Converting Switch statements into if else statements

how can I convert these switch statements into if else statements then into if-then statements?

String dayString1, dayString2, dayString3;

    int day = KB.nextInt(); 

    switch (day) {          case 1: 
        dayString1 = "Saturday";        case 2: 
        dayString2 = "Sunday"; 
        break;          case 3: 
        dayString3 = "Monday"; 
        break;          case 4: 
        dayString1 = "Tuesday";         case 5: 
        dayString2 = "Wednesday"; 
        break;          default: 
        dayString3 = "Invalid day"; 
        break; 
    }