[Java]枚举类型：遍历为List

方式1

Demo

import com.google.common.collect.Lists;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public enum StandardOperationEntityType {
        CREATE("CODELIST", "数据字典"),
        DELETE("CODELIST_ITEM", "数据字典项");

        private final String code;
        private final String name;

        public final String CODE_PARAM = "code";
        public final String NAME_PARAM = "name";

    StandardOperationEntityType(String code, String name){
            this.code = code;
            this.name = name;
        }

        public static StandardOperationEntityType findByCode(String code) {
            for (StandardOperationEntityType type : values()) {
                if (type.getCode().equals(code)) {
                    return type;
                }
            }
            return null;
        }

        public static StandardOperationEntityType findByName(String name) {
            for (StandardOperationEntityType type : values()) {
                if (type.getName().equals(name)) {
                    return type;
                }
            }
            return null;
        }

        public String getCode() {
            return this.code;
        }

        public String getName() {
            return this.name;
        }

    public static List<Map<String, String>> toList() {
        List<Map<String, String>> list = Lists.newArrayList();//Lists.newArrayList()其实和new ArrayList()几乎一模
        for (StandardOperationEntityType item : StandardOperationEntityType.values()) {
            Map<String, String> map = new HashMap<String, String>();
            map.put(StandardOperationEntityType.CODE_PARAM, item.getCode());
            map.put(StandardOperationEntityType.NAME_PARAM, item.getName());
            list.add(map);
        }
        return list;
    }
}

方式2

StandardOperationEntityType [] array = StandardOperationEntityType.values();

List<StandardOperationEntityType> list = Arrays.asList(array);

Set<StandardOperationEntityType> set= new HashSet<>( list );
//Set<StandardOperationEntityType> set= new HashSet<>( Arrays.asList(StandardOperationEntityType.values()) );

X 参考文献

• Java循环遍历枚举类型