[JAVA rookie] about the value that has been assigned, but the system says it may not be able to get it.

the code is as follows:

package com.helloworld;


public class HelloWorld {
    
    public static void main(String[] args) {
        
        int index;                //index
        
        for (int i = 0 ; i < 10 ; iPP) {
            
            if (i == 5 ) {
                index = i;     //i5index
            }
        
        }
        System.out.println("index" + index);    
            //
            //forindex
            //
    }
    
}
The

error will disappear only if the initial variable declaration is changed from int index to index index = 0.
but I don"t understand this. I clearly assigned a value in it, why is it wrong?

Jul.12,2022

java local variables must be initialized before they can be used.


because the compiler determines when checking that the local variable index may not be initialized, the expression I < 10 is not a constant expression, and the compiler cannot determine that the index must be initialized according to the defined rule, so the compiler will prompt "Variable index might not have been initialized". For more information, please refer to Chapter 16 "Definite Assignment" of the Java language Specification.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-7bb6bc-1343b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7bb6bc-1343b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?