方案一：

public class PrintABC {public static void main(String[] args) {AtomicInteger synObj = new AtomicInteger(0);Runnable r = new ThreadModel(synObj);new Thread(r,"A").start();new Thread(r,"B").start();new Thread(r,"C").start();} }public class ThreadModel implements Runnable {public volatile AtomicInteger ato;public ThreadModel(AtomicInteger ato) {this.ato = ato;}public void run() {for(int i=0;i<10;i++) {synchronized(ato) {if(ato.get()%3==0) {System.out.println("A);ato.set(ato.get()+1);ato.notifyAll();} else if(ato.get()%3==1) {System.out.println("B);ato.set(ato.get()+1);ato.notifyAll();} else if(ato.get()%3==2) {System.out.println("C);ato.set(ato.get()+1);ato.notifyAll();} else {ato.wait();}}}} }

方案二：

public class printABC {public static void main(String [] args) {AtomicInteger ato = new AtomicInteger(0);ThreadModel modelA = new ThreadModel(ato,"A",0);ThreadModel modelB = new ThreadModel(ato,"B",0);ThreadModel modelC = new ThreadModel(ato,"C",0);new Thread(modelA).start();new Thread(modelB).start();new Thread(modelC).start();}}public class ThreadModel {private AtomicInteger ato;private String printChar;private int flag;private int count = 0;public ThreadModel(AtomicInteger ato,String printChar,int flag) {this.ato = ato;this.printChar = printChar;this.flag = flag;}public void run() {synchronized(ato) {while(true) {if(ato.get()%3==flag) {System.out.println(printChar);ato.set(ato.get()+1);ato.notifyAll();count++;if(count==10) {break;}}else {ato.wait();}}}}}

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