循环try-catch不起作用

Question

How would I properly loop this try catch statement? From what I'm aware, the playerIntInput = reader.nextInt(); within the try block is executed and it catches the exception if one exists, this should cause the loop = false to never be reached. Then it output the message in the catch block and it should loop back to the try and ask for input again. Instead I just get an infinitely looped output from the catch block.

void CheckInput(int playerIntInput) {
    boolean loop = true;

    while(loop=true) {
        try {
            playerIntInput = reader.nextInt();
            loop = false;
        }
        catch(InputMismatchException e) {
            System.out.println("Invalid character was used, try again.");
        }
    }
}

Answer 1

You used the assignment operator = , so loop is always true when checked, instead of the == operator. You could use while(loop == true) , but loop is already a boolean . The simplest solution is while(loop) .

Also, if there's an error in nextInt , it won't consume the input. Call next() in the catch block to consume the non-numeric input and advance past it.