

The add method that takes a String and a Person is calling a different add method that takes a Position   The one that takes Position is inherited from the ArrayList class   Since your class Staff extends ArrayList lt Position gt   it automatically has the add Position  method   The new add String  Person  method is one that was written particularly for the Staff class

User · Answer

It is not recursion  it is overloading  The two add methods  the one in your snippet  and the one  provided  by ArrayList that you are extending  are not the same method  cause they are declared with different parameters

User · Answer

It is just an overload  The add method is from the ArrayList class  Look that Staff inherits from it

User · Answer

Recursion is a method that call itself  In this case it is a recursion  However it will be overloading until you put a restriction inside the method to stop the loop  if-condition

[java] Calling a method inside another method in same class

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