Java 程序使用未经检查或不安全的操作
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原文地址: http://stackoverflow.com/questions/36113596/
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Java program uses unchecked or unsafe operations
提问by Eri Agbayani
I was writing a program in our activity in school and when I compile I get the following error:
我在学校的活动中编写程序，编译时出现以下错误：
I am also using notepad++ to compile This is the code:
我也是用notepad++编译的，代码如下：
import java.util.ArrayList;
import java.util.Collections;
public class Main {
public static void main(String[] args) {
ArrayList arrayList = new ArrayList();
arrayList.add("A");
arrayList.add("B");
arrayList.add("C");
arrayList.add("D");
arrayList.add("E");
System.out.println("Before Reverse Order: " + arrayList);
Collections.reverse(arrayList);
System.out.println("After Reverse Order: " + arrayList);
}
}
I am new to learning java so any help is appreciated thank you!
我是学习 Java 的新手，因此感谢您的帮助！
采纳答案by Yassin Hajaj
You are using raw typeswith the ArrayList
您正在使用的原始类型与ArrayList
replace it with
将其替换为
ArrayList<String> arrayList = new ArrayList<>();
More info: What is a raw type and why shouldn't we use it?
更多信息：什么是原始类型，我们为什么不应该使用它？
