Implementing Boolean into if else statements

boolean isTired = true; // setting boolean to true.
if(isTired) { // isTired is the same thing as if(isTired == True)
   System.out.println("Go to sleep");
} else { 
    System.out.println("KeepWorking");
}

Go to sleep

if-elseif-elseif-elsif-else statement, 5 or more conditions

int day= 4;

if(day==1){
    System.out.println("Sunday");
}
else if(day==2){
    System.out.println("Monday");

}
else if(day==3){
    System.out.println("Tuesday");
}
else if(day==4){
    System.out.println("Wednesday");
}
else if(day==5){
    System.out.println("Thursday");
}
else if(day==6){
    System.out.println("Friday");
}
else if(day==7){
    System.out.println("Saturday");
}

Wednesday

Now let's switch up! Time to make things easier and use switch case

A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each switch case.

int day=3;

switch(day){
    
    case 1:
        System.out.println("Sunday");
         break;
    case 2:
        System.out.println("Monday");
        break;
     case 3:
        System.out.println("Tuesday");
        break;
    case 4:
        System.out.println("Wednesday");
         break;
    case 5:
        System.out.println("Thursday");
         break;
    case 6:
         System.out.println("Friday");
          break;
     case 7:
          System.out.println("Saturday");
           break;
          
}

Tuesday

DeMorgan’s laws were developed by Augustus De Morgan in the 1800s. They show how to handle the negation of a complex conditional, which is a conditional statement with more than one condition joined by an and (&&) or or (||), such as (x < 3) && (y > 2)

int x = 4, y = 3;
if (!(x < 3 || y > 2))
{
   System.out.println("True");
}
else
{
   System.out.println("False");
}

int x = 4, y = 3;
if (!(x < 3 && y > 2))
{
   System.out.println("True);
}
else
{
   System.out.println("False");
}