Polish

See gh-13148

spring-boot-project/spring-boot-tools/spring-boot-configuration-metadata/src/main/java/org/springframework/boot/configurationmetadata/SentenceExtractor.java

@@ -17,7 +17,9 @@
 package org.springframework.boot.configurationmetadata;
 
 import java.text.BreakIterator;
+import java.util.Arrays;
 import java.util.Locale;
+import java.util.stream.Collectors;
 
 /**
  * Utility to extract the first sentence of a text.
@@ -45,11 +47,7 @@ class SentenceExtractor {
 
 	private String removeSpaceBetweenLine(String text) {
 		String[] lines = text.split(System.lineSeparator());
-		StringBuilder sb = new StringBuilder();
-		for (String line : lines) {
-			sb.append(line.trim()).append(" ");
-		}
-		return sb.toString().trim();
+		return Arrays.stream(lines).map(String::trim).collect(Collectors.joining(" "));
 	}
 
 }

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/test/java/org/springframework/boot/loader/tools/ZipHeaderPeekInputStreamTests.java

@@ -42,7 +42,7 @@ public class ZipHeaderPeekInputStreamTests {
 	}
 
 	@Test
-	public void hasZipHeaderReturnsFalseWheStreamDoesNotStartWithZipHeader()
+	public void hasZipHeaderReturnsFalseWhenStreamDoesNotStartWithZipHeader()
 			throws IOException {
 		try (ZipHeaderPeekInputStream in = new ZipHeaderPeekInputStream(
 				new ByteArrayInputStream(new byte[] { 0, 1, 2, 3, 4, 5 }))) {

spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarFileTests.java

@@ -496,7 +496,7 @@ public class JarFileTests {
 					.openConnection().getInputStream().close();
 			this.thrown.expect(FileNotFoundException.class);
 			new URL(context, "jar:" + this.rootJarFile.toURI() + "!/no.dat")
-					.openConnection().getInputStream().close();
+					.openConnection().getInputStream();
 		}
 		finally {
 			JarURLConnection.setUseFastExceptions(false);