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Onlineeducation/src/main/java/com/controller/hello.java

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// 声明该类所属的包这里包名为com.controller
package com.controller;
// 定义一个公共类hello
public class hello {
// 主方法,程序执行的入口点
public static void main(String[] args) {
// 声明一个整数类型的变量a未初始化
int a;
}
}