枚举相关

Posted on | In

传入code找value值

第一种：name-value

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/**
 * driver-class-name
 */
public enum JdbcDriverTypeEnum {
    /**
     * mysql
     */
    MYSQL("MYSQL","com.mysql.cj.jdbc.Driver");

    private String name;

    private String value;

    JdbcDriverTypeEnum(String name, String value) {
        this.name = name;
        this.value = value;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public static String getDriverType(String name) {
        for (JdbcDriverTypeEnum type : JdbcDriverTypeEnum.values()) {
            if (name.equals(type.getName())) {
                return type.value;
            }
        }
        return null;
    }
}

自己的实例

在枚举类中添加获取枚举对象的方法（注意：values()就是所有枚举对象数组）

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package com.xm597.common.constants;

/**
 * 说明：
 *
 * @author lyk
 * time 2021/7/12 10:54
 */
public enum ApiErrorCodeEnum {
	API_ERROR_CODE_1000(-1000, "请重新下载最新版本！"),
	API_ERROR_CODE_1005(-1005, "公司营业执照审核未通过！"),
	API_ERROR_CODE_1006(-1006, "请完善公司基础信息！");

	private final int code;
	private final String msg;

	ApiErrorCodeEnum(int code, String msg) {
		this.code = code;
		this.msg = msg;
	}

	public static ApiErrorCodeEnum getInstance(int code){
		for (ApiErrorCodeEnum value : values()) {
			if (code == value.getCode()){
				return value;
			}
		}
		return null;
	}

	public int getCode() {
		return code;
	}

	public String getMsg() {
		return msg;
	}
}

调用

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public String getJustTipsMsg(int apiErrorCode){
    if (ApiErrorCodeEnum.getInstance(apiErrorCode) != null){
        return ApiErrorCodeEnum.getInstance(apiErrorCode).getMsg();
    }
    return "";
}

第二种：value

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public enum JdbcDriverTypeEnum {
    /**
     * mysql
     */
    MYSQL("com.mysql.cj.jdbc.Driver"),
    ORACLE("oracle.jdbc.driver.OracleDriver");

    private String value;

    JdbcDriverTypeEnum(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public static String getDriverType(String name) {
        for (JdbcDriverTypeEnum enumValue : values()) {
            if (StringUtils.equals(name, enumValue.name())) {
                return enumValue.value;
            }
        }
        return null;
    }
}

枚举内容可以同时放不同的基本类型数据

这种情况虽然暂时没有用到

比如

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public enum TypeEnum{
    MYSQL("hello"), ORACLE(123);
    
    private String name;
    private int index;
    private Context context;
    
    TypeEnum(String name){
        this.name  = name;
    }
    
    TypeEnum(int index){
        this.index = index;
    }
    
    public String getName(){
        return this.name;
    }
    
    public int getIndex(){
        return this.index;
    }
    
    public void setContext(Context context){
        this.context = context;
    }
    
    public Context getContext(){
        return this.context;
    }
}

使用

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public class MainActivity extends AppCompatActivity{
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        
        TypeEnum type1 = TypeEnum.MYSQL.setContext(this);
        TypeEnum type2 = TypeEnum.ORACLE.setContext(this);
        //上面这俩取到的Context是同一个对象，type1.getContext()===type2.getContext()
        
        System.out.println(type1.getName());//h
        System.out.println(type2.getIndex());//123
    }
}