Sum, Sub, Mul, Div of 2 numbers in JAVA

Sum, Sub, Mul, Div of 2 numbers in JAVA :-

class all
{
    public static void main()
    {
        int a=10,b=15,c;
        c=a+b;
        System.out.println("Sum is ="+c);
        c=a-b;
        System.out.println("Sub is ="+c);
        c=a*b;
        System.out.println("mul is="+c);
        c=a/b;
        System.out.println("div is="+c);
    }
}