如何比较java中的单个字符

Question

I want to input character from user.If user inputs character 'Y' then continue else exit from application. For looping I am using do-while. Condition for application is used in while block. But it's not working.Whatever user inputs application doesn't exit and continue.

char choice='\u0000';
do
{
    System.out.println("Enter Y to continue or N to exit");
    choice=(char)System.in.read();
}
while(choice!='N');

Answer 1

choice = (char) System.in.read(); 

(casting a byte from system encoding to UTF-16) will only work if the characters have identical values in both encodings; this will usually only work for a very small range of characters. Using Scanner is more reliable.

I updated your query, with Scanner class for reading character.

Scanner reader = new Scanner(System.in);
char choice='\u0000';
do
{
    System.out.println("Enter Y to continue or N to exit");
    choice = reader.next().charAt(0);
}
while(choice!='N' && choice != 'n');

Answer 2

I think it would be easyer if you do it like this:

char choice='\u0000';
System.out.println("Enter Y to continue or N to exit");
Scanner reader = new Scanner(System.in);
while(choice!='N' && choice!='Y' && choice!='n' && choice!='y') {
    choice = reader.nextLine().charAt(0);
}
reader.close();

After that you can show if he typed N or Y and continue with your code