我正在用Java编程,我不明白如何使用break;命令退出多个循环。
以下是我尝试的一些代码:
while (true){
System.out.println("\n\nBank Menu: \nWhat action do you want to perform(Enter a number)?\n\n1. Create a bank account \n2. Log in to a preexisting account \n3. Exit bank system");
String action1 = scanner.next();
if (action1.equals("1")) {
if(!(password==null)){
if(createAccountTracker==1){
createAccountTracker=0;
break;
}
System.out.println("Are you sure? Creating a new account will remove your preexisting account\n1.Yes\n2.Cancel");
createaccount = scanner.next();
if(createaccount.equals(2)) {
createAccountTracker=1;
break;
}
}
System.out.println("What will your account name be(One Word Only)?");
accName = scanner.next();
System.out.println("Please enter your account password: ");
passwordCheck1 = scanner.next();
System.out.println("Please reenter your account password: ");
passwordCheck2 = scanner.next();
if(passwordCheck1.equals(passwordCheck2)){
password= passwordCheck2;
System.out.println("Your account has been made!\n\nThank you for creating an account!\nAccount name: " + accName + "\nPassword: " + password );
accBalance=0;
}
else{
System.out.println("Error: Two passwords entered do not match. Please try again.");
}
}
我试图这样做,如果他们输入2(取消),代码将突破两个循环并返回到银行菜单。我在SO上看到的问题并没有真正帮助我理解。提前谢谢!
答案 0 :(得分:4)
你可以通过这种方式突破2个循环:
outer:
while(condition) { // while or for loops, same way
while(condition2) {
break outer; // break out of the 2 loops
}
}
// Other code
" 外部" label标记了局外人循环。