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Extract a Random instance to a variable (#1942)

This commit is contained in:
Grzegorz Piwowarek 2017-05-27 20:13:30 +02:00 committed by GitHub
parent 0ce35bb11e
commit 7c6536685c
2 changed files with 8 additions and 6 deletions
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10
core-java/src/main/java/com/baeldung/string/StringHelper.java
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@ -2,23 +2,23 @@ package com.baeldung.string;
import java.util.Optional; import java.util.Optional;
public class StringHelper { class StringHelper {
public static String removeLastChar(String s) { static String removeLastChar(String s) {
return (s == null || s.length() == 0) ? s : (s.substring(0, s.length() - 1)); return (s == null || s.length() == 0) ? s : (s.substring(0, s.length() - 1));
} }
public static String removeLastCharRegex(String s) { static String removeLastCharRegex(String s) {
return (s == null) ? s : s.replaceAll(".$", ""); return (s == null) ? s : s.replaceAll(".$", "");
} }
public static String removeLastCharOptional(String s) { static String removeLastCharOptional(String s) {
return Optional.ofNullable(s) return Optional.ofNullable(s)
.filter(str -> str.length() != 0) .filter(str -> str.length() != 0)
.map(str -> str.substring(0, str.length() - 1)) .map(str -> str.substring(0, str.length() - 1))
.orElse(s); .orElse(s);
} }
public static String removeLastCharRegexOptional(String s) { static String removeLastCharRegexOptional(String s) {
return Optional.ofNullable(s) return Optional.ofNullable(s)
.map(str -> str.replaceAll(".$", "")) .map(str -> str.replaceAll(".$", ""))
.orElse(s); .orElse(s);

4
core-java/src/test/java/org/baeldung/java/JavaRandomUnitTest.java
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@ -167,9 +167,11 @@ public class JavaRandomUnitTest {
final int leftLimit = 97; // letter 'a' final int leftLimit = 97; // letter 'a'
final int rightLimit = 122; // letter 'z' final int rightLimit = 122; // letter 'z'
final int targetStringLength = 10; final int targetStringLength = 10;
final Random random = new Random();
final StringBuilder buffer = new StringBuilder(targetStringLength); final StringBuilder buffer = new StringBuilder(targetStringLength);
for (int i = 0; i < targetStringLength; i++) { for (int i = 0; i < targetStringLength; i++) {
final int randomLimitedInt = leftLimit + (int) (new Random().nextFloat() * (rightLimit - leftLimit + 1)); final int randomLimitedInt = leftLimit + (int) (random.nextFloat() * (rightLimit - leftLimit + 1));
buffer.append((char) randomLimitedInt); buffer.append((char) randomLimitedInt);
} }
final String generatedString = buffer.toString(); final String generatedString = buffer.toString();