Use String.repeat() and pattern matching instanceof

Closes gh-27834

spring-jdbc/src/main/java/org/springframework/jdbc/core/ArgumentTypePreparedStatementSetter.java

@@ -61,8 +61,7 @@ public class ArgumentTypePreparedStatementSetter implements PreparedStatementSet
 		if (this.args != null && this.argTypes != null) {
 			for (int i = 0; i < this.args.length; i++) {
 				Object arg = this.args[i];
-				if (arg instanceof Collection && this.argTypes[i] != Types.ARRAY) {
-					Collection<?> entries = (Collection<?>) arg;
+				if (arg instanceof Collection<?> entries && this.argTypes[i] != Types.ARRAY) {
 					for (Object entry : entries) {
 						if (entry instanceof Object[] valueArray) {
 							for (Object argValue : valueArray) {

spring-jdbc/src/main/java/org/springframework/jdbc/core/PreparedStatementCreatorFactory.java

@@ -265,8 +265,7 @@ public class PreparedStatementCreatorFactory {
 					}
 					declaredParameter = declaredParameters.get(i);
 				}
-				if (in instanceof Iterable && declaredParameter.getSqlType() != Types.ARRAY) {
-					Iterable<?> entries = (Iterable<?>) in;
+				if (in instanceof Iterable<?> entries && declaredParameter.getSqlType() != Types.ARRAY) {
 					for (Object entry : entries) {
 						if (entry instanceof Object[] valueArray) {
 							for (Object argValue : valueArray) {

spring-jdbc/src/main/java/org/springframework/jdbc/support/incrementer/AbstractDataFieldMaxValueIncrementer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -133,12 +133,7 @@ public abstract class AbstractDataFieldMaxValueIncrementer implements DataFieldM
 		String s = Long.toString(getNextKey());
 		int len = s.length();
 		if (len < this.paddingLength) {
-			StringBuilder sb = new StringBuilder(this.paddingLength);
-			for (int i = 0; i < this.paddingLength - len; i++) {
-				sb.append('0');
-			}
-			sb.append(s);
-			s = sb.toString();
+			s = "0".repeat(this.paddingLength - len) + s;
 		}
 		return s;
 	}