创建Map集合，创建Emp对象，并将创建的Emp对象添加到集合中，并将id为005的对象从集合中移除
创建Emp类：
package jihe;
public class Emp {
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
private String name;
public Emp(String id, String name) {
super();
this.id = id;
this.name = name;
}
创建Map类并测试：
package jihe;
import java.util.*;
public class lianxi1 {
public static void main(String[] args) {
Map<String,String> map=new HashMap<>();
Emp emp=new Emp("001","汉堡");
Emp emp1=new Emp("002","薯条");
Emp emp2=new Emp("003","咖啡");
Emp emp3=new Emp("004","牛奶");
Emp emp4=new Emp("005","鸡翅");
Emp emp5=new Emp("006","鸡腿");
map.put(emp.getId(), emp.getName());
map.put(emp1.getId(), emp1.getName());
map.put(emp2.getId(), emp2.getName());
map.put(emp3.getId(), emp3.getName());
map.put(emp4.getId(), emp4.getName());
map.put(emp5.getId(), emp5.getName());
map.remove(emp4.getId());
Set <String> k=map.keySet();
Iterator<String> it=k.iterator();
while(it.hasNext())
{
String str=it.next();
System.out.println(str+" "+map.get(str));
}
}
}
测试结果：
