double형으로 형변환 하는 방법

todouble.java

public class toDouble {
  public static void main(String[] args){
    int a = 66;
    double b = 3.456;
    String c = "90";
    char d = 'd';
    
    System.out.println("Integer to double : " + (double)a);
    // Integer to double : 66.0
   
    System.out.println("DataType Check : "+(double)a==a);
    // DataType Check : true
  }
}