ラベルの付いた使用法break文Javaの基礎-breakラベル。

- それを記録 - 何を見ていない書き込みのJavaがあった場合には、今日のクライアントにRocketMQを確認することです。
また、ラベル付きブレークであり、
RocketMQクライアントの使用

while(true) {
                label122: {
                               switch(communicationMode) {
                                case ASYNC:
                                    return null;
                                case ONEWAY:
                                    return null;
                                case SYNC:
                                    if () {
                                        return sendResult;
                                    }
                                default:
                                    break label122;
                                }
                          }
           }

実際には、それが理解しやすいです：マークは、コードのブロックがデフォルトで実行されるコードブロックを破るlabel122時間があるときに実行されます。
どのようにそれを使用するには？

package io.ilss.rocketmq.demo;

/**
 * className Main
 * description Main
 *
 * @author feng
 * @version 1.0
 * @date 2019-03-10 13:45
 */
public class Main {
    public static void main(String[] args) {
        label1:
        for (int i = 0; i < 10; i++) {
            label2:
            if (i > 0) {
                if (i > 8) {
                    break label1;
                }
                System.out.print(i + " ");
                if (i > 3) {
                    break label2;
                }
                System.out.print(" if end ");

            }

            label3: {
                if (i > 5) {
                    break label3;
                }
                System.out.print(", label3 block");
            }
            System.out.println(", for end ");
        }
    }
}

以下が出力されます。

/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/bin/java "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=52397:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/tools.jar:/Users/feng/Projects/idea/springboot-rocketmq-ilss/target/classes:/Users/feng/Developer/mvn-repository/org/springframework/boot/spring-boot-starter/2.1.3.RELEASE/spring-boot-starter-2.1.3.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/springframework/boot/spring-boot/2.1.3.RELEASE/spring-boot-2.1.3.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/springframework/spring-context/5.1.5.RELEASE/spring-context-5.1.5.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/springframework/spring-aop/5.1.5.RELEASE/spring-aop-5.1.5.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/springframework/spring-beans/5.1.5.RELEASE/spring-beans-5.1.5.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/springframework/spring-expression/5.1.5.RELEASE/spring-expression-5.1.5.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/springframework/boot/spring-boot-autoconfigure/2.1.3.RELEASE/spring-boot-autoconfigure-2.1.3.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/springframework/boot/spring-boot-starter-logging/2.1.3.RELEASE/spring-boot-starter-logging-2.1.3.RELEASE.jar:/Users/feng/Developer/mvn-repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar:/Users/feng/Developer/mvn-repository/ch/qos/logback/logback-core/1.2.3/logback-core-1.2.3.jar:/Users/feng/Developer/mvn-repository/org/apache/logging/log4j/log4j-to-slf4j/2.11.2/log4j-to-slf4j-2.11.2.jar:/Users/feng/Developer/mvn-repository/org/apache/logging/log4j/log4j-api/2.11.2/log4j-api-2.11.2.jar:/Users/feng/Developer/mvn-repository/org/slf4j/jul-to-slf4j/1.7.25/jul-to-slf4j-1.7.25.jar:/Users/feng/Developer/mvn-repository/javax/annotation/javax.annotation-api/1.3.2/javax.annotation-api-1.3.2.jar:/Users/feng/Developer/mvn-repository/org/springframework/spring-core/5.1.5.RELEASE/spring-core-5.1.5.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/springframework/spring-jcl/5.1.5.RELEASE/spring-jcl-5.1.5.RELEASE.jar:/Users/feng/Developer/mvn-repository/org/yaml/snakeyaml/1.23/snakeyaml-1.23.jar:/Users/feng/Developer/mvn-repository/org/slf4j/slf4j-api/1.7.25/slf4j-api-1.7.25.jar:/Users/feng/Developer/mvn-repository/org/apache/rocketmq/rocketmq-client/4.4.0/rocketmq-client-4.4.0.jar:/Users/feng/Developer/mvn-repository/org/apache/rocketmq/rocketmq-common/4.4.0/rocketmq-common-4.4.0.jar:/Users/feng/Developer/mvn-repository/org/apache/rocketmq/rocketmq-remoting/4.4.0/rocketmq-remoting-4.4.0.jar:/Users/feng/Developer/mvn-repository/com/alibaba/fastjson/1.2.51/fastjson-1.2.51.jar:/Users/feng/Developer/mvn-repository/io/netty/netty-all/4.1.33.Final/netty-all-4.1.33.Final.jar:/Users/feng/Developer/mvn-repository/org/apache/rocketmq/rocketmq-logging/4.4.0/rocketmq-logging-4.4.0.jar:/Users/feng/Developer/mvn-repository/io/netty/netty-tcnative-boringssl-static/2.0.20.Final/netty-tcnative-boringssl-static-2.0.20.Final.jar:/Users/feng/Developer/mvn-repository/org/apache/commons/commons-lang3/3.8.1/commons-lang3-3.8.1.jar io.ilss.rocketmq.demo.Main
, label3 block, for end 
1  if end , label3 block, for end 
2  if end , label3 block, for end 
3  if end , label3 block, for end 
4 , label3 block, for end 
5 , label3 block, for end 
6 , for end 
7 , for end 
8 , for end 

Process finished with exit code 0

簡単には、これは実際には条件が与えられたラベルをブロックするようにジャンプしていることを確認します。実行されません。そして、類似した別のブレーク事実、ラベルを使用すると、定義されたコードブロックを破るために適用されると、循環中に一人で休憩を演技。しかし、一つのことは、位置BREAKラベルは、ラベルのコードブロック内でなければなりません。それ以外の場合は、無効な構文エラー。

だから、少し。

苡仁ilssio

公開された34元の記事・ウォン称賛7 ・ビュー8173

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ラベルの付いた使用法break文Javaの基礎-breakラベル。

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