我正在尝试为练习程序编写一个映射器类,编译器总是给我错误: satMath和satVerbal可能尚未初始化。Java范围错误
public class UniversityMapper extends Mapper <LongWritable,Text,Text,IntWritable> {
public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
// TODO convert record (value) to String
StringTokenizer iterator = new StringTokenizer (value.toString(),")");
int state = 2;
int satVerbal;
int satMath;
while(state != 0 && iterator.hasMoreTokens())
{
String cur = iterator.nextToken();
if (cur.contains("sat verbal"))
{
state--;
StringTokenizer temp = new StringTokenizer(cur,"\\s+");
temp.nextToken();
temp.nextToken();
int satV = (new Integer(temp.nextToken())).intValue();
satVerbal = satV;
//context.write(new Text("satv"), new IntWritable(satVerbal));
}
else if (cur.contains("sat math"))
{
state--;
StringTokenizer temp = new StringTokenizer(cur,"\\s+");
temp.nextToken();
temp.nextToken();
int satM = (new Integer(temp.nextToken())).intValue();
satMath = satM;
//context.write(new Text("satm"), new IntWritable(satMath));
}
}
if (state == 0)
{
System.out.println(satVerbal);
System.out.println(satMath);
context.write(new Text ("satv"), new IntWritable(satVerbal));
context.write(new Text ("satm"), new IntWritable(satMath));
}
} }
如果我重新定位的if语句(代码中的注释),我不再收到此错误范围内context.write()方法。我不明白为什么。我通常使用C++和python编码我对Java真的很陌生,我需要完成这个程序。有人可以帮助我,预先感谢:)
这与范围界定无关 - 变量处于正确的范围内。这是与[明确的任务](https://docs.oracle.com/javase/specs/jls/se7/html/jls-16.html)。 –
非常感谢你...... N现在我觉得很愚蠢,不应该是其他情况,如果它应该是:P –