HexToInteger:
public class HexToInteger { public static void main(String[] args){ int cid = 78823423; System.out.println((short)0x00000FFFF); //(short)0x00000FFFF == 0xFFFF 结果为-1 System.out.println(cid & (short)0x00000FFFF); //0x004B2BFF & 0xFFFFFFFF 结果为78823423 System.out.println(cid & 0x00000FFFF); //0x004B2BFF & 0x0000FFFF 结果为49151 System.out.println(Integer.parseInt(Integer.toHexString(cid & 0x00000FFFF), 16)); //49151 System.out.println(Integer.parseInt(String.valueOf(cid & 0x00000FFFF), 16)); //0x49151 == 299345 System.out.println(String.valueOf(cid & 0x00000FFFF)); //49151 } }
equals的使用:
public class User { String name; int age; public User(String name, int age){ this.name = name; this.age = age; } public boolean equals(Object obj){ if(this == obj){ //this代表调用这个函数的那个对象,这个函数位于//User这个类中,则this要调用它,必须为User类型 return true; } boolean b = obj instanceof User; if(b){ User u = (User)obj; if(this.age == u.age && this.name.equals(u.name)){//基本数据类型用==,引用数据类型用equals return true; }else{ return false; } } else{ return false; } } public int hashCode(){ int result = 17; result = 31 * result + age; result = 31 * result + name.hashCode(); return result; } }
HashSet:
import java.util.HashSet; import java.util.Set; public class HashSetTest { public static void main(String[] args) { // TODO Auto-generated method stub Set<String> set = new HashSet<String>(); set.add("a"); set.add("b"); set.add("c"); set.add("d"); set.add("c"); int i = set.size(); set.remove("a"); } }
简单加密算法:
import java.io.UnsupportedEncodingException; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.Queue; import skycomm.db.ConnectOracle; import skycomm.db.ConnectSqlite; public class TestMain { /** * 位置信息解密的key值 */ private final static String DECODE_KEYS_ZONE = "skycomm"; public Map<String, String> encMap; public Map<String, String> decMap; public List<ImsiToAddress> list; public Queue<Object[]> data; public TestMain() { list = new ArrayList<ImsiToAddress>(); } /** * @param args */ public static void main(String[] args) { ConnectSqlite sqlite = new ConnectSqlite(); Map<String, String> map = sqlite.selectTable(); TestMain tm = new TestMain(); for (String key : map.keySet()) { String addr = map.get(key); String addrEnc = tm.enDec(addr); if (addrEnc.equals("广东 深圳")) { System.out.println("addr ++++++++++++++++++ " + addrEnc); } System.out.println("addr " + addrEnc); } // ConnectOracle oracle = new ConnectOracle(); // ResultSet rs = oracle.selectImsiToAddress("INFO_IMSITOADDRESSENC"); // // TestMain tm = new TestMain(); // try { // // while (rs.next()) { // String imsi = rs.getString("imsi"); // String addrDec = rs.getString("address"); // // if (!imsi.equals("")) { // // tm.decMap.put(imsi, addrDec); // // // 加密 // String encAddr = tm.enDec(addrDec); // ImsiToAddress im = new ImsiToAddress(); // im.setImsi(imsi); // im.setAddress(encAddr); // // tm.list.add(im); // } // } // // ConnectSqlite sqlite = new ConnectSqlite(); // sqlite.InsertWithTransaction(tm.list, "tb_CodeToAddress"); // } catch (SQLException e) { // e.printStackTrace(); // } // oracle.close(); } /** * 解密位置信息 * * @param addr * 位置信息 * @return */ private String enDec(String addr) { byte b_addr[]; byte b_key[]; try { b_addr = addr.getBytes("GBK"); b_key = DECODE_KEYS_ZONE.getBytes("GBK"); for (int i = 0; i < b_addr.length;) { for (int j = 0; j < b_key.length && i < b_addr.length; ++i, ++j) { b_addr[i] ^= b_key[j]; } } return new String(b_addr, "GBK"); } catch (UnsupportedEncodingException e) { return ""; } } }