public class Node<T> { 
 
 private T data; 
 private Node<T> next; 
 
 public Node(T data, Node<T> next) } 
  this.data = data; 
  this.next = next; 
 } 
 
 public T getData() { return data; } 
 // ... 
} 

public class Node { 
 
 private Object data; 
 private Node next; 
 
 public Node(Object data, Node next) { 
  this.data = data; 
  this.next = next; 
 } 
 
 public Object getData() { return data; } 
 // ... 
} 

public class Node<T extends Comparable<T>> { 
 
 private T data; 
 private Node<T> next; 
 
 public Node(T data, Node<T> next) { 
  this.data = data; 
  this.next = next; 
 } 
 
 public T getData() { return data; } 
 // ... 

public class Node { 
 
 private Comparable data; 
 private Node next; 
 
 public Node(Comparable data, Node next) { 
  this.data = data; 
  this.next = next; 
 } 
 
 public Comparable getData() { return data; } 
 // ... 
} 

public class Node<T> { 
 
 public T data; 
 
 public Node(T data) { this.data = data; } 
 
 public void setData(T data) { 
  System.out.println("Node.setData"); 
  this.data = data; 
 } 
} 
 
public class MyNode extends Node<Integer> { 
 public MyNode(Integer data) { super(data); } 
 
 public void setData(Integer data) { 
  System.out.println("MyNode.setData"); 
  super.setData(data); 
 } 
} 

MyNode mn = new MyNode(5); 
Node n = mn;   // 原生类型 – 编译器会给出未检查警告 
n.setData("Hello");  
Integer x = mn.data; // 会引发抛出ClassCastException 

MyNode mn = new MyNode(5); 
Node n = (MyNode)mn;   //原生类型 – 编译器会给出未检查警告 
n.setData("Hello"); 
Integer x = (String)mn.data; //会引发抛出ClassCastException 

public class Node { 
 
 public Object data; 
 
 public Node(Object data) { this.data = data; } 
 
 public void setData(Object data) { 
  System.out.println("Node.setData"); 
  this.data = data; 
 } 
} 
 
public class MyNode extends Node { 
 
 public MyNode(Integer data) { super(data); } 
 
 public void setData(Integer data) { 
  System.out.println("MyNode.setData"); 
  super.setData(data); 
 } 
} 

class MyNode extends Node { 
 
 // 编译器生成的桥方法 
 // 
 public void setData(Object data) { 
  setData((Integer) data); 
 } 
 
 public void setData(Integer data) { 
  System.out.println("MyNode.setData"); 
  super.setData(data); 
 } 
 
 // ...