gistfile1.txt

public class Test {
    public static void main(String... args) {
        String x = new String(new char[] {'a', 'b', 'c'});
        String y = new String(new char[] {'d', 'e', 'f'});
        
        String xy = x + y;
        xy.intern();

        // With this line here, the output is true
        // which shows that the literal here is only taken
        // from the string pool at the point of execution.
        // If this line is moved to before the xy.intern()
        // call, the result is false
        String abcdef = "abcdef";
        System.out.println(abcdef == xy);
    }
}

Why don't you add the file extension instead of .txt?