我正在做 Junit 教程,遇到了正在测试的标准化函数。它的定义如下:
public static String normalizeWord(String word) {
try {
int i;
Class<?> normalizerClass = Class.forName("java.text.Normalizer");
Class<?> normalizerFormClass = null;
Class<?>[] nestedClasses = normalizerClass.getDeclaredClasses();
for (i = 0; i < nestedClasses.length; i++) {
Class<?> nestedClass = nestedClasses[i];
if (nestedClass.getName().equals("java.text.Normalizer$Form")) {
normalizerFormClass = nestedClass;
}
}
assert normalizerFormClass.isEnum();
Method methodNormalize = normalizerClass.getDeclaredMethod(
"normalize",
CharSequence.class,
normalizerFormClass);
Object nfcNormalization = null;
Object[] constants = normalizerFormClass.getEnumConstants();
for (i = 0; i < constants.length; i++) {
Object constant = constants[i];
if (constant.toString().equals("NFC")) {
nfcNormalization = constant;
}
}
return (String) methodNormalize.invoke(null, word, nfcNormalization);
} catch (Exception ex) {
return null;
}
}
这个功能如何运作?它实际上在做什么?
它的作用与以下相同:
import java.text.Normalizer;
try {
return Normalizer.normalize(word, Normalizer.Form.NFC);
} catch (Exception ex) {
return null;
}
只不过所有操作都是通过反射执行的。
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