how does switch work in java code example

Example 1: java switch

int day = 4;
switch (day) {
  case 6:
    System.out.println("Today is Saturday");
    break;
  case 7:
    System.out.println("Today is Sunday");
    break;
  default:
    System.out.println("Looking forward to the Weekend");
}
// Outputs "Looking forward to the Weekend"

Example 2: java switch case

switch(x){
	case(0):		//if x == 0
    	//do some stuff
    	break;
    //add more cases
  default:			//when x does not match any case
    //do some stuff
    break;
}

Example 3: switch en java

switch (/*Variable*/)
{
  case /*Variable*/:
    /*Action*/;
    break;        
  default:
    /*Action*/;             
}