map集合转化成list集合

最新推荐文章于 2023-08-25 14:57:53 发布

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本文介绍了一个使用Java实现的具体案例，展示了如何将包含员工信息的HashMap转换为ArrayList的过程。通过定义Emp类存储员工数据，并使用ToMap辅助类完成转换操作。

package emp;

public class Emp {
private String name;
private int age;
private int salar;
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 int getSalar() {
  return salar;
}
public void setSalar(int salar) {
  this.salar = salar;
}
public Emp() {
  super();
  // TODO Auto-generated constructor stub
}
public Emp(String name, int age, int salar) {
  super();
  this.name = name;
  this.age = age;
  this.salar = salar;
}
@Override
public String toString() {
  return "Emp [name=" + name + ", age=" + age + ", salar=" + salar + "]";
}

}

public class ToList {
private Object key;
private Object value;
public ToList() {
  super();
  // TODO Auto-generated constructor stub
}
public ToList(Object key, Object value) {
  super();
  this.key = key;
  this.value = value;
}
@Override
public String toString() {
  return "ToMap [key=" + key + ", value=" + value + "]";
}
public static ArrayList toList(HashMap<String,Emp> map){
  ArrayList alist=new ArrayList();
  Set set=map.keySet();
  Iterator<String> it = set.iterator();
  while(it.hasNext()){
   //Object key=it.next();
   String key=it.next();
   //Object value=map.get(key);
   Emp value=map.get(key);
   Object obj=new ToList(key,value);
   alist.add(obj);
  }
  return alist;
}
public static void main(String[] args) {
  HashMap<String,Emp> hm=new HashMap<String,Emp>();
  hm.put("a", new Emp("a",32,8000));
  hm.put("b", new Emp("b",46,6000));
  hm.put("c", new Emp("c",22,2000));
  hm.put("d", new Emp("d",51,9000));
  ArrayList alist=toList(hm);
  System.out.println(alist);
}