无涯教程-Java泛型 - 多个类型泛型类可以具有多个类型参数。以下示例将展示上述概念。 package com.le

泛型类可以具有多个类型参数。以下示例将展示上述概念。

package com.learnfk;
public class GenericsTester {
public static void main(String[] args) {
Box<Integer, String> box = new Box<Integer, String>();
box.add(Integer.valueOf(10),"Hello World");
System.out.printf("Integer Value :%d\n", box.getFirst());
System.out.printf("String Value :%s\n", box.getSecond());
  </span><span class="typ">Box</span><span class="pun">&lt;</span><span class="typ">String</span><span class="pun">,</span><span class="pln"> </span><span class="typ">String</span><span class="pun">&gt;</span><span class="pln"> box1 </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">Box</span><span class="pun">&lt;</span><span class="typ">String</span><span class="pun">,</span><span class="pln"> </span><span class="typ">String</span><span class="pun">&gt;();</span><span class="pln">
  box1</span><span class="pun">.</span><span class="kwd">add</span><span class="pun">(</span><span class="str">"Message"</span><span class="pun">,</span><span class="str">"Hello World"</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">printf</span><span class="pun">(</span><span class="str">"String Value :%s\n"</span><span class="pun">,</span><span class="pln"> box1</span><span class="pun">.</span><span class="pln">getFirst</span><span class="pun">());</span><span class="pln">
  </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">printf</span><span class="pun">(</span><span class="str">"String Value :%s\n"</span><span class="pun">,</span><span class="pln"> box1</span><span class="pun">.</span><span class="pln">getSecond</span><span class="pun">());</span><span class="pln">

}
}
class Box<T, S> {
private T t;
private S s;
public void add(T t, S s) {
this.t = t;
this.s = s;
}
public T getFirst() {
return t;
}
public S getSecond() {
return s;
}
}

这将产生以下输出。

Integer Value :10
String Value :Hello World
String Value :Message
String Value :Hello World

无涯教程-Java泛型 - 多个类型

参考链接