文件名称：java对象比较器
文件大小：2KB
文件格式：TXT
更新时间：2015-03-15 15:01:19
java对象比较器
public class Comparators { public static java.util.Comparator getComparator() { return new java.util.Comparator() { public int compare(Object o1, Object o2) { if (o1 instanceof String) { return compare( (String) o1, (String) o2); } else if (o1 instanceof Integer) { return compare( (Integer) o1, (Integer) o2); } else if (o1 instanceof Person) { return compare( (Person) o1, (Person) o2); } else { System.err.println("未找到合适的比较器"); return 1; } } public int compare(String o1, String o2) { String s1 = (String) o1; String s2 = (String) o2; int len1 = s1.length(); int len2 = s2.length(); int n = Math.min(len1, len2); char v1[] = s1.toCharArray(); char v2[] = s2.toCharArray(); int pos = 0; while (n-- != 0) { char c1 = v1[pos]; char c2 = v2[pos]; if (c1 != c2) { return c1 - c2; } pos++; } return len1 - len2; } public int compare(Integer o1, Integer o2) { int val1 = o1.intValue(); int val2 = o2.intValue(); return (val1 < val2 ? -1 : (val1 == val2 ? 0 : 1)); } public int compare(Boolean o1, Boolean o2) { return (o1.equals(o2)? 0 : (o1.booleanValue()==true?1:-1)); } public int compare(Person o1, Person o2) { String firstname1 = o1.getFirstName(); String firstname2 = o2.getFirstName(); String lastname1 = o1.getLastName(); String lastname2 = o2.getLastName(); Boolean sex1 = o1.getSex(); Boolean sex2 = o2.getSex(); Integer age1 = o1.getAge(); Integer age2 = o2.getAge(); return (compare(firstname1, firstname2) == 0 ? (compare(lastname1, lastname2) == 0 ? (compare(sex1, sex2) == 0 ? (compare(age1, age2) == 0 ? 0 : compare(age1, age2)) : compare(sex1, sex2)) : compare(lastname1, lastname2)) : compare(firstname1, firstname2)); } }; } }