HashSet 集合存储自定义对象并遍历

冷不防 2022-05-29 04:55 166阅读 0赞

package exercise;  
  
  
import java.util.HashSet;  
/\*  
 \* HashSet 集合存储自定义对象并遍历，如果对象的成员遍历值相同即为同一个对象。  
 \* 它的底层是哈希表结构，而哈希表底层依赖的是hashCode（）和equals（）方法来保证其唯一性\*/

//可以单独写一个具体类H，为了能看清楚写在了同一个页面中。

class H \{

private String name;  
private int age;  
private char sex;  
  
  
public H() \{  
super();  
  
  
\}  
  
  
public H(String name, int age, char sex) \{  
super();  
this.age = age;  
this.name = name;  
this.sex = sex;  
\}  
  
  
@Override  
public int hashCode() \{  
final int prime = 31;  
int result = 1;  
result = prime \* result + age;  
result = prime \* result + ((name == null) ? 0 : name.hashCode());  
result = prime \* result + sex;  
return result;  
\}  
  
  
@Override  
public boolean equals(Object obj) \{  
if (this == obj)  
return true;  
if (obj == null)  
return false;  
if (getClass() != obj.getClass())  
return false;  
H other = (H) obj;  
if (age != other.age)  
return false;  
if (name == null) \{  
if (other.name != null)  
return false;  
\} else if (!name.equals(other.name))  
return false;  
if (sex != other.sex)  
return false;  
return true;  
\}  
  
  
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 char getSex() \{  
return sex;  
\}  
  
  
public void setSex(char sex) \{  
this.sex = sex;  
\}  
  
  
\}  
  
  
  
  
public class HistoryDemo \{  
public static void main(String\[\] args) \{  
HashSet<H> hs = new HashSet<H>();  
  
  
// 创建历史任务对象  
H h1 = new H("秦桧", 25, '男');  
H h2 = new H("秦桧", 25, '男');  
H h3 = new H("秦桧", 23, '男');  
H h4 = new H("秦琼", 25, '男');  
H h5 = new H("高俅", 25, '女');  
H h6 = new H("高俅", 25, '男');  
H h7 = new H("秦桧", 25, '男');  
  
  
hs.add(h1);  
hs.add(h2);  
hs.add(h3);  
hs.add(h4);  
hs.add(h5);  
hs.add(h6);  
hs.add(h7);  
  
  
// 遍历  
for (H h : hs) \{  
System.out.println(h.getAge() + "----" + h.getName() + "------" + h.getSex());  
\}  
  
  
\}

运行：

![Image 1][]

[Image 1]: