why the value of fileCheck is not changing according to bit

I want the value of fileCheck to change when the value of bit is changed

class HelloWorld {
    
    static String bit = "1";
    
    static void changeBit(String profile) {
        if(profile.contains("0")) {
            bit = "0";
        }
    }
    
    static String fileCheck = "check"+ bit +"file";
    
    private static void checkFile() {
        System.out.println("val "+fileCheck);
    }
    public static void init(){
        changeBit("file0");
        System.out.println("Value of File from init "+ fileCheck);
    }

    public static void main(String[] args) {
        HelloWorld obj = new HelloWorld();
        obj.init();
        obj.checkFile();
    }
}

Output:

Value of File from init check1file
val check1file

>Solution :

The two commentators are right:
Since the value for fileCheck is only calculated once you always see the initial value. You have to update the value whenever the value of bit changes. Here is a possible version:

static void changeBit(String profile) {
    if(profile.contains("0")) {
        bit = "0";
        fileCheck = "check"+ bit +"file";
    }
}