为了使客户端菜单在完成后返回登录菜单，请添加两个while循环，一个用于登录屏幕，一个用于客户端屏幕，如下所示：
boolean loginScreenDone=false;
while(!loginScreenDone) {
System.out.println("--------Login Screen--------");
System.out.println("Enter C for client and E for employee: ");
String login = s.nextLine();
if ("C".equals(login)) {
boolean clientScreenDone=false;
while(!clientScreenDone) {
System.out.println("Welcome to the client screen");
System.out
.println("There are 3 Lotteries (Lotto, Jackpot and National)");
System.out.println("Please select one (L, J, N) or E to exit: ");
String select = s.nextLine();
switch (select) {
case "L":
//call a method to handle Lotto here
break;
case "J":
//call a method to handle Jackpot here
break;
case "N":
//call a method to handle National here
break;
case "E":
clientScreenDone=true;
break;
default:
System.out.println("Invalid Selection");
break;
}
}
}
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