import java.util.concurrent.atomic.AtomicInteger;
AtomicInteger index=new AtomicInteger(0);
System.out.println(index.getAndIncrement());//0
System.out.println(index.getAndIncrement());//1
index.set(0);
System.out.println(index.get());//0
AtomicInteger_用法_写给自己参考的
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