Java If-Else语句执行不正确

这是我的代码，顺便说一句，我不是要求免费修复，我是在找人帮助我，解释我的错误。提前谢谢

    * Psuedocode: 
 * 1. Ask the user if they want to enter a number or if they want the computer to select a random number. 
 * 2. Based on the user selection, Ask the user for a number or generate a random number. 
 * 3. Read the number from the user (Skip the step if a random number is generated)
 * 4. Check if the number is 1 digit or 2 digit or 3 digit or 4 digit
 * 5. if it is 1 digit then check if the cube of number equals the number
 * 6. else if it is 2 digit, get the cube of first and second digits and then sum them up and check if the number is equal to the sum.
 * 7. else if it is 3 digit, get the cube of first, second and third digits and then sum them up andcheck if the number is equal to the sum.
 * 8. if it is 4 digit, get the cube of first, second, third and fourth digits and then sum them up andcheck if the number is equal to the sum.
 * 9. else tell the user that the number they have entered is not within 9999
 * 10. Print a closing message saying if the number is an Armstrong number or not. 
 * 11. Print a goodbye statement.

*/

我选择的随机生成器方法不起作用。它仅将1和2显示为armstrong数字或非armstrong数字，但不为该代码中的选项2生成随机数

   int choice = 0;
   Random rand = new Random();
   // you need to assign something to choice before the next line
   // maybe choice = rand.nextInt (); ?
   if(choice == 1)

---

int choice=0后跟ifchoice==1。。。那永远不会是真的。。。后跟else ifchoice==2。。。不，也不是真的。当我取消初始化choice时，if else语句中有一个编译器错误，它被取消初始化。基本上，在测试它的值之前，不会从输入中分配choice。

   int choice = 0;
   Random rand = new Random();
   // you need to assign something to choice before the next line
   // maybe choice = rand.nextInt (); ?
   if(choice == 1)