initializing final Boolean in if-Statement-CodePudding

So I am trying to set leapyear to true in the if statement, but when I do so it tells me thatleapYear in the second if-Statement is not Initilized. Thanks for your help!

public class LeapYear {
    public static void main(String[] args) {
        int year = 1600   (int)(Math.random() * 500);
        final boolean leapYear;
        
        if(year%4==0){
           leapYear = true;
        }

        if (leapYear){
            System.out.println(year   " leap");
        } else {
            System.out.println(year   " notleap");
        }
    }
}

CodePudding user response：

If we declare a final variable outside an if-else-statement and initialize it in the if-branch, we have to initialize it in the corresponding else-branch as well. If no else-branch exists, we must create one, otherwise the variable is uninitialized iff. the if-branch is not entered.

class Ideone {
  public static void main(String[] args) {
    int year = 1600   (int)(Math.random() * 500);
    final boolean leapYear;

    if(year%4==0){
      leapYear = true;
    } else {
      leapYear = false;
    }

    if (leapYear){
      System.out.println(year   " leap");
    } else {
      System.out.println(year   " notleap");
    }
  }
}

Ideone demo

CodePudding user response：

leap Year variable may not always be initialized

    public class LeapYear {
        public static void main(String[] args) {
            int year = 1600   (int)(Math.random() * 500);
            boolean leapYear = false;
            
            if(year%4==0){
               leapYear = true;
            }
   
            if (leapYear){
                System.out.println(year   " leap");
            } else {
                System.out.println(year   " notleap");
            }
         }
   }

CodePudding user response：

public class LeapYear {
public static void main(String[] args) {
    int year = 1600   (int)(Math.random() * 500);
    boolean leapYear = year % 4 == 0;
    
    if (leapYear){
        System.out.println(year   " leap");
    } else {
        System.out.println(year   " notleap");
    }
}

}

CodePudding user response：

You have to remove final before the name of the variable and initialize the variable to false

for Example

public static void main(String[] args) {
    int year = 1600   (int)(Math.random() * 500);
    boolean leapYear = false;
    
        if(year%4==0){
           leapYear = true;
       
         }

    if (leapYear){
        System.out.println(year   " leap");
    } else {
        System.out.println(year   " notleap");
    }

}