Java lombok 好用annotation小筆記

建構子設定

@AllArgsConstructor(access = AccessLevel.PUBLIC)

• AccessLevel --> 用來設定建構子的可視的等級 public private …

• EX

@Data
@AllArgsConstructor(access = AccessLevel.PUBLIC)
public class RegisteredFlow {

	private int flow;
	private List<RunInfo> runInfos;

	@Data
	@AllArgsConstructor(access = AccessLevel.PUBLIC)
	public static class RunInfo {
		private String runUid;
		private State state;
		private String endTag;
		private String endLinkUid;
	}
	
	public static void main(String[] args){
	    List<RunInfo> l = new List<RunInfo>();
	    RegisteredFlow rf = new RegisteredFlow(123,l);
	}
}

如果還要包含 空建構子, 可以再加入 @NoArgsConstructor

@Data
@AllArgsConstructor(access = AccessLevel.PUBLIC)
@NoArgsConstructor
public class RegisteredFlow {

builder pattern

關鍵字 :  @Builder 

範例:

	@Data
	@Builder
	public class Bundle {
		private String runFlowUid;
		private String flowUid;
		private FlowRuner flowRuner;

        public static void main(String[] args){
            Bundle ans = BoxRuner.Bundle.builder().flowUid(model.getUid()).runFlowUid(uid).flowRuner(this).build();
        }

	}

@Data 設定某些欄位 geter seter 不要出現

• 關鍵字 :

@Getter(value = AccessLevel.NONE)
@Setter(value = AccessLevel.NONE)

• ex:

	@Data
	public class Bundle {
		private String runFlowUid;
		private String flowUid;
		@Getter(value = AccessLevel.NONE)
        @Setter(value = AccessLevel.NONE)
		private FlowRuner flowRuner;
	}

屬性自動產生geter 或 seter

關鍵字

@Getter
@Setter

• ex:

	
	public class Bundle {
		private String runFlowUid;
		@Getter
        @Setter
		private String flowUid;
	}

這樣不需要@Data 就可以對某個屬信產生 geter 或 seter

自動產生 Slf4j logger

關鍵字

@Slf4j

• ex:

	
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class NodejsActionCall  {
	private void runCmd(Consumer<String> c, String... cmd) {
		log.info("runCmd:" + cmd);
		...
	}

}

持續更新…

md