Java之线程通信一

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写2个线程，其中一个打印1-52，另一个打印A-Z，打印顺序是12A34B56C….5152Z。这里使用线程通信的方式控制上面的打印顺序。

Printer类：

该类提供两个同步方法printChar()和printNumber()，分别打印字符和数字。通过两个打印线程之间的通信控制：每打印两个数字后，打印一个字符，如此循环。代码如下：

public class Printer{    private int printCount = 0;    public synchronized void printNumber()    {        try        {            for (int i = 1 ; i <= 52 ; i++ , printCount++)            {                if (printCount > 1)                {                    i--;                    wait();                }                else                {                    Log.d("Thread", i + "");                    if (printCount == 1)                    {                        notifyAll();                    }                }            }        }        catch (InterruptedException e)        {            e.printStackTrace();        }    }    public synchronized void printChar()    {        try        {            for (char c = 'A' ; c <= 'Z' ; c++)            {                if (printCount <= 1)                {                    c--;                    wait();                }                else                {                    Log.d("Thread" , c + "");                    printCount = -1;                    notifyAll();                }            }        }        catch (InterruptedException ex)        {            ex.printStackTrace();        }    }}

两个打印线程：

public class NumberThread extends Thread{    private Printer printer;    public NumberThread(Printer printer)    {        this.printer = printer;    }    @Override    public void run()    {        printer.printNumber();    }}

public class CharThread extends Thread{    private Printer printer;    public CharThread(Printer printer)    {        this.printer = printer;    }    @Override    public void run()    {        printer.printChar();    }}

MainActivity类：

public class MainActivity extends Activity{    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.main_activity);        Printer printer = new Printer();        new NumberThread(printer).start();        new CharThread(printer).start();    }}

完毕，很简单的例子。

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