- <div class="blockcode"><blockquote>import java.util.*;
- class Student implements Comparable<Student>{
- private String name;
- private int age;
- Student(String name, int age){
- this.name = name;
- this.age = age;
- }
- public int CompareTo(Student s){
- int num = new Integer(this.age).compareTo(new Integer(s.age));
- if(num == 0)
- return this.name.compareTo(s.name);
- return num;
- }
-
- public int hashCode(){
- return name.hashCode()+age*34;
- }
- public boolean equals(Object obj){
- if(!(obj instanceof Student))
- throw new ClassCastException("类型不匹配");
- Student s = (Student)obj;
- return this.name.equals(s.name) &&this.age == s.age;
- }
-
- public String getName(){
- return name;
- }
- public int getAge(){
- return age;
- }
- public String toString(){
- return name+":"+age;
- }
- @Override
- public int compareTo(Student o) {
- // TODO Auto-generated method stub
- return 0;
- }
- }
- public class MapTest{
- public static void main(String[] args){
- HashMap<Student,String> hm = new HashMap<Student,String>();
-
- hm.put(new Student("lisi",21),"beijing");
- hm.put(new Student("lisi",21),"tianjin");
- hm.put(new Student("lisi2",22),"shanghai");
- hm.put(new Student("lisi3",23),"nanjing");
- hm.put(new Student("lisi4",24),"shenyang");
-
- //第一种取出方式 keySet
-
- Set<Student> keySet = hm.keySet();
- Iterator<Student> it = keySet.iterator();
-
- while(it.hasNext()){
- Student stu = it.next();
- String addr = hm.get(stu);
- System.out.println(stu+".."+addr);
- }
-
- //第二种取出方式 entrySet
- Set<Map.Entry<Student,String>> entrySet = hm.entrySet();
- Iterator<Map.Entry<Student,String>> iter = entrySet.iterator();
-
- while(it.hasNext()){
- Map.Entry<Student,String> me = iter.next();
- Student stu = me.getKey();
- String addr = me.getValue();
- System.out.println(stu+"....."+addr);
- }
- }
- }
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