泛型+instanceof实现不同类型参数添加

package org.example.testGeneraic;

public class Main {
    public static  void addNum(T param) {
        if (param instanceof Integer) {
            System.out.println("int:" + param);
        } else if (param instanceof Long) {
            System.out.println("long:" + param);
        } else if (param instanceof String) {
            System.out.println("String:" + param);
        } else {
            System.err.println("ERROR");
        }
    }

    public static void main(String[] args) {
        addNum(1);
        addNum(2L);
        addNum("abc");
    }
}