HexToInteger:
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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：
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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:
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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：
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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
"";
}
}
} |