JAVA 集合

最新推荐文章于 2025-08-15 22:56:20 发布

原创最新推荐文章于 2025-08-15 22:56:20 发布 · 190 阅读

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CC 4.0 BY-SA版权

文章标签：

#java #string #hashmap #class #c

本文通过一个具体的Java程序示例，详细介绍了如何使用Java集合框架中的ArrayList、LinkedList、HashSet及HashMap来存储和操作对象。示例中创建了一个Student类，并演示了不同集合类型的特点及其在实际应用中的使用方式。

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public class Student {//学生类
private String name;
private int age;
public Student(){}//空构造函数
public Student(String name,int age){//构造函数
  this.age=age;
  this.name=name;
}

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;
}

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import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;

public class Test {
public static void main(String[] args) {
  Student zhao=new Student("zhao",18);
  Student qian=new Student("qian",13);
  Student shun=new Student("shun",15);
  Student li=new Student("li",16);

  System.out.println("ArrayList/n");
  ArrayList<Student> a=new ArrayList<Student>();
  a.add(zhao);
  a.add(qian);
  a.add(shun);
  a.add(li);
  for (Student student : a) {
   System.out.println(student);
  }

  System.out.println("/nLinkedList/n");
  LinkedList<Student> b=new LinkedList<Student>();
  b.add(zhao);
  b.add(qian);
  b.add(shun);
  b.add(li);
  for (Student student : b) {
   System.out.println(student);
  }

  System.out.println("/nHashSet/n");

  HashSet<Student> c=new HashSet<Student>();
  c.add(zhao);
  c.add(qian);
  c.add(shun);
  c.add(li);


  for (Student student : c) {
   System.out.println(student);
  }


  System.out.println("/nHashMap/n");
  HashMap<String, Student> d=new HashMap();
  d.put(zhao.getName(), zhao);
  d.put(qian.getName(),qian);
  d.put(shun.getName(), shun);
  d.put(li.getName(), li);
  for (Student student : c) {
   System.out.println(student);
  }


}

}