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copied!<p>Hold address as it should be -- as 32-bit integer, and increment it in this form. Convert it from or to <code>String</code> only if required. Example is below. My <code>IPAddress</code> class is complete and functional.</p> <pre><code>class IPAddress { private final int value; public IPAddress(int value) { this.value = value; } public IPAddress(String stringValue) { String[] parts = stringValue.split("\\."); if( parts.length != 4 ) { throw new IllegalArgumentException(); } value = (Integer.parseInt(parts[0], 10) << (8*3)) & 0xFF000000 | (Integer.parseInt(parts[1], 10) << (8*2)) & 0x00FF0000 | (Integer.parseInt(parts[2], 10) << (8*1)) & 0x0000FF00 | (Integer.parseInt(parts[3], 10) << (8*0)) & 0x000000FF; } public int getOctet(int i) { if( i<0 || i>=4 ) throw new IndexOutOfBoundsException(); return (value >> (i*8)) & 0x000000FF; } public String toString() { StringBuilder sb = new StringBuilder(); for(int i=3; i>=0; --i) { sb.append(getOctet(i)); if( i!= 0) sb.append("."); } return sb.toString(); } @Override public boolean equals(Object obj) { if( obj instanceof IPAddress ) { return value==((IPAddress)obj).value; } return false; } @Override public int hashCode() { return value; } public int getValue() { return value; } public IPAddress next() { return new IPAddress(value+1); } } public class App13792784 { /** * @param args */ public static void main(String[] args) { IPAddress ip1 = new IPAddress("192.168.0.1"); System.out.println("ip1 = " + ip1); IPAddress ip2 = new IPAddress("192.168.0.255"); System.out.println("ip2 = " + ip2); System.out.println("Looping:"); do { ip1 = ip1.next(); System.out.println(ip1); } while(!ip1.equals(ip2)); } } </code></pre>

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