Java Object dependency

i can't understand difference between these two pattern. i feel these two are same but different program patterns. just entered into spring.

pattern 1 - dependency injection by constructor and setter method

class Employee{

   Address address ;

   public Employee(Address address ) {
    this.address = address;
   }
   public void setAddress(Address address ) {
    this.address = address;
   }

}

Pattern 2 - old java object creation

class Employee{
    Address address ;
    public Employee(){
      address = new Address();
    }
}

i can't understand why pattern 1 is good(loosly coupled) and pattern 2 is tightly coupled. anyhow Employee should be depending on Address class .