Java 泛型核心概念：类、方法与上下限

Java 泛型核心概念

1. 学习泛型类、泛型方法、泛型参数

2. 泛型的上限、下限

package IMF;

public class JavaGenerics {
    public static void main(String[] args) {
        // Empty empty = null; //empty = new Empty("spark");
        // System.out.println("Content:    "+ empty.getItem());

        // Empty<String,Integer> empty = null; //empty = new Empty<String,Integer>("Spark",6); //empty = new Empty ("Spark",99.9999);
        // System.out.println(empty.getKey() + "->" + empty.getValue());

        // log(empty); /*News news=null; news=new ITNews("Life is sh
    }
}