这个程序的System.out.println（）有问题吧？
public class Person {String firstname,lastname;Boolean sex;Integer age;public Person(String firstname,String lastname,Boolean sex,Integer age) { this.firstname = firstname; this.lastname = lastname; this.sex = sex; this.age = age;}public String getFirstName() { return firstname; } public String getLastName() { return lastname; } public Boolean getSex() { return sex; } public Integer getAge() { return age; }//为了输入方便，重写了toString()public String toString() { return firstname +" "+lastname+" "+(sex.booleanValue()?"男":"女")+" "+age; }}//end person下面是要实现比较器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)); } };}}以上代码有可能因为浏览器的布局自动换行。compare(Person o1, Person o2)的返回值看起来比较别扭。最简单的是 public int compare(Boolean o1, Boolean o2) { return (o1.equals(o2)? 0 : (o1.booleanValue()==true?1:-1)); }o1和o2相等返回0，否则o1如果是true 就表示o1大于o2。再尝试输出结果看看public class Main {public Main() {}public static void main(String[] args) { Person[] person = new Person[] { new Person("ouyang", "feng", Boolean.TRUE, new Integer(27)), new Person("zhuang", "gw", Boolean.TRUE, new Integer(27)), new Person("zhuang", "gw", Boolean.FALSE, new Integer(27)), new text.Person("zhuang", "gw", Boolean.FALSE, new Integer(2)), }; for (int i = 0; i < person.length; i++) { [color=#FF0000] System.out.println("before sort=" + person[i]);[/color] } java.util.Arrays.sort(person, Comparators.getComparator());for (int i = 0; i < person.length; i++) { System.out.println("after sort=" + person[i]);}}}输出结果：[color=#FF0000]before sort=ouyang feng 男 27[/color]before sort=zhuang gw 男 27before sort=zhuang gw 女 27before sort=zhuang gw 女 2after sort=ouyang feng 男 27after sort=zhuang gw 女 2after sort=zhuang gw 女 27after sort=zhuang gw 男 27