可序列化数据结构与普通数据结构的相互转换问题

String转Text：

String line="abcdefg";

Text text=new Text(line);

Text转String:

(Text values)

String line=values.toString;

int转IntWritable:

IntWritable one=new IntWritable(1);

IntWritable转int:

int sum=0;

while(values.hasNext()){

   sum+=values.next().get();

}

boolean数组转ArrayWritable

ArrayWritable ant=new ArrayWritable(BooleanWritable.class);

BooleanWritable[] arr = new BooleanWritable[obNum];

for (){

   arr[i] = new BooleanWritable(true);

}

ant.set(arr); 

ArrayWritable转boolean数组

ArrayWritable arr = values.next();

    Object[] objs = arr.get();

    for (Object obj: objs){

    Boolean b = (Boolean)obj;

}

ArrayWritable转其他类型

values是ArrayWritable

Object []d=(Object [])values.toArray();

double mone = (Double)d[0];

boolean数组转化ArrayWritable

ArrayWritable arr;

boolean[] array

try{

this.arr = IO.makeWritableArray(boolean.class, array);

}catch(ClassNotFoundException e){

e.printStackTrace();

}

ArrayWritable转化boolean数组

array=IO.extractBoolArray(arr)；