JAVA多线程设计模式一 Single Threaded Execution
public class Gate {private int counter = 0;private String name = "Nobody";private String address = "Nowhere";public synchronized void pass(String name, String address) {this.counter++;this.name = name;try {Thread.sleep(1000);} catch (InterruptedException e) {}this.address = address;check();}public String toString() {return "No." + counter + ": " + name + ", " + address;}private void check() {if (name.charAt(0) != address.charAt(0)) {System.out.println("***** BROKEN ***** " + toString());}}}?
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public class UserThread extends Thread {private final Gate gate;private final String myname;private final String myaddress;public UserThread(Gate gate, String myname, String myaddress) {this.gate = gate;this.myname = myname;this.myaddress = myaddress;}public void run() {System.out.println(myname + " BEGIN");while (true) {gate.pass(myname, myaddress);}}}?
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public class Main { public static void main(String[] args) { System.out.println("Testing Gate, hit CTRL+C to exit."); Gate gate = new Gate(); new UserThread(gate, "Alice", "Alaska").start(); new UserThread(gate, "Bobby", "Brazil").start(); new UserThread(gate, "Chris", "Canada").start(); }}?
Gate 类中的方法，同步关键字的有无。 执行程序看看。