String (初学者)如何使用带字符串的switch语句?
我正在尝试制作一个简单的银行账户程序来学习课程和OOP。正如你可能猜到的,我对Java是新手 无论如何,我的switch语句不起作用。我试图根据输入的字符串制作每个案例String (初学者)如何使用带字符串的switch语句?,string,switch-statement,case,bank,String,Switch Statement,Case,Bank,我正在尝试制作一个简单的银行账户程序来学习课程和OOP。正如你可能猜到的,我对Java是新手 无论如何,我的switch语句不起作用。我试图根据输入的字符串制作每个案例 Scanner input = new Scanner(System.in); System.out.println("Enter your name"); //the user enters "user1", "user2", or "user3". String user = input.next(); //swtich t
Scanner input = new Scanner(System.in);
System.out.println("Enter your name");
//the user enters "user1", "user2", or "user3".
String user = input.next();
//swtich time
switch (user) {
case "user1":
System.out.println("Your balance is" + user1.balance);
System.out.println("Your Account numer is" + user1.acctnum);
//shows the balance and account number for user1
case "user2":
System.out.println("Your balance is" + user2.balance);
System.out.println("Your Account numer is" + user2.acctnum);
case "user3":
System.out.println("Your balance is" + user3.balance);
System.out.println("Your Account numer is" + user3.acctnum);
}
你在每一个案例的结尾都遗漏了一个中断声明
case "user1":
System.out.println("Your balance is" + user1.balance);
System.out.println("Your Account numer is" + user1.acctnum);
//shows the balance and account number for user1
break;
如果没有break语句,所有这些语句都将被执行
每个案例的结尾都缺少一个break语句
case "user1":
System.out.println("Your balance is" + user1.balance);
System.out.println("Your Account numer is" + user1.acctnum);
//shows the balance and account number for user1
break;
如果没有break语句,所有这些语句都将被执行
如果您使用的是
Java7
或更高版本,您可以在switch
语句中使用Strings
,否则您不能如果您使用的是Java7
或更高版本,您可以在switch
语句中使用Strings
,否则您不能丢失中断代码>语句,因此将执行选定的案例
之后的所有语句
下面是一个开关箱的示例
[1]
public class SwitchDemo {
public static void main(String[] args) {
int month = 8;
String monthString;
switch (month) {
case 1: monthString = "January";
break;
case 2: monthString = "February";
break;
case 3: monthString = "March";
break;
case 4: monthString = "April";
break;
case 5: monthString = "May";
break;
case 6: monthString = "June";
break;
case 7: monthString = "July";
break;
case 8: monthString = "August";
break;
case 9: monthString = "September";
break;
case 10: monthString = "October";
break;
case 11: monthString = "November";
break;
case 12: monthString = "December";
break;
default: monthString = "Invalid month";
break;
}
System.out.println(monthString);
}
}
[1]您缺少中断代码>语句,因此将执行选定的案例
之后的所有语句
下面是一个开关箱的示例
[1]
public class SwitchDemo {
public static void main(String[] args) {
int month = 8;
String monthString;
switch (month) {
case 1: monthString = "January";
break;
case 2: monthString = "February";
break;
case 3: monthString = "March";
break;
case 4: monthString = "April";
break;
case 5: monthString = "May";
break;
case 6: monthString = "June";
break;
case 7: monthString = "July";
break;
case 8: monthString = "August";
break;
case 9: monthString = "September";
break;
case 10: monthString = "October";
break;
case 11: monthString = "November";
break;
case 12: monthString = "December";
break;
default: monthString = "Invalid month";
break;
}
System.out.println(monthString);
}
}
[1]您可以枚举字符串,然后使用开关
附言:请搜索一下,然后在这里发布问题;)你的问题与此类似(例如,有很多答案)
您可以枚举字符串,然后使用开关
附言:请搜索一下,然后在这里发布问题;)你的问题与此类似(例如,有很多答案)
我搜索并看到了这一点,但不知何故,我没有注意到break语句!很抱歉我搜索并看到了,但不知何故我没有注意到break语句!很抱歉