我有以下代码使用JSONArray来迭代import org.apache.log4j.Logger;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.stream.IntStream;
public class Pmt {
private String[] patchInformation_svnRevisionpublic;
private final Logger logger = Logger.getLogger(Pmt.class.getName());
private static final String COMMITS_IN_PATCH_IDENTIFIER = "patchInformation_svnRevisionpublic"; //key used to identify the commits in a patch from JSON response received from PMT
private static final String KEY_STRING = "name";
private static final String VALUE_STRING = "value";
public String[] getPublicGitCommitHashes(JSONArray jsonArray) {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = (JSONObject) jsonArray.get(i);
String tempName = (String) jsonObject.get(KEY_STRING);
if (tempName.equals(COMMITS_IN_PATCH_IDENTIFIER)) {
JSONArray tempCommitsJSONArray = (JSONArray) jsonObject.get(VALUE_STRING);
//initializing the patchInformation_svnRevisionpublic array
patchInformation_svnRevisionpublic = new String[tempCommitsJSONArray.length()];
// for ommiting the white spaces at the begingin and end of the commits
IntStream.range(0, tempCommitsJSONArray.length()).forEach(j -> patchInformation_svnRevisionpublic[j] = ((String) tempCommitsJSONArray.get(j)).trim());
logger.info(" The commits hashes obtained from WSO2 PMT are successfully saved to an array");
System.out.println("The commit Ids are");
// for printing all the commits ID associated with a patch
IntStream.range(0, patchInformation_svnRevisionpublic.length).mapToObj(i1 -> patchInformation_svnRevisionpublic[i1]).forEach(System.out::println);
System.out.println();
break;
}
}
//to prevent from internaal representation by returning referecnce to mutable object
String clonedPatchInformation_svnRevisionpublic[] = patchInformation_svnRevisionpublic.clone();
return clonedPatchInformation_svnRevisionpublic;
}
}
中的元素。
Java 8如何使用streams API中的新功能，例如forEach或public static void setTekst(String tekst){
konsol.setText(tekst);
}
来执行相同的任务。提前致谢
答案 0 :(得分：9)
这相当于Java 8流API中的代码或代码。不是100％相当，但你可以得到主要的想法。
private static final String COMMITS_IN_PATCH_IDENTIFIER = "patchInformation_svnRevisionpublic"; //key used to identify the commits in a patch from JSON response received from PMT
private static final String KEY_STRING = "name";
private static final String VALUE_STRING = "value";
public List<String> getCommitIds (JSONArray array) {
return arrayToStream(array)
.map(JSONObject.class::cast)
.filter(o -> o.get(KEY_STRING).equals(COMMITS_IN_PATCH_IDENTIFIER))
.findFirst()
.map(o -> (JSONArray) o.get(VALUE_STRING))
.map(Main::arrayToStream)
.map(commits ->
commits.map(Object::toString)
.map(String::trim)
.collect(Collectors.toList())
)
.orElseGet(Collections::emptyList);
}
@Nonnull
private static Stream<Object> arrayToStream(JSONArray array) {
return StreamSupport.stream(array.spliterator(), false);
}