在实际编程中,要尽量避免出现死锁的情况,但是让你故意写一个死锁的程序时似乎也不太简单(有公司会出这样的面试题),以下是一个简单的死锁例子。 线程的同步化可能会造成死锁,死锁发生在两…
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReade…
import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import ja…
import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; impo…
RandomAccessFile类: 此类的实例支持对随机访问文件的读取和写入。随机访问文件的行为类似存储在文件系统中的一个大型 byte 数组。存在指向该隐含数组,光标或索引,称…
import java.io.*; import java.sql.*; import org.apache.poi.hssf.usermodel.HSSFCell; import…
public class NetworkCheck { /** * 网络是否可用 */ public static boolean isNetworkAvailable(Conte…
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; impo…
DownLoadUtil.java import java.io.BufferedInputStream; import java.io.BufferedOutputStream;…
import java.io.File; import java.io.FileOutputStream; import java.io.FilenameFilter; impor…
import java.io.File; import java.io.InputStream; import java.io.RandomAccessFile; import j…
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; impo…
Java 自带的加密类MessageDigest类(加密MD5和SHA)
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