为什么我在这个代码中接收Java的IllegalFormatConversionException？ [英] Why am I receiving IllegalFormatConversionException in Java for this code?

问题描述

我目前正在研究从网络获取数据并在JTextArea上打印出来的代码。在这之间，我试图根据小数位数来对齐数字。这是执行小数对齐之前的代码：

I am currently working on a code that takes data from the network and print it out on a JTextArea. In between, I am trying to alignment the number based on the decimal position. This is the code that works before implementing the decimal alignment:

private static final String NewLine = System.getProperty("line.separator");
String NetString = "";
byte[] data = p.getData();
NewString += "SID:     " + BuildShort(data,4) + NewLine;
NewString += "DID:     " + BuildShort(data,6) + NewLine;

这是新的

And this is the new one

NewString += String.format("%-8s%11.5f" + NewLine, "SID    : ", BuildShort(data,4));
NewString += String.format("%-8s%11.5f" + NewLine, "DID    : ", BuildShort(data,6));

我收到错误讯息

which I received the error message

Exception in thread "Thread-2" java.util.IllegalFormatConversionException: f != java.lang.Integer
at java.util.Formatter$FormatSpecifier.failConversion(Unknown Source)
at java.util.Formatter$FormatSpecifier.printFloat(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.lang.String.format(Unknown Source)
at MT302.ParsePacket(MT302.java:97)
at MK20_DataView.run(MK20_DataView.java:261)
at java.lang.Thread.run(Unknown Source)

你知道我为什么收到这个错误吗？

Do you know why I am receiving this error?

推荐答案

BuildShort 方法返回一个整数，然后给它一个float的格式模式。只要在它前面粘贴一个 double >，就可以了：

You are receiving the error because your BuildShort method returns an integer, and you're giving it a format pattern for a float. Just stick a double cast in front of it, it should be fine:

NewString += String.format("%-8s%11.5f" + NewLine, "SID    : ", (double)BuildShort(data,4));

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