验证StringBuilder是非线程安全的Java小程序

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以上程序创建了四个线程，同时向同一个StringBuilder中append字符串，运行结果：

Exception in thread "Thread-1" java.lang.ArrayIndexOutOfBoundsException        at java.lang.System.arraycopy(Native Method)        at java.lang.String.getChars(String.java:826)        at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:416)        at java.lang.StringBuilder.append(StringBuilder.java:132)        at MyThread.run(ThreadTest.java:17)aaaaaaaaaaaaaaaa          baaa a a a a a b b b aaa ab ab a bbbb a bb aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaadaa a a  d d d d d d d d c dd d d d a d d d a cc da ac  c  c c ad da a a a cac acc c c aa a a a cc c dcacc c c c c c c acad cc ddad cc c  c c c c c  d             c a a a a d a d c  a cdcaca cdcc c  acad adad a ad a a a a a a a cc c c acacacc c c acacc c aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

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