我基本上是想調(diào)試下面的Type Promotion代碼來理解為x創(chuàng)建的臨時(shí)double變量。我怎樣才能做到這一點(diǎn)？public class TypePromotion {public static void main(String args[]){    int x = 10;    double y = 20.0;    double z = x + y;    System.out.println("value of Z is :: "+z); // outputs 30.0    System.out.println("value of X is :: "+x); // outputs 10}}