Use Inbuilt or Core Function of Date & Math Class

import java.util.*;
class date {
    public static void main(String[] args) {
       
   
    Date date1=new Date();
    System.out.println("Full date is :"+date1);
    System.out.println("Date is : "+date1.getDate());
    System.out.println("Day is : "+date1.getDay());
    System.out.println("Hour is : "+date1.getHours());
    System.out.println("Mintiues is : " +date1.getMinutes());
    System.out.println("Second is : "+date1.getSeconds());
    System.out.println("Time is : "+date1.getTime());
    System.out.println("Year is : "+date1.getYear());
    System.out.println("Time Zone OffSet is : "+date1.getTimezoneOffset());
    }   

}

OutPut is=

Full date is :Wed Dec 02 17:52:01 IST 2015
Date is : 2
Day is : 3
Hour is : 17
Mintiues is : 52
Second is : 1
Time is : 1449058921359
Year is : 115
Time Zone OffSet is : -330








import java.lang.Math;
import java.util.*;

class Maths {
    public static void main(String[] args) {
        int a=Math.abs(-1);
        System.out.println("Abs Of Given Number is : "+a);
        double b=Math.ceil(1.2522);
        System.out.println("Ceil of  Given Number is : "+b);
        double c=Math.sqrt(25);
        System.out.println("Square root of Given Number is : "+c);
        double d=Math.E;
        System.out.println("Value Of e is : "+d);
        double f=Math.PI;
        System.out.println("Value Of PI is :"+f);
    }
   

}

Output is :
Abs Of Given Number is : 1
Ceil of  Given Number is : 2.0
Square root of Given Number is : 5.0
Value Of e is : 2.718281828459045
Value Of PI is :3.141592653589793