📅  最后修改于: 2022-03-11 14:52:29.008000             🧑  作者: Mango
//set choiceentry to -1, this will make it to enter while loop
int choiceentry = -1
while(choiceentry < 1 || choiceentry > 3){
System.out.println("Enter \"1\", \"2\", \"3\" or \"4\"");
if(scanchoice.hasNextInt())
choiceentry = scanchoice.nextInt();
}
switch(choiceentry){
case 1:
//do logic
break;
case 2:
//do logic
break;
case 3:
//do logic
break;
}