地区分类 数组 Java NIO 缓冲区基础二(5)

结果：

pos=0, limit=10, capacity=10:'java.nio.HeapByteBuffer[pos=0 lim=10 cap=10]'

pos=0, limit=5, capacity=5:'Hello'

可以看到，转换为视图后，limit和capacity都变了。

6、数据元素视图

上面的视图使用了一个视图类来转换。在ByteBuffer中，我们可以直接获取不同视图的元素。

public abstract class ByteBuffer
extends Buffer implements Comparable {
public abstract char getChar( ); 
public abstract char getChar (int index); 
public abstract short getShort( ); 
public abstract short getShort (int index); 
public abstract int getInt( ); 
public abstract int getInt (int index); 
public abstract long getLong( ); 
public abstract long getLong (int index); 
public abstract float getFloat( );
public abstract float getFloat (int index);
public abstract double getDouble( ); 
public abstract double getDouble (int index); 
public abstract ByteBuffer putChar (char value); 
public abstract ByteBuffer putChar (int index, char value); 
public abstract ByteBuffer putShort (short value); 
public abstract ByteBuffer putShort (int index, short value); 
public abstract ByteBuffer putInt (int value); 
public abstract ByteBuffer putInt (int index, int value); 
public abstract ByteBuffer putLong (long value); 
public abstract ByteBuffer putLong (int index, long value); 
public abstract ByteBuffer putFloat (float value); 
public abstract ByteBuffer putFloat (int index, float value); 
public abstract ByteBuffer putDouble (double value); 
public abstract ByteBuffer putDouble (int index, double value); 
}

这些操作一看便知。前面也提过其实就是根据大端小端的字节顺序，和这些数据类型的长度来组织数据。

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