If else

Boolean isItSunny = true;
Boolean isItRaining = false;
Boolean areYouWorking = false;

if(isItSunny == false){
    System.debug('Do not go to party');
} else if (isItRaining == true){
    System.debug('Do not go to party');
} else if ( areYouWorking == true){
    System.debug('Do not go to party');
} else{
    //multi line code block
    System.debug('Yayy!! its party time');
    System.debug('2nd line');
    System.debug('3rd line');
}