vs code 配置java环境

vs code 配置java环境，并且利用powershell的特性完成了程序运行时间的计算，秒为单位，保留小数点后7为
ctrl+sheft +p

image.png

输入tasks：选择configure task runner，将一下代码贴到tasks.json
这样就可以来运行java程序了，ctrl+F9
注意：
由于如果你想是javap 汇编出java程序，你可以
将如下

"$start=Get-Date;javac ${file} ; java  ${fileBasenameNoExtension} ; $end=Get-Date; ('[Finished in ' + ($end - $start).TotalSeconds+ ' s]')"

换为：

"$start=Get-Date;javac ${file} ; javap -v ${fileBasenameNoExtension} ; $end=Get-Date; ('[Finished in ' + ($end - $start).TotalSeconds+ ' s]')"

{
    "version": "0.1.0",
    "command": "powershell",
    "isShellCommand": true,
    "showOutput": "always",
    "args": [
        "/C"
    ],
    "tasks": [
        {
            "taskName": "javap",
            "isShellCommand": true,
            "isBuildCommand": true,
            "suppressTaskName": true,
            "args": [
                "$start=Get-Date;javac ${file} ; java ${fileBasenameNoExtension} ; $end=Get-Date; ('[Finished in ' + ($end - $start).TotalSeconds+ ' s]')"
            ],
            "showOutput": "always"
        },
        {
            "taskName": "java",
            "command": "java",
            "isShellCommand": true,
            "isBuildCommand": true,
            "args": [
                "${fileBasenameNoExtension}"
            ],
            "showOutput": "always"
        },
        {
            "taskName": "javac",
            "command": "javac",
            "isShellCommand": true,
            "isBuildCommand": true,
            "args": [
                "${file}"
            ],
            "showOutput": "always"
        }
    ]
}