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Java: Display the system time

Java Basic: Exercise-46 with Solution

Write a Java program to display system time.

Pictorial Presentation:

Java: Display the system time

Sample Solution:

Java Code:

public class Exercise46 {
  
  public static void main(String[] args){
         System.out.format("\nCurrent Date time: %tc%n\n", System.currentTimeMillis());
    }
}

Sample Output: 

Current Date time: Fri Jun 16 14:17:40 IST 2017

Flowchart:

Flowchart: Java exercises: Display the system time

Java Code Editor:

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Java: Tips of the Day

Oddness Check

Is it possible to use this code to accurately determine the odd number?

public boolean oddOrNot(int num) {
  return num % 2 == 1;
}

I hope you noticed a trick. If we decide to check a negative odd number in such a way (-5, for example), the remainder of the division will not be equal to one (what does it mean?) Therefore, use a more accurate method:

public boolean oddOrNot(int num) {
  return (num & 1) != 0;
}

It not only solves the problem of negative numbers, but also works more productively than its predecessor. Arithmetic and logical operations are performed much faster than multiplication and division.

Ref: https://bit.ly/3giyonA

 

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