Replace for loops with String.repeat where appropriate

Author: fmbenhassine

spring-batch-core/src/test/java/org/springframework/batch/core/repository/dao/JdbcStepExecutionDaoTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2008-2022 the original author or authors.
+ * Copyright 2008-2023 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.
@@ -49,9 +49,7 @@ protected JobRepository getJobRepository() {
 	void testTruncateExitDescription() {
 
 		StringBuilder sb = new StringBuilder();
-		for (int i = 0; i < 100; i++) {
-			sb.append("too long exit description");
-		}
+		sb.append("too long exit description".repeat(100));
 		String longDescription = sb.toString();
 
 		ExitStatus exitStatus = ExitStatus.FAILED.addExitDescription(longDescription);

spring-batch-infrastructure/src/test/java/org/springframework/batch/item/file/transform/FormatterLineAggregatorTests.java

@@ -26,6 +26,7 @@
  * Unit tests for {@link FormatterLineAggregator}
  *
  * @author Dave Syer
+ * @author Mahmoud Ben Hassine
  */
 class FormatterLineAggregatorTests {
 
@@ -120,9 +121,7 @@ public Object[] extract(String[] item) {
 					strings[i] = item[i];
 					if (item[i].length() < widths[i]) {
 						StringBuilder buffer = new StringBuilder(strings[i]);
-						for (int j = 0; j < (widths[i] - item[i].length() + 1) / 2; j++) {
-							buffer.append(" ");
-						}
+						buffer.append(" ".repeat(Math.max(0, (widths[i] - item[i].length() + 1) / 2)));
 						strings[i] = buffer.toString();
 					}
 				}
@@ -155,9 +154,7 @@ public Object[] extract(String[] item) {
 					strings[i] = item[i];
 					if (item[i].length() < widths[i]) {
 						StringBuilder buffer = new StringBuilder(strings[i]);
-						for (int j = 0; j < widths[i] - item[i].length(); j++) {
-							buffer.append(".");
-						}
+						buffer.append(".".repeat(Math.max(0, widths[i] - item[i].length())));
 						strings[i] = buffer.toString();
 					}
 				}