你想要把某个算法替换为另一个更清晰的算法。
将函数本体（method body）替换为另一个算法。
String foundPerson(String[] people) {
for(int i = 0; i < people.length; i++) {
if(people[i].equals("Don")) {
return "Don";
}
if(people[i].equals("John")) {
return "John";
}
if(people[i].equals("Kent")) {
return "Kent";
}
}
return "";
}
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\ /
String foundPerson(String[] people) {
List candidates = Arrays.asList(new String[],
{"Don", "John", "Kent"});
for(int i = 0; i < people.length; i++)
if(candidates.contains(people[i]))
return people[i];
return "";
}