Java重构示例五(共9页).docx
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1、精选优质文档-倾情为你奉上Java重构示例五关键字:Java 程序设计 重构 示例 技巧 原则 优化 方法序言本文通过Java示例代码片段展示了常用重构原则和技巧,供初级开发人员参考。精致的代码能够清楚传达作者的意图,精致的代码是最好的注释,精致的代码非常容易维护和扩展。程序员阅读精致的代码如同大众欣赏优美的散文一样享受。21 使用类替换类型代码21.1 重构前public class LabelComparator implements Comparator, Serializable private static final long serialVersionUID = 1L; publ
2、ic static final int ASC = 1; public static final int DESC = 2; private int sortType = ASC; public LabelComparator() public LabelComparator(int sortType) this.sortType = sortType; public int compare(Object o1, Object o2) if (o1 = null & o2 = null) return 0; if (o1 = null) return -1; if (o2 = null) re
3、turn -1; if (Label) o1).getIndex() (Label) o2).getIndex() return (sortType = ASC) ? 1 : -1; else return 0; 21.2 重构后public final class SortMode implements Serializable private static final long serialVersionUID = 1L; private static final Map INSTANCES = new HashMap(); private final int type; private
4、final String name; private SortMode(int type, String name) this.type = type; this.name = name; public String toString() return name; public static final SortMode ASC = new SortMode(1, ASC); public static final SortMode DESC = new SortMode(2, DESC); static INSTANCES.put(ASC.name, ASC); INSTANCES.put(
5、DESC.name, DESC); public boolean isAsc() return ASC.type = this.type; public boolean isDesc() return DESC.type = this.type; private Object readResolve() return INSTANCES.get(name); public static SortMode parse(String name) return (SortMode) INSTANCES.get(name); public boolean equals(Object obj) if (
6、obj instanceof SortMode) SortMode that = (SortMode) obj; if (that.type = this.type) return true; return false; else return false; public class LabelComparator implements Comparator, Serializable private static final long serialVersionUID = 1L; public SortMode mode = SortMode.ASC; public LabelCompara
7、tor() public LabelComparator(SortMode mode) this.mode = mode; public int compare(Object o1, Object o2) if (o1 = null & o2 = null) return 0; if (o1 = null) return -1; if (o2 = null) return -1; if (Label) o1).getIndex() (Label) o2).getIndex() return mode.isAsc() ? 1 : -1; else return 0; 22 使用对象封装参数22.
8、1 重构前public int getRemainMinutes(int hour, int minute, int fromHour, int fromMinute int toHour, int toMinute) / -from-to-position- int startHour = toHour; int startMinute = toMinute; if (this.fromAfterEqual(hour, minute) / -position-from-to- startHour = fromHour; startMinute = fromMinute; else if (t
9、his.toAfterEqual(hour, minute) / -from-position-to- startHour = hour; startMinute = minute; return this.getMinutes(startHour, startMinute, toHour, toMinute);22.2 重构后public class DayPart implements Serializable int fromHour = -1; int fromMinute = -1; int toHour = -1; int toMinute = -1; public int get
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