Why won't this code loop?

Hello everyone, I'm brand new to java and also to this forum. Hoping to get some help and maybe help others when I get better at this.

Ok, so I tried to make a loop, if you enter "y" the code is supposed to loop, otherwise the program should terminate, but for some reason it won't loop, and I can't figure out what I'm doing wrong...

Code :

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import java.util.Scanner;
 
public class scanner {
	public static void main (String args[]){
 
		Scanner scn = new Scanner(System.in);
		Scanner go = new Scanner(System.in);
 
		int fnum, snum, answer;
		String yn = "y";
 
		while(yn == "y"){	// this is there my loop starts
 
			System.out.print("enter first number: ");
			fnum = scn.nextInt();
			System.out.print("enter second number: ");
			snum = scn.nextInt();
			answer = fnum - snum;
			System.out.println(fnum + " - " + snum + " = " + answer);
 
			System.out.print("go again (y/n)? ");
			yn = go.nextLine();
			System.out.print(yn);	// just so make sure yn="y"
		}	
	}
}

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Use the equals method to compare Strings, not the == operator.

If i do that, i get a "Type mismatch: cannot convert from Strings to boolean"...

Please post the code that created the error message.

It is this one, here without the ==.

The error message reads:

Quote:

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Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Type mismatch: cannot convert from String to boolean

at scanner.main(scanner.java:12)

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Code :

---

import java.util.Scanner;
 
public class scanner {
	public static void main (String args[]){
 
		Scanner scn = new Scanner(System.in);
		Scanner go = new Scanner(System.in);
 
		int fnum, snum, answer;
		String yn = "y";
 
		while(yn = "y"){	// this is there my loop starts
 
			System.out.print("enter first number: ");
			fnum = scn.nextInt();
			System.out.print("enter second number: ");
			snum = scn.nextInt();
			answer = fnum - snum;
			System.out.println(fnum + " - " + snum + " = " + answer);
 
			System.out.print("go again (y/n)? ");
			yn = go.nextLine();
			System.out.print(yn);	// just so make sure yn="y"
		}	
	}
}

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Code :

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while(yn = "y"){	// this is there my loop starts

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The while statement requires a boolean value inside of the ().
Your code has an assignment statement inside of the ()s that evaluates to a String.

Quote:

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cannot convert from String to boolean

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The compiler is complaining that there is no way to convert the String to the required boolean

Where are you using the equals() method that I recommended?