Operating system environment variables

In Java, many classes areIterable, Mainly including allCollectionCategory (but not variousMaps). For example, the following code can display all operating system environment variables:

// collections/EnvironmentVariables.java
// {VisuallyInspectOutput}
import java.util.*;

public class EnvironmentVariables {
  public static void main(String[] args) {
    for(Map.Entry entry: System.getenv().entrySet()) {
      System.out.println(entry.getKey() + ": " +
        entry.getValue());
    }
  }
}

PATH: /Library/Frameworks/Python.framework/Versions/3.8/bin:/Users/chy/Library/apache-maven-3.6.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/chy/Library/tomcat9.27/bin
SHELL: /bin/bash
USER: wangyixuan
TMPDIR: /var/folders/_t/s_5zr51n5kv_qc8rkjn_d84h0000gn/T/
SSH_AUTH_SOCK: /private/tmp/com.apple.launchd.V3hV7RDf03/Listeners
XPC_FLAGS: 0x0
VERSIONER_PYTHON_VERSION: 2.7
__CF_USER_TEXT_ENCODING: 0x1F5:0x19:0x34
LOGNAME: wangyixuan
LC_CTYPE: zh_CN.UTF-8
M3_HOME: /Users/chy/Library/apache-maven-3.6.3
PWD: /Users/chy/Documents/JavaProject/Java8
XPC_SERVICE_NAME: com.jetbrains.intellij.1576
JAVA_MAIN_CLASS_16255: EnvironmentVariables
HOME: /Users/chy

System.getenv()Return oneMap ， entrySet()Generate a causeMap.EntryComposed of the elementsSet, And thisSet Is an IterableSo it can be usedfor-inCirculation.for-inThe statement is applicable to arrays or any otherIterableBut this does not mean that the array must also be aIterable, There will be no automatic packing

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