Java 方法调用转换不能转换实参
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原文地址: http://stackoverflow.com/questions/18624961/
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actual argument cannot be converted by method invocation conversion
提问by Thufir
What is the correct way to add a charto charQueuewhich is a final ConcurrentLinkedQueue<Character>parameter?
什么是增加一个正确的方式char来charQueue这是一个final ConcurrentLinkedQueue<Character>参数？
Oracle seems to say that it shouldwork:
Oracle 似乎说它应该可以工作：
From type char to type Character
从字符类型到字符类型
http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.1.7
http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.1.7
code:
代码：
package telnet;
import static java.lang.System.out;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.logging.Logger;
public class InputStreamWorker {
private final static Logger LOG = Logger.getLogger(InputStreamWorker.class.getName());
public InputStreamWorker() {
}
public void print(final InputStream inputStream, final ConcurrentLinkedQueue<Character> charQueue) {
Thread print = new Thread() {
StringBuilder sb = new StringBuilder();
@Override
public void run() {
try {
char ch = (char) inputStream.read();
sb.append(ch);
while (255 > ch && ch >= 0) {
charQueue.add(ch);
ch = (char) inputStream.read();
System.out.print(ch);
}
} catch (IOException ex) {
out.println("cannot read inputStream:\t" + ex);
}
}
};
print.start();
}
}
Extract from build results:
从构建结果中提取：
-do-compile:
[mkdir] Created dir: /home/thufir/NetBeansProjects/TelnetConsole/build/empty
[mkdir] Created dir: /home/thufir/NetBeansProjects/TelnetConsole/build/generated-sources/ap-source-output
[javac] Compiling 11 source files to /home/thufir/NetBeansProjects/TelnetConsole/build/classes
[javac] /home/thufir/NetBeansProjects/TelnetConsole/src/telnet/InputStreamWorker.java:28: error: no suitable method found for add(char)
[javac] charQueue.add(ch);
[javac] ^
[javac] method ConcurrentLinkedQueue.add(Character) is not applicable
[javac] (actual argument char cannot be converted to Character by method invocation conversion)
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[javac] 1 error
回答by Menthos
You are right, it should work fine as method invocation conversion allows boxing conversion from charto Character.
Your code compiles fine on my machine, so I suspect a NetBean specific issue.
您是对的，它应该可以正常工作，因为方法调用转换允许从char到 的装箱转换Character。您的代码在我的机器上编译得很好，所以我怀疑是 NetBean 特定问题。
In the meantime, you can explicit the conversion from charto Characterto please the compiler. This should do the trick:
在此期间，您可以显式从转换char到Character取悦编译器。这应该可以解决问题：
char ch = Character.valueOf(inputStream.read());
回答by Thufir
The problem was of my own creation. In the same package was a Characterclass which was creating, obvious now, a naming conflict.
问题出在我自己的创作上。在同一个包中有一个Character类，它正在创建，现在很明显，命名冲突。
Renaming the class to MyCharacterand checking that the Queue used Characterhas fixed the bug.
将类重命名为MyCharacter并检查使用的队列Character是否修复了错误。
