Java中基本數據類型的默認值(初始值)

數據類型	默認值
byte	0
short	0
int	0
long	0
float	0.0
double	0.0
char	'u0000'
boolean	false

public class demo1 {
    public static void main(String[] args) {

        Variable v = new Variable();
        System.out.println("byte類型的初始值為" + v.byteNum);
        System.out.println("short類型的初始值為" + v.shortNum);
        System.out.println("int類型的初始值為" + v.intNum);
        System.out.println("long類型的初始值為" + v.longNum);
        System.out.println("float類型的初始值為" + v.floatNum);
        System.out.println("double類型的初始值為" + v.doubleNum);
        System.out.println("boolean類型的初始值為" + v.flag);
    }
}
class Variable {
    byte byteNum;
    short shortNum;
    int intNum;
    long longNum;
    float floatNum;
    double doubleNum;
    boolean flag;
}

byte類型的初始值為0
short類型的初始值為0
int類型的初始值為0
long類型的初始值為0
float類型的初始值為0.0
double類型的初始值為0.0
boolean類型的初始值為false