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  • AtomicInteger

    public class AtomicInteger extends Number implements java.io.Serializable {
        private static final long serialVersionUID = 6214790243416807050L;
    
        // setup to use Unsafe.compareAndSwapInt for updates
        private static final Unsafe unsafe = Unsafe.getUnsafe();
        private static final long valueOffset;
    
        static {
            try {
                valueOffset = unsafe.objectFieldOffset
                    (AtomicInteger.class.getDeclaredField("value"));
            } catch (Exception ex) { throw new Error(ex); }
        }
    
        private volatile int value;
    
        public AtomicInteger(int initialValue) {
            value = initialValue;
        }
    
        public AtomicInteger() {
        }
    
        public final int get() {
            return value;
        }
    
        public final void set(int newValue) {
            value = newValue;
        }
    
        public final void lazySet(int newValue) {
            unsafe.putOrderedInt(this, valueOffset, newValue);
        }
    
        public final int getAndSet(int newValue) {
            return unsafe.getAndSetInt(this, valueOffset, newValue);
        }
    
        public final boolean compareAndSet(int expect, int update) {
            return unsafe.compareAndSwapInt(this, valueOffset, expect, update);
        }
    
        public final boolean weakCompareAndSet(int expect, int update) {
            return unsafe.compareAndSwapInt(this, valueOffset, expect, update);
        }
    
        public final int getAndIncrement() {
            return unsafe.getAndAddInt(this, valueOffset, 1);
        }
    
        public final int getAndDecrement() {
            return unsafe.getAndAddInt(this, valueOffset, -1);
        }
    
        public final int getAndAdd(int delta) {
            return unsafe.getAndAddInt(this, valueOffset, delta);
        }
    
        public final int incrementAndGet() {
            return unsafe.getAndAddInt(this, valueOffset, 1) + 1;
        }
    
        public final int decrementAndGet() {
            return unsafe.getAndAddInt(this, valueOffset, -1) - 1;
        }
    
        public final int addAndGet(int delta) {
            return unsafe.getAndAddInt(this, valueOffset, delta) + delta;
        }
    
        public final int getAndUpdate(IntUnaryOperator updateFunction) {
            int prev, next;
            do {
                prev = get();
                next = updateFunction.applyAsInt(prev);
            } while (!compareAndSet(prev, next));
            return prev;
        }
    
        public final int updateAndGet(IntUnaryOperator updateFunction) {
            int prev, next;
            do {
                prev = get();
                next = updateFunction.applyAsInt(prev);
            } while (!compareAndSet(prev, next));
            return next;
        }
    
        public final int getAndAccumulate(int x,
                                          IntBinaryOperator accumulatorFunction) {
            int prev, next;
            do {
                prev = get();
                next = accumulatorFunction.applyAsInt(prev, x);
            } while (!compareAndSet(prev, next));
            return prev;
        }
    
        public final int accumulateAndGet(int x,
                                          IntBinaryOperator accumulatorFunction) {
            int prev, next;
            do {
                prev = get();
                next = accumulatorFunction.applyAsInt(prev, x);
            } while (!compareAndSet(prev, next));
            return next;
        }
    
        public String toString() {
            return Integer.toString(get());
        }
    
        public int intValue() {
            return get();
        }
        public long longValue() {
            return (long)get();
        }
    
        public float floatValue() {
            return (float)get();
        }
    
        public double doubleValue() {
            return (double)get();
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/yaowen/p/10753937.html
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