how to use ? in java instead of if else code example

Example 1: if statement in java

int x = 3;

if (x<=3){
	System.out.println("Hello World");
}

else {
	System.out.println("Bye World");
}

Example 2: if else in java

import java.io.*;
public class JavaIfElse
{
   public static void main(String[] args)
   {
      int number = 15;
      // check if number is divisible by 2
      if(number%2 == 0)
      {
         System.out.println(number + " is even number");
      }
      else
      {
         System.out.println(number + " is odd number");
      }
   }
}