java.util.concurrent package的API文檔陳述如下：

[…] Additionally, classes are provided only for those types that are commonly useful in intended applications. For example, there is no atomic class for representing byte. In those infrequent cases where you would like to do so, you can use an AtomicInteger to hold byte values, and cast appropriately. You can also hold floats using Float.floatToIntBits and Float.intBitstoFloat conversions, and doubles using Double.doubleToLongBits and Double.longBitsToDouble conversions.

我不是說(shuō)這是一個(gè)方便的解決方案，但這似乎是解釋。我想你可能想要包裝一個(gè)AtomicInteger，并提供訪問(wèn)方法getFloat / setFloat等。

我實(shí)際上寫(xiě)了一個(gè)。干得好：

import java.util.concurrent.atomic.AtomicInteger;

import static java.lang.Float.*;

class AtomicFloat extends Number {

private AtomicInteger bits;

public AtomicFloat() {

this(0f);

}

public AtomicFloat(float initialValue) {

bits = new AtomicInteger(floatToIntBits(initialValue));

}

public final boolean compareAndSet(float expect, float update) {

return bits.compareAndSet(floatToIntBits(expect),

floatToIntBits(update));

}

public final void set(float newValue) {

bits.set(floatToIntBits(newValue));

}

public final float get() {

return intBitsToFloat(bits.get());

}

public float floatValue() {

return get();

}

public final float getAndSet(float newValue) {

return intBitsToFloat(bits.getAndSet(floatToIntBits(newValue)));

}

public final boolean weakCompareAndSet(float expect, float update) {

return bits.weakCompareAndSet(floatToIntBits(expect),

floatToIntBits(update));

}

public double doubleValue() { return (double) floatValue(); }

public int intValue() { return (int) get(); }

public long longValue() { return (long) get(); }

}

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