public enum Operation { Add("Add"), Upd("Upd"), Del("Del"); private String value; public String getValue() { return value; } private Operation(String value) { this.value = value; } public static Operation getInstanceByValue(String type) { Operation[] values = Operation.values(); for (Operation obj : values) { if (obj.getValue().equals(type)) { return obj; } } return null; } }
java 定义 枚举类 enum
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