1 package com.java7.showbitsdemo; 2 /* 3  * Try This 5-3 4  * A class that displays the binary representation of a value. 5  */ 6 class ShowBits { 7     int numbits; 8      9     ShowBits(int n) {10         numbits = n;11     }12     13     void show(long val) {14         long mask = 1;15         16         // left-shift a 1 into the proper position17         mask <<= numbits-1;18         19         int spacer = 0;20         for(; mask != 0; mask >>>=1) {21             if((val & mask) != 0) System.out.print("1");22             else System.out.print("0");23             spacer++;24             if((spacer % 8) == 0) {25                 System.out.print("");26                 spacer = 0;27             }28         }29         System.out.println();30     }31 }32 33 // Demonstrate ShowBits.34 class ShowBitsDemo {35     public static void main(String[] args) {36         ShowBits b = new ShowBits(8);37         ShowBits i = new ShowBits(32);38         ShowBits li = new ShowBits(64);39         System.out.println("123 in binary: ");40         b.show(123);41         42         System.out.println("\n87987 in binary: ");43         i.show(87987);44         45         System.out.println("\n237658768 in binary: ");46         li.show(237658768);47         48         // you can also show low-order bits of any integer49         System.out.println("\nLow order 8 bits of 87987 in binary: ");50         b.show(87987);51     }52 }