泛型对象的使用
package com.example.core.mydemo.java; import java.util.Objects; /** * output: * null * null * java.lang.Object@3b07d329 * 0 * java.lang.Object@41629346 * 0 * @param <T> */ public class ObjectTest<T> { public <T> String convertObjToStr(T value) { return Objects.isNull(value) ? null : value.toString(); } public String convertObjToStr2(T value) { return Objects.isNull(value) ? null : value.toString(); } public static void main(String[] args) { System.out.println(new ObjectTest().convertObjToStr(null)); System.out.println(new ObjectTest().convertObjToStr2(null)); System.out.println(new ObjectTest().convertObjToStr(new Object())); System.out.println(new ObjectTest().convertObjToStr2(new Integer(0))); System.out.println(new ObjectTest<Object>().convertObjToStr(new Object())); System.out.println(new ObjectTest<Integer>().convertObjToStr2(new Integer(0))); } }
标签:对象,ObjectTest,System,value,使用,泛型,new,null,out From: https://www.cnblogs.com/oktokeep/p/18148874