What is my age?

Main.java

// You have the class Tree:

class Tree {
    String sort;
    int age;
    double height;
}

/**
  After you execute the following code,
  what will be the value of tree1.age ?
 **/

Tree tree1 =  new Tree();
Tree tree2 = tree1;
Tree tree3 = tree2;


tree1 = new Tree();
tree1.age = 5;
tree2.age = 10;
tree3 = null;