关于java的包Package中同名类的冲突及其理解

package chapter2;
public class Telphone {
  //属性
	 private float cup;
	 private float screen;
	 private float mem;
  //get set方法
	 public float getScreen() 
	 {
		 return screen;
	 }
	 public void setScreen(float newScreen) 
	 {
		 screen=newScreen;
	 }
	 //方法	
	 public Telphone() 
	 {
		 System.out.println("第一个包的Telphone类");
	 }
}

package pack2;
public class Telphone {
     public Telphone() {
		// TODO Auto-generated constructor stub
    	 System.out.println("第二个包的类Telphone");
	}
}

package pack3;
public class Telphone {
   public Telphone() {
	// TODO Auto-generated constructor stub
	   System.out.println("第三个包的Telphone类");
}
}

package chapter2;
public class InitalTelphone {
	public static void main(String[] args) {
		//通过无参方法生成对象
	 Telphone tel=new Telphone();	
	}
}

package chapter2;
import pack2.Telphone;
public class InitalTelphone {
	public static void main(String[] args) {
		//通过无参方法生成对象
	 Telphone tel=new Telphone();
	}
}

package chapter2;
import pack2.*;
public class InitalTelphone {
	public static void main(String[] args) {
		//通过无参方法生成对象
	 Telphone tel=new Telphone();
	}
}

package chapter2;
import pack2.Telphone;
import pack3.Telphone;;
public class InitalTelphone {
	public static void main(String[] args) {
		//通过无参方法生成对象
	 Telphone tel=new Telphone();
	}
}

package chapter2;
import pack2.*;
import pack3.Telphone;;
public class InitalTelphone {
	public static void main(String[] args) {
		//通过无参方法生成对象
	 Telphone tel=new Telphone();
	 //有参构造方法生成对象
	 //Telphone tel2=new Telphone(4.0f,3.0f,1.5f);
	}
}