泛型学习1-将类型参数化

例子代码如下：

package com.perficient.javabasic.test;

import java.util.HashMap;
public class Generic<K, V> {
	public HashMap<K, V> map = new HashMap<K, V>();

	public void put(K k, V v) {
		map.put(k, v);
	}

	public V get(K k) {
		return map.get(k);
	}
	public static void main(String[] args) {

		Generic<String, String> test1 = new Generic<String, String>();
		test1.put("key1", "The first Value");
		System.out.println("The value of key1 is:" + test1.get("key1"));

		Generic<Integer, String> test2 = new Generic<Integer, String>();
		test2.put(1, "The Integer one");
		System.out.println("The value of 1 is:" + test2.get(1));	
	}
}

运行结果:

The value of key1 is:The first Value
The value of 1 is:The Integer one

总结

泛型可以将参数类型参数化