BAEL-3678 - Generating Random Numbers - Initial commit (#8491)

* BAEL-3678 - Initial commit * BAEL-3678 - Test added * BAEL-3678 - Generated multiple methods and tests * BAEL-3678 - Test improvement
2020-01-10 22:48:48 +01:00
parent c7665cd1cf
commit 0b62119737
3 changed files with 233 additions and 0 deletions
--- a/java-numbers-2/src/main/java/com/baeldung/randomnumbers/RandomNumbersGenerator.java
+++ b/java-numbers-2/src/main/java/com/baeldung/randomnumbers/RandomNumbersGenerator.java
@@ -0,0 +1,91 @@
+package com.baeldung.randomnumbers;
+
+import java.security.SecureRandom;
+import java.util.Random;
+import java.util.SplittableRandom;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.stream.IntStream;
+
+import org.apache.commons.math3.random.RandomDataGenerator;
+
+import it.unimi.dsi.util.XoRoShiRo128PlusRandom;
+
+public class RandomNumbersGenerator {
+
+    public Integer generateRandomWithMathRandom(int max, int min) {
+        return (int) ((Math.random() * (max - min)) + min);
+    }
+
+    public Integer generateRandomWithNextInt() {
+        Random random = new Random();
+        int randomWithNextInt = random.nextInt();
+        return randomWithNextInt;
+    }
+
+    public Integer generateRandomWithNextIntWithinARange(int min, int max) {
+        Random random = new Random();
+        int randomWintNextIntWithinARange = random.nextInt(max - min) + min;
+        return randomWintNextIntWithinARange;
+    }
+
+    public IntStream generateRandomUnlimitedIntStream() {
+        Random random = new Random();
+        IntStream unlimitedIntStream = random.ints();
+        return unlimitedIntStream;
+    }
+
+    public IntStream generateRandomLimitedIntStream(long streamSize) {
+        Random random = new Random();
+        IntStream limitedIntStream = random.ints(streamSize);
+        return limitedIntStream;
+    }
+
+    public IntStream generateRandomLimitedIntStreamWithinARange(int min, int max, long streamSize) {
+        Random random = new Random();
+        IntStream limitedIntStreamWithinARange = random.ints(streamSize, min, max);
+        return limitedIntStreamWithinARange;
+    }
+
+    public Integer generateRandomWithThreadLocalRandom() {
+        int randomWithThreadLocalRandom = ThreadLocalRandom.current()
+            .nextInt();
+        return randomWithThreadLocalRandom;
+    }
+
+    public Integer generateRandomWithThreadLocalRandomInARange(int min, int max) {
+        int randomWithThreadLocalRandomInARange = ThreadLocalRandom.current()
+            .nextInt(min, max);
+        return randomWithThreadLocalRandomInARange;
+    }
+
+    public Integer generateRandomWithThreadLocalRandomFromZero(int max) {
+        int randomWithThreadLocalRandomFromZero = ThreadLocalRandom.current()
+            .nextInt(max);
+        return randomWithThreadLocalRandomFromZero;
+    }
+
+    public Integer generateRandomWithSplittableRandom(int min, int max) {
+        SplittableRandom splittableRandom = new SplittableRandom();
+        int randomWithSplittableRandom = splittableRandom.nextInt(min, max);
+        return randomWithSplittableRandom;
+    }
+
+    public Integer generateRandomWithSecureRandom() {
+        SecureRandom secureRandom = new SecureRandom();
+        int randomWithSecureRandom = secureRandom.nextInt();
+        return randomWithSecureRandom;
+    }
+
+    public Integer generateRandomWithRandomDataGenerator(int min, int max) {
+        RandomDataGenerator randomDataGenerator = new RandomDataGenerator();
+        int randomWithRandomDataGenerator = randomDataGenerator.nextInt(min, max);
+        return randomWithRandomDataGenerator;
+    }
+
+    public Integer generateRandomWithXoRoShiRo128PlusRandom(int min, int max) {
+        XoRoShiRo128PlusRandom xoroRandom = new XoRoShiRo128PlusRandom();
+        int randomWithXoRoShiRo128PlusRandom = xoroRandom.nextInt(max - min) + min;
+        return randomWithXoRoShiRo128PlusRandom;
+    }
+
+}