Buffer的几个属性和方法速记

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java.nio.Buffer?

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属性

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mark?position
limit一般情况下limit==catacitycapacity此属性一经设置，就不会改变remainglimit-positionaddress?

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查询类方法

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remaining?limit - position;?hasRemaininglimit?< position;?

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改变类方法

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markmark=position;resetposition=mark;clear

position=0;

limit=capacity;

mark=-1;

flip

limit=position;

position=0;

mark=-1;

rewind

position=0;

mark=-1;

limit()

limit=newLimit;

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if (position > limit) position = limit;

if (mark > limit) mark = -1;

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position()

position = newPosition;

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if (mark > position) mark = -1;

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System.arraycopy(hb, ix(position()), hb, ix(0), remaining());

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position(remaining());

limit(capacity());

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compactslice

new HeapIntBuffer(hb,

-1,

0,

this.remaining(),

this.remaining(),

this.position() + offset);

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共享底层存储byte[]mark=-1;position=0;limit=remaining;capacity=remaing;offset = offset+position;

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duplicate

?new HeapByteBuffer(hb,

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this.markValue(),

this.position(),

this.limit(),

this.capacity(),

offset);

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共享底层存储byte[]mark=mark;position=position;limit=limit;capacity=capacity;offset = offset;

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