Card 23 / 32: public class Test116 { static final StringBuffer sb1 = new StringBuffer(); static final StringBuffer sb2 = new StringBuffer(); public static void main(String[] args) { new Thread(){ public void run(){ synchronized (sb1) { sb1.append("A"); sb2.append("B"); } } }.start(); new Thread(){ public void run(){ synchronized (sb1) { sb1.append("C"); sb2.append("D"); } } }.start(); System.out.println(sb1+" "+sb2); } }
A) AB CD
B) BC DA
C) AC BD
D) ADBC

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