Java note

顯示所有作業系統的環境變數


for (Map.Entry entry: System.getenv().entrySet()) {

    System.out.println(entry.getKey() + ":" + entry.getValue());
}

由誰呼叫某method

System.out.println(Thread.currentThread().getStackTrace()[1].getMethodName());

System.out.println(Thread.currentThread().getStackTrace()[2].getMethodName());
System.out.println(Thread.currentThread().getStackTrace()[3].getMethodName());