集合多个map存储

最新推荐文章于 2024-08-16 17:35:37 发布

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最新推荐文章于 2024-08-16 17:35:37 发布

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分类专栏： Java 后端开发

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   1. 集合存储多个map，如下示例，会存储相同的对象
          public static void main(String[] args) {
          List<Map<String, Object>> offerProdInstRels=new ArrayList<Map<String, Object>>();
          Map<String, Object> relMap = new HashMap<String, Object>();
          Map<String, Object> relMap2 = new HashMap<String, Object>();
          Map<String, Object> relMap3 = new HashMap<String, Object>();
          Map<String, Object> relMap4 = new HashMap<String, Object>();
          relMap.put("offerProdInstRelId", "655361");
          relMap2.put("offerProdInstRelId", "655362");
          relMap3.put("offerProdInstRelId", "655363");
          relMap4.put("offerProdInstRelId", "655364");
          offerProdInstRels.add(relMap);
          offerProdInstRels.add(relMap2);
          offerProdInstRels.add(relMap3);
          offerProdInstRels.add(relMap4);
          Map<String, Object> offerProdInstRelMap = new HashMap<String, Object>();
          List<Object> offerProdInstRelList = new ArrayList<Object>();
          for(Map<String, Object> offerProdInstRel:offerProdInstRels){
               offerProdInstRelMap.clear();
               offerProdInstRelMap.put("statusCd", "1100");
               offerProdInstRelMap.put("actType", "MOD");
               offerProdInstRelMap.put("offerProdInstRelId", offerProdInstRel.get("offerProdInstRelId"));
               offerProdInstRelList.add(offerProdInstRelMap);
      	 } 
          System.out.println(offerProdInstRelList);
         }
        
 2. 解决方法：将map创建的对象放在里面
         List<Object> offerProdInstRelList = new ArrayList<Object>();
            for(Map<String, Object> offerProdInstRel:offerProdInstRels){
    	        Map<String, Object> offerProdInstRelMap = new HashMap<String, Object>();
    	        offerProdInstRelMap.put("statusCd", "1100");
    	        offerProdInstRelMap.put("actType", "MOD");
    	        offerProdInstRelMap.put("offerProdInstRelId", offerProdInstRel.get	 	("offerProdInstRelId"));
    	        offerProdInstRelList.add(offerProdInstRelMap);
    	 } 
            System.out.println(offerProdInstRelList);