How to use a returned boolean value from a method?

Question

Not sure if I am wording this correctly however I'm trying to get an input from a user which then checks if the answer is 'yes', and if it is I want it to return 'true', then use this in my main method.

[Main Method]
String inputFromUser = JOptionPane.showInputDialog(null, "Yes/No?");

checkBoolean(inputFromUser);

if(inputFromUser = true) {
System.out.println("Yes, true!"); }

else if(inputFromUser = false) {
System.out.println("No, false!"); }

public static boolean checkBoolean(String inputFromUser) {

boolean returnValue;

if(inputFromUser.equals("yes")) {
returnValue = true; }

else {
returnValue = false; }
}
return returnValue;
}

With this code I get incompatible types in my main method where I am doing inputFromUser = true. Required string but receives boolean.

error: incompatible types. if(inputFromUser = true) { required: String found: boolean

How can I make this work exactly? There's probably an answer on this site already but I do not know how to word the question exactly.

Answer 1

Change

checkBoolean(inputFromUser);

if(inputFromUser = true) {
System.out.println("Yes, true!"); }

else if(inputFromUser = false) {
System.out.println("No, false!"); }

to

if(checkBoolean(inputFromUser))  //This is same as if(checkBoolean(inputFromUser)==true)
System.out.println("Yes, true!"); 
else
System.out.println("No, false!");

In your current code,you try to assign a String to a boolean which makes no sense. I think you meant == there as you want to compare them.But even if you change that,it is wrong as you compare a String with a boolean value. Another way would be t store the return value of the method in a boolean variable and use it in the if.The below code does that:

boolean check = checkBoolean(inputFromUser);

if(check)  //This is same as if(check==true)
System.out.println("Yes, true!"); 
else
System.out.println("No, false!");

Also,your checkBoolean method can be shortened into a single line using

return inputFromUser.equals("yes");