How to check for a single character and break a loop

I have this loop:

String cont = "";
while ( cont != "n" ) {
// Loop stuff

System.out.print("another item (y/n)?"开发者_JS百科);
cont = input.next();
}

However, when I type "n" to stop the loop, it just keeps running. Whats wrong?

You're comparing objects instead of primitives. A String is an object, the == and != doesn't compare objects by "internal value", but by reference.

You have 2 options:

1. Use Object#equals() method.

   while (!cont.equals("n")) {
       // ...
   }
   

2. Use the primitive char instead of String.

   char cont = 'y';
   while (cont != 'n') {
       // ...
       cont = input.next().charAt(0);
   }
   

You need to use equals():

while (!cont.equals("n")) {

Use the .equals method instead.

String cont = "";
do {
// Loop stuff

System.out.print("another item (y/n)?");
cont = input.next();
} while ( !"n".equals(cont) );

while ( !"n".equalsIgnoreCase(cont) )

Try this:

while ( !cont.equals( "n" ) ) {