新来java； 如何在条件语句中生成字符串 static？

Question

public class testing {
   public static void main(String[] args)
   {
     boolean a = true;
     if (a) {
       public static String word = " ";
     }
     else if (a == false) {
       public static String word = "not";
     }
     System.out.println(word);
   }
   
 }

Instead of printing the value, it tells me "Illegal modifier for the variable word; only final is permitted. I tried to use public static final String word = "not"; but I still got an error saying that it is wrong.

Answer 1

The variable should be created outside of your main :

public class Testing {

   public static String word;

   public static void main(String[] args)
   {
     boolean a = true;
     if (a) {
       word = " ";
     } else {
       word = "not";
     }
     System.out.println(word);
   }
   
 }

Alternatively you can create a variable inside you main as well.

public class Testing {

   public static void main(String[] args)
   {
     boolean a = true;
     String word;
     if (a) {
       word = " ";
     } else {
       word = "not";
     }
     System.out.println(word);
   }
   
 }

Answer 2

When variables, blocks or methods are made static , they are made available during load time. Rest all reserves memory during run time. All the local variables created inside a static method are present in the method stack, which as a package is already present during load time. So creating a static variable inside method, be it be static or non-static method, is not allowed.