java安装

  • 我在安装java时出现了安装失败，问题是，安装路径出现了中文。
  • 配置环境变量时，先配置JAVA_HOME，然后在PATH配置\bin和\jre。

遇到的问题

  1. 在安装一次java后，移动java文件夹到其他位置，更改环境变量后，在cmd窗口不能正常输出java版本

  2. public class HelloWorld {
	public static void main(String[] args) {
		System.out.println("Hello, World!!!");
	}
}

    编译成class文件后，运行报错，提示

    错误: 找不到或无法加载主类 HelloWorld.class

解决办法

  1. 删除C:\Program Files (x86)\Common Files\Oracle\Java\javapath下的
  • java.exe
  • javaw.exe
  • javaws.exe

在解决过程中我把java的环境变量放移动到了path的最上方，此时编辑path环境变量时，不再像以前那样像表格一样列出来，而是就一行值的方框。原因是把C:\Program Files (x86)\Common Files\Oracle\Java\javapath环境变量没有放在第一位。

  1. 在运行时命令带有.class后缀，也就是说运行class文件时，java后跟的是类名而不是文件名

idea破解

  1. idea安装完成后不要启动，把破解包【jetbrains-agent.jar】放在idea安装目录的【bin目录】下
  2. 修改【bin目录】下配置文件的【idea64.exe.vmoptions】，在最后一行加入如下一行，idea目录修改成自己idea的安装目录
    -javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.4\bin\jetbrains-agent.jar
  3. 启动idea，输入激活码即可

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