Buffer的几个属性跟方法速记

2012-10-21

Buffer的几个属性和方法速记?java.nio.Buffer??属性?mark?positionlimit一般情况下limitcatacitycapacit

Buffer的几个属性和方法速记

java.nio.Buffer?

属性

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

查询类方法

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

改变类方法

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;

if (position > limit) position = limit;

if (mark > limit) mark = -1;

position()

position = newPosition;

if (mark > position) mark = -1;

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

position(remaining());

limit(capacity());

compactslice

new HeapIntBuffer(hb,

-1,

this.remaining(),

this.position() + offset);

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

duplicate

?new HeapByteBuffer(hb,

this.markValue(),

this.position(),

this.limit(),

this.capacity(),

offset);

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

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