复制public class ConcurrencyTest { private static final long count = 1000000000; publicstatic void main(String[] args) { try { concurrency(); } catch (InterruptedException e) { e.printStackTrace(); } serial(); } private static void concurrency() throws InterruptedException { long start = System.currentTimeMillis(); Thread thread = new Thread(new Runnable() { @Override public void run() { int a = 0; for (long i = 0; i < count; i++) { a += 5; } } }); thread.start(); int b = 0; for (long i = 0; i < count; i++) { b--; } thread.join(); long time = System.currentTimeMillis() - start; System.out.println("concurrency : " + time + "ms,文弄b=" + b); } private static void serial() { long start = System.currentTimeMillis(); int a = 0; for (long i = 0; i < count; i++) { a += 5; } int b = 0; for (long i = 0; i < count; i++) { b--; } long time = System.currentTimeMillis() - start; System.out.println("serial : " + time + "ms,b=" + b); } } 1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.
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