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package practice.iting.tistory.com; import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.InetAddress;import java.net.ServerSocket;import java.net.Socket;import java.text.SimpleDateFormat;import java.util.Date; public class EchoServer { public static void m..

public int increase() { synchronized(this) { return ++count; } } public synchronized int increase() { return ++count; }

public class Test implements Runnable { int seq; public Test(int seq) { this.seq = seq; } public void run() { System.out.println(this.seq+" thread start."); try { Thread.sleep(1000); }catch(Exception e) { } System.out.println(this.seq+" thread end."); } public static void main(String[] args) { ArrayList threads = new ArrayList(); for(int i=0; i