Java 无法导入 Map.Entry
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Cannot import Map.Entry
提问by Ewa Kania
I have problems with import Map.Entry. Even though I have import import java.util.Map.Entry - there is an error : "The import java.util.Map.Entry cannot be resolved". And entrySet() method doesnot work. what is the problem? (I use jre8)
我在导入 Map.Entry 时遇到问题。即使我导入了 import java.util.Map.Entry - 也有一个错误：“无法解析导入 java.util.Map.Entry”。并且 entrySet() 方法不起作用。问题是什么？（我使用jre8）
import java.io.File;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import org.biojava3.core.sequence.ProteinSequence;
import org.biojava3.core.sequence.io.FastaReaderHelper;
public class Main {
/**
* @param args
*/
public static void main(String[] args) throws Exception {
LinkedHashMap<String, ProteinSequence> a = FastaReaderHelper.readFastaProteinSequence(new File("A2RTH4.fasta"));
for (Map.Entry<String, ProteinSequence> entry : a.entrySet(); //entrySet A map entry (key-value pair).
{
System.out.println( entry.getValue().getOriginalHeader() + "=" + entry.getValue().getSequenceAsString() );
}
}
}
回答by user840718
import java.util.Mapis enough
import java.util.Map足够
Try this code, should be work:
试试这个代码，应该可以工作：
public static void main(String[] args) throws Exception {
LinkedHashMap<String, ProteinSequence> a = FastaReaderHelper.readFastaProteinSequence(new File("A2RTH4.fasta"));
Set entrySet = a.entrySet();
Iterator it = entrySet.iterator();
// Iterate through LinkedHashMap entries
System.out.println("LinkedHashMap entries : ");
while(it.hasNext())
System.out.println(it.next());
}
}
Instead of foreach, try an Iterator to iterate over a LinkedHashMap data structure.
尝试使用 Iterator 来迭代 LinkedHashMap 数据结构，而不是 foreach。
回答by Nikhil Talreja
for(Map.Entry<String, Integer> entry : someMap.entrySet())
works with import java.util.Mapimport alone.
import java.util.Map单独使用导入。
回答by Ian Roberts
for (Map.Entry<String, ProteinSequence> entry : a.entrySet();
should be
应该
for (Map.Entry<String, ProteinSequence> entry : a.entrySet())
(closing parenthesis instead of semicolon).
（右括号而不是分号）。
