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: