[Java] 纯文本查看 复制代码
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
//HashMap存储键是String值是自定义对象
//每位学生（姓名，年龄）都有自己的家庭住址。
//那么，既然有对应关系，则将学生对象和家庭住址存储到Map集合中。
//家庭住址作为键, 学生作为值。并使用keySet和entrySet方式遍历Map集合
public class Test06 {
public static void main(String[] args) {
HashMap<String, Student> map = new HashMap<String, Student>();
// 将学生对象和家庭住址存储到Map集合中。
map.put("北京", new Student("张三", 18));
map.put("上海", new Student("李四", 19));
map.put("广州", new Student("王五", 20));
map.put("深圳", new Student("赵六", 21));
// 使用keySet和entrySet方式遍历Map集合
for (String key : map.keySet()) {
System.out.println(key + "=" + map.get(key).toString());
}
System.out.println("==============");
Set<Map.Entry<String, Student>> set2 = map.entrySet();
for (Map.Entry<String, Student> entry : set2) {
System.out.println(entry.getKey() + "=" + entry.getValue().toString());
}
}
}
public class Student {
private String name;
private int age;
public Student() {
super();
}
public Student(String name, int age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String toString() {
return ("["+name+" , "+age+"]");
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Student other = (Student) obj;
if (age != other.age)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
}