表格数据存储-ListMap存储并四种方式遍历打印

￡神魔★判官ぃ 2021-09-29 15:22 374阅读 0赞

将表格内容放到多个Map中，再将这几个Map放到List中

package 泛型.表格数据储存;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.List;
    import java.util.Map;
    import java.util.Map.Entry;
    import java.util.Set;
    
    public  class tableStoredata {
    	public static void main(String[] args) {
    		Map<String, Object> map=new HashMap<String, Object>();
    		map.put("id",1001);
    		map.put("姓名","张涛1");
    		map.put("年龄",18);
    		map.put("薪水",50000);
    		Map<String, Object> map1=new HashMap<String, Object>();
    		map1.put("id",1001);
    		map1.put("姓名","张涛2");
    		map1.put("年龄",18);
    		map1.put("薪水",50000);
    		Map<String, Object> map2=new HashMap<String, Object>();
    		map2.put("id",1001);
    		map2.put("姓名","张涛3");
    		map2.put("年龄",18);
    		map2.put("薪水",50000);
    		Map<String, Object> map3=new HashMap<String, Object>();
    		map3.put("id",1001);
    		map3.put("姓名","张涛4");
    		map3.put("年龄",18);
    		map3.put("薪水",50000);
    		
    		List<Map<String , Object>> tableList=new ArrayList<Map<String,Object>>();
    		tableList.add(map);
    		tableList.add(map1);
    		tableList.add(map2);
    		tableList.add(map3);
    		//第一种
    //		for(Map<String , Object> m:tableList) {
    //			System.out.println(m);
    //		}
    		//第二种
    		//先对list遍历后对map遍历
    //		for(Map<String , Object> m:tableList) {
    //			Set<String> keySet=map.keySet();//获取key值
    //			for(String key:keySet) {
    //				
    //			System.out.print(key+"--"+m.get(key)+"\t");
    //		}
    //			System.out.println();
    //	}
    		
    		
    
    
    		//第三种
    		for(Map<String ,Object> m:tableList) {
    			Set<String > keySet=map.keySet();//获取key
    			for(Iterator<String > iter =keySet.iterator();iter.hasNext();) {
    				String keyString=iter.next();
    //				System.out.print(keyString+"--"+map.get(keyString)+"\t");
    			}
    //			System.out.println();
    		}
    
    
    	//第四种
    	for(Map<String ,Object> m:tableList) {
    		Set<Entry<String,Object>> set=map.entrySet();//获取键值对
    		for(Iterator<Entry<String, Object>> iter =set.iterator();iter.hasNext();) {
    			Entry<String ,Object> tempEntry=iter.next();
    			System.out.print(tempEntry.getKey()+"--"+tempEntry.getValue()+"\t");
    		}
    			System.out.println();
    	}
    	}
    	
    }