inheritance - new keyword in java -

new java, , still struggling new keyword , inheritance:

public class a1 {     void a_method (){         system.out.println("inside a1 method");     } } 

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public class a2 extends a1{     void a_method(){         system.out.println("inside a2 method");     } } 

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public class testa1a2 {      public static void main(string[] args) {          a1 a1 = new a1();         a1 a2 = new a2();  //not sure if created object of a1 or a2         a2 a3 = new a2();          a1.a_method();         a2.a_method();         a3.a_method();      } } 

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i struggling understand new keyword , if in above code:

a1 a2 = new a2();  //not sure if created object of a1 or a2 

will a2 object of a1 or a2? output can see called method of a2, dont new keyword. , a2 extending a1, possile call method of a1??

a1 a2 = new a2();  

this code creates a2 object can access methods of a1 class a2. if method overriden in a2, method of a2 called.