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¡¡¡¡Comparable ½Ó¿ÚÖÐÖ»ÌṩÁËÒ»¸ö·½·¨£º compareTo(Object obj) £¬¸Ã·½·¨µÄ·µ»ØÖµÊÇ int ¡£Èç¹û·µ»ØÖµÎªÕýÊý£¬Ôò±íʾµ±Ç°¶ÔÏó(µ÷Óø÷½·¨µÄ¶ÔÏó)±È obj ¶ÔÏó“´ó”£»·´Ö®“С”£»Èç¹ûΪÁãµÄ»°£¬Ôò±íʾÁ½¶ÔÏóÏàµÈ¡£ÏÂÃæÊÇÒ»¸öʵÏÖÁË Comparable ½Ó¿ÚµÄ Student Àࣺ
public class Student implements Comparable {
private int id;
private String name;
public Student() {
super();
}
@Override
public int compareTo(Object obj) {
if (obj instanceof Student) {
Student stu = (Student) obj;
return id - stu.id;
}
return 0;
}
@Override
public String toString() {
return "<" + id + ", " + name + ">";
}
}
¡¡¡¡Student ʵÏÖÁË×ÔÈ»ÅÅÐò½Ó¿Ú Comparable £¬ÄÇôÎÒÃÇÊÇÔõôÀûÓÃÕâ¸ö½Ó¿Ú¶ÔÒ»×é Student ¶ÔÏó½øÐÐÅÅÐòµÄÄØ£¿ÎÒÃÇÔÚѧϰÊý×éµÄʱºò£¬Ê¹ÓÃÁËÒ»¸öÀàÀ´¸øÕûÐÍÊý×éÅÅÐò£º java.util.Arrays ¡£ÎÒÃÇʹÓà Arrays µÄ sort ·½·¨À´¸øÕûÐÍÊý×éÅÅÐò¡£·· API Îĵµ¾Í»á·¢ÏÖ£¬ Arrays Àï¸ø³öÁË sort ·½·¨ºÜ¶àÖØÔØÐÎʽ£¬ÆäÖоͰüÀ¨ sort(Object[] obj) £¬Ò²¾ÍÊÇ˵ Arryas Ò²ÄܶԶÔÏóÊý×é½øÐÐÅÅÐò£¬ÅÅÐò¹ý³ÌÖбȽÏÁ½¸ö¶ÔÏó“´óС”ʱʹÓõľÍÊÇ Comparable ½Ó¿ÚµÄ compareTo ·½·¨¡£
public class CompareTest {
public static void main(String[] args) {
Student stu1 = new Student(1, "Little");
Student stu2 = new Student(2, "Cyntin");
Student stu3 = new Student(3, "Tony");
Student stu4 = new Student(4, "Gemini");
Student[] stus = new Student[4];
stus[0] = stu1;
stus[1] =
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