Simplify utility implementations in spring-core

Closes gh-33903

spring-core/src/main/java/org/springframework/util/FastByteArrayOutputStream.java

@@ -98,13 +98,11 @@ public class FastByteArrayOutputStream extends OutputStream {
 		if (this.closed) {
 			throw new IOException("Stream closed");
 		}
-		else {
-			if (this.buffers.peekLast() == null || this.buffers.getLast().length == this.index) {
-				addBuffer(1);
-			}
-			// store the byte
-			this.buffers.getLast()[this.index++] = (byte) datum;
+		if (this.buffers.peekLast() == null || this.buffers.getLast().length == this.index) {
+			addBuffer(1);
 		}
+		// store the byte
+		this.buffers.getLast()[this.index++] = (byte) datum;
 	}
 
 	@Override
@@ -384,22 +382,20 @@ public class FastByteArrayOutputStream extends OutputStream {
 				// This stream doesn't have any data in it...
 				return -1;
 			}
+			if (this.nextIndexInCurrentBuffer < this.currentBufferLength) {
+				this.totalBytesRead++;
+				return this.currentBuffer[this.nextIndexInCurrentBuffer++] & 0xFF;
+			}
 			else {
-				if (this.nextIndexInCurrentBuffer < this.currentBufferLength) {
-					this.totalBytesRead++;
-					return this.currentBuffer[this.nextIndexInCurrentBuffer++] & 0xFF;
+				if (this.buffersIterator.hasNext()) {
+					this.currentBuffer = this.buffersIterator.next();
+					updateCurrentBufferLength();
+					this.nextIndexInCurrentBuffer = 0;
 				}
 				else {
-					if (this.buffersIterator.hasNext()) {
-						this.currentBuffer = this.buffersIterator.next();
-						updateCurrentBufferLength();
-						this.nextIndexInCurrentBuffer = 0;
-					}
-					else {
-						this.currentBuffer = null;
-					}
-					return read();
+					this.currentBuffer = null;
 				}
+				return read();
 			}
 		}
 

spring-core/src/main/java/org/springframework/util/MethodInvoker.java

@@ -226,14 +226,12 @@ public class MethodInvoker {
 		Method matchingMethod = null;
 
 		for (Method candidate : candidates) {
-			if (candidate.getName().equals(targetMethod)) {
-				if (candidate.getParameterCount() == argCount) {
-					Class<?>[] paramTypes = candidate.getParameterTypes();
-					int typeDiffWeight = getTypeDifferenceWeight(paramTypes, arguments);
-					if (typeDiffWeight < minTypeDiffWeight) {
-						minTypeDiffWeight = typeDiffWeight;
-						matchingMethod = candidate;
-					}
+			if (candidate.getName().equals(targetMethod) && candidate.getParameterCount() == argCount) {
+				Class<?>[] paramTypes = candidate.getParameterTypes();
+				int typeDiffWeight = getTypeDifferenceWeight(paramTypes, arguments);
+				if (typeDiffWeight < minTypeDiffWeight) {
+					minTypeDiffWeight = typeDiffWeight;
+					matchingMethod = candidate;
 				}
 			}
 		}

spring-core/src/main/java/org/springframework/util/MimeType.java

@@ -243,9 +243,7 @@ public class MimeType implements Comparable<MimeType>, Serializable {
 		if (s.length() < 2) {
 			return false;
 		}
-		else {
-			return ((s.startsWith("\"") && s.endsWith("\"")) || (s.startsWith("'") && s.endsWith("'")));
-		}
+		return ((s.startsWith("\"") && s.endsWith("\"")) || (s.startsWith("'") && s.endsWith("'")));
 	}
 
 	protected String unquote(String s) {

spring-core/src/main/java/org/springframework/util/NumberUtils.java

@@ -110,10 +110,8 @@ public abstract class NumberUtils {
 				// do not lose precision - use BigDecimal's own conversion
 				return (T) bigDecimal.toBigInteger();
 			}
-			else {
-				// original value is not a Big* number - use standard long conversion
-				return (T) BigInteger.valueOf(number.longValue());
-			}
+			// original value is not a Big* number - use standard long conversion
+			return (T) BigInteger.valueOf(number.longValue());
 		}
 		else if (Float.class == targetClass) {
 			return (T) Float.valueOf(number.floatValue());

spring-core/src/main/java/org/springframework/util/ObjectUtils.java

@@ -702,8 +702,7 @@ public abstract class ObjectUtils {
 		if (array == null) {
 			return NULL_STRING;
 		}
-		int length = array.length;
-		if (length == 0) {
+		if (array.length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringJoiner stringJoiner = new StringJoiner(ARRAY_ELEMENT_SEPARATOR, ARRAY_START, ARRAY_END);
@@ -726,8 +725,7 @@ public abstract class ObjectUtils {
 		if (array == null) {
 			return NULL_STRING;
 		}
-		int length = array.length;
-		if (length == 0) {
+		if (array.length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringJoiner stringJoiner = new StringJoiner(ARRAY_ELEMENT_SEPARATOR, ARRAY_START, ARRAY_END);
@@ -750,8 +748,7 @@ public abstract class ObjectUtils {
 		if (array == null) {
 			return NULL_STRING;
 		}
-		int length = array.length;
-		if (length == 0) {
+		if (array.length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringJoiner stringJoiner = new StringJoiner(ARRAY_ELEMENT_SEPARATOR, ARRAY_START, ARRAY_END);
@@ -774,8 +771,7 @@ public abstract class ObjectUtils {
 		if (array == null) {
 			return NULL_STRING;
 		}
-		int length = array.length;
-		if (length == 0) {
+		if (array.length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringJoiner stringJoiner = new StringJoiner(ARRAY_ELEMENT_SEPARATOR, ARRAY_START, ARRAY_END);
@@ -798,8 +794,7 @@ public abstract class ObjectUtils {
 		if (array == null) {
 			return NULL_STRING;
 		}
-		int length = array.length;
-		if (length == 0) {
+		if (array.length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringJoiner stringJoiner = new StringJoiner(ARRAY_ELEMENT_SEPARATOR, ARRAY_START, ARRAY_END);
@@ -846,8 +841,7 @@ public abstract class ObjectUtils {
 		if (array == null) {
 			return NULL_STRING;
 		}
-		int length = array.length;
-		if (length == 0) {
+		if (array.length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringJoiner stringJoiner = new StringJoiner(ARRAY_ELEMENT_SEPARATOR, ARRAY_START, ARRAY_END);