常见可序列化数据结构与普通数据结构的相互转换

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)；