java Hashmap录入输出对象信息

痛定思痛。 2023-02-13 14:49 27阅读 0赞

创建一个Hashmap对象，并且在其中添加一些员工的姓名和工资：张三，800，李四，6000.然后从Hashmap对象中获取这两个人的薪水并打印出来，接着把张三的工资改为8500，再把他们的薪水显示出来。  
**包关系展示**  
![在这里插入图片描述][20200529175852396.png]  
**测试类代码**

package Hashmap;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Map.Entry;
    import java.util.Scanner;
    import java.util.Set;
    public class hashmap {
        
    
        public static void main(String[] args) {
        
    //	     定义HashMap对象map1,key和value的数据类型都是String.
    	Map<String,String> map1= new HashMap<String,String>();
            map1.put("姓名", "工资");  
            People s1 = new People();
    	while (true){
        
    		System.out.println("-----------欢迎进入工资信息系统-----------");
    //		Show( map1.size(),map1);
    		System.out.println("请选择你想操作的功能");
    		System.out.println("0.展示现存人员信息人");
    		System.out.println("1.添加人员资料");
    		System.out.println("2.删除信息");
    		System.out.println("3.修改信息");
    		System.out.println("4.走出仓库");
    		Scanner sc = new Scanner(System.in);
    		String line = sc.nextLine();
    		//利用switch语句调用展示方法和进行功能操作的switch语句
    		switch (line) {
        
    		case "0":{
        
    		    	Show(map1);
    			break;
    		}
    		case "1":{
        
    
    			System.out.print("请输入你要录入的人员姓名：");
    			String name = sc.nextLine();
    			s1.setName(name);
    			System.out.print("请输入你要录入的人员工资：");
    			String count = sc.nextLine();
    			s1.setcount(count);
    			map1.put(s1.getName(), s1.getcount());
    			System.out.println("恭喜录入成功！");
    			break;
    		}
    		case "2":{
          
    		    	Show(map1);
    		    	System.out.println("请选择你要删除的人员姓名");
    		    	String rename = sc.nextLine();
    		    	map1.remove(rename);
    		    	System.out.println("恭喜删除成功！");
    			break;
    		}
    		case "3":{
        
    		    	Show(map1);
    			System.out.print("请输入你要修改人的名字：");
    			String name = sc.nextLine();
    			s1.setName(name);
    			map1.remove(name);
    			System.out.print("请重新输入你要录入的人员工资：");
    			String count = sc.nextLine();
    			s1.setcount(count);
    			map1.put(s1.getName(), s1.getcount());
    			System.out.println("恭喜修改成功！");
    			break;
    		}
    		case "4":{
        
    			//直接结束系统运行
    			System.out.println("已退出仓库");
    			System.exit(0);
    		}
    		default:
    			System.out.println("您输入的信息有误，请重新输入");
    			break;
    		}
    	}
     
    	    }
       
        public static void Show(Map<String, String> map1){
        
    		Set<Entry<String, String>> m=map1.entrySet();
    		java.util.Iterator<Entry<String, String>> iter =m.iterator() ;
    		while(iter.hasNext()){
        
    			Entry<String,String> e=iter.next();
    			System.out.println(e.getKey()+"  "+e.getValue());
    		
    
    	    }
    
    	    
    	}
        }

**对象类代码**

package Hashmap;
    
    
    
    public class People {
        
        private String name;
        private String count;
        public void People(String name, String count) {
        
            this.name = name;
            this.count = count;
        }
        public String getName() {
        
            return name;
        }
        public void setName(String name) {
        
            this.name = name;
        }
        public String getcount() {
        
            return count;
        }
        public void setcount(String count) {
        
            this.count = count;
        }
    
    
    
    }

运行结果展示  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5neXVud2VpX0Jsb2c_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5neXVud2VpX0Jsb2c_size_16_color_FFFFFF_t_70 1]

[20200529175852396.png]: https://img-blog.csdnimg.cn/20200529175852396.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5neXVud2VpX0Jsb2c_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200529180028105.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5neXVud2VpX0Jsb2c=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5neXVud2VpX0Jsb2c_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200529180045552.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5neXVud2VpX0Jsb2c=,size_16,color_FFFFFF,t_70