double轉int類型
方法一
double double1 = 111.111;
int int1= new Double(double1).intValue();
System.out.println(int1);
方法二
double double2= 222.222;
int int2 = (int)Math.round(double2);
int int22 = (int)Math.ceil(double2);
int int222 = (int)Math.floor(double2);
System.out.println("四捨五入取整" + int2);
System.out.println(“向上取整” + int22);
System.out.println(“向下取整” + int222);
方法三
但是上面兩種在特殊情況下, 會損失精度
eg: double d1 = 3.39
double d1 = 8.29
double d1 = 18.31
如何讓解決損失精度的問題
double double3 = 33.33;
String format = new DecimalFormat("#").format(double3);
System.out.println(format);