java多线程交替打印数字和字母

来源：互联网发布：软件过程编辑：程序博客网时间：2024/05/21 17:16

题目：

1.开启两个线程，一个线程打印A～Z，另一个线程打印1～52的数据。

2.实现交替打印，输出结果为12A34B………..5152Z.

3.请用多线程方式实现。

使用阻塞队列实现

class NumberPrinter extends Thread{    private BlockingQueue<String> bp;    public NumberPrinter(BlockingQueue<String> bp) {        super();        this.bp = bp;    }    @Override    public void run() {        super.run();        for(int i=1;i<53;i++){            try {                System.out.print(i);                bp.put((i)+""+(i+1));                Thread.sleep(2);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}class LetterPrinter extends Thread{    private BlockingQueue<String> bp;    public LetterPrinter(BlockingQueue<String> bp) {        super();        this.bp = bp;    }    @Override    public void run() {        super.run();        char ch ='A';        for (int i = 0; i < 26; i++) {                  try {                bp.take();                bp.take();                System.out.print((char) (ch + i));                Thread.sleep(2);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}public class T16{    private final Lock lock = new ReentrantLock();    private final Condition con = lock.newCondition();    public static void main(String[] args){        BlockingQueue<String> bp = new ArrayBlockingQueue<>(2);        LetterPrinter t1= new LetterPrinter(bp);        NumberPrinter t2 = new NumberPrinter(bp);        t1.start();        t2.start();    }}

使用原子变量

public class T16_2 {    public static AtomicInteger countAtomicInteger=new AtomicInteger(0);    /**     * @param args     */    public static void main(String[] args) {        // 打印字母        Thread t1 = new Thread(){            @Override            public void run() {                int i=0;                char ch = 'A';                while(true){                    if(i>=26){return;}                    if(countAtomicInteger.get()==2 && i<26){                        System.out.print((char)(ch+i));                        countAtomicInteger.set(0);                        i++;                    }                }            }        };        // 打印数字        Thread t2 = new Thread(){            @Override            public void run() {                int i=1;                while(true){                    if(i>52)return;                    if(countAtomicInteger.get()<2 && i<=52){                        countAtomicInteger.incrementAndGet();                        System.out.print(i);                        i++;                    }                }            }        };        t1.start();        t2.start();    }}

使用Condition

public class T16_3 {    static boolean letterFlag=true;    static boolean numFlag=true;    static Lock lock = new ReentrantLock();    static Condition letterCondition = lock.newCondition();    static Condition numCondition = lock.newCondition();    static boolean flag=true;    /**     * @param args     */    public static void main(String[] args) {        new Thread(new Runnable(){            @Override            public void run() {                char ch = 'A';                int i=0;                while(i<26){                    lock.lock();                    try{                        if(flag){                            letterCondition.await();                        }                        System.out.print((char)(ch+i));                        i++;                        flag=true;                        numCondition.signal();                    }catch(Exception e){                        e.printStackTrace();                    }finally{                        lock.unlock();                    }                }            }        }).start();        //打印数字的线程        new Thread(new Runnable(){            @Override            public void run() {                int i=1;                while(i<53){                    lock.lock();                    try{                        if(!flag){                            numCondition.await();                        }                        System.out.print(i+""+(i+1));                        i+=2;                        flag=false;                        letterCondition.signal();                    }catch(Exception e){                        e.printStackTrace();                    }finally{                        lock.unlock();                    }                }            }        }).start();    }}

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