Java中的参数化字符串

Question

我发现自己经常想要在其中编写带有参数占位符的可重用字符串,几乎与您在SQL PreparedStatement中找到的完全相同.

这是一个例子

private static final String warning = "You requested ? but were assigned ? instead.";

public void addWarning(Element E, String requested, String actual){

     warning.addParam(0, requested);
     warning.addParam(1, actual);
     e.setText(warning);
     //warning.reset() or something, I haven't sorted that out yet.
}

Java中是否存在类似的内容？或者,有没有更好的方法来解决这样的问题？

我真正想问的是:这是理想的吗？

Answer 1

String.format()

从Java 5开始,您可以使用String.format参数化字符串.例:

String fs;
fs = String.format("The value of the float " +
                   "variable is %f, while " +
                   "the value of the " + 
                   "integer variable is %d, " +
                   " and the string is %s",
                   floatVar, intVar, stringVar);

请参见http://docs.oracle.com/javase/tutorial/java/data/strings.html

或者,您可以创建一个包装器,String以便做更多花哨的事情.

MessageFormat

根据Max的评论和Affe的回答,您可以使用MessageFormat类本地化参数化的String .

Answer 2

你可以用String.format.就像是:

String message = String.format("You requested %2$s but were assigned %1$s", "foo", "bar");

会产生

"You requested bar but were assigned foo"

Answer 3

它是内置的,是的.您正在寻找的类是java.text.MessageFormat