Simplify code by using for-each loop

See gh-15563

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/session/SessionAutoConfiguration.java

@@ -164,9 +164,9 @@ public class SessionAutoConfiguration {
 		protected final String[] selectImports(WebApplicationType webApplicationType) {
 			List<String> imports = new ArrayList<>();
 			StoreType[] types = StoreType.values();
-			for (int i = 0; i < types.length; i++) {
+			for (StoreType type : types) {
 				imports.add(SessionStoreMappings.getConfigurationClass(webApplicationType,
-						types[i]));
+						type));
 			}
 			return StringUtils.toStringArray(imports);
 		}

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/json-shade/java/org/springframework/boot/configurationprocessor/json/JSONArray.java

@@ -65,8 +65,8 @@ public class JSONArray {
 	public JSONArray(Collection copyFrom) {
 		this();
 		if (copyFrom != null) {
-			for (Iterator it = copyFrom.iterator(); it.hasNext();) {
-				put(JSONObject.wrap(it.next()));
+			for (Object value : copyFrom) {
+				put(JSONObject.wrap(value));
 			}
 		}
 	}

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/Repackager.java

@@ -270,8 +270,8 @@ public class Repackager {
 	}
 
 	private boolean isZip(InputStream inputStream) throws IOException {
-		for (int i = 0; i < ZIP_FILE_HEADER.length; i++) {
-			if (inputStream.read() != ZIP_FILE_HEADER[i]) {
+		for (byte magicByte : ZIP_FILE_HEADER) {
+			if (inputStream.read() != magicByte) {
 				return false;
 			}
 		}