Java How to Program, Early Objects, 11th Edition

... occupiedCells, "buffer cells:  ");
59
60         for (int value : buffer) {
61            System.out.printf(" %2d  ", value); // output values in buffer
62         }
63
64         System.out.printf("%n               ");
65
66         for (int i = 0; i < buffer.length; i++) {
67            System.out.print("---- ");
68         }
69
70         System.out.printf("%n               ");
71
72         for (int i = 0; i < buffer.length; i++) {
73            if (i == writeIndex && i == readIndex) {
74               System.out.print(" WR"); // both write and read index
75            }
76            else if (i == writeIndex) {
77               System.out.print(" W  "); // just write index
78            }
79            else if (i == readIndex) {
80               System.out.print("  R  "); // just read index
81            }
82            else {
83               System.out.print("  "); // neither index
84            }
85         }
86
87         System.out.printf("%n%n");
88      }
89   }

Synchronizing access to a shared three-element ...