BAEL-4142 (#9622)

- Code snippets for Integer to binary string conversion

java-numbers-3/src/main/java/com/baeldung/integerToBinary/IntegerToBinary.java

@@ -0,0 +1,17 @@
+package com.baeldung.integerToBinary;
+
+public class IntegerToBinary {
+    public static String convertIntegerToBinary(int n) {
+        if(n == 0) {
+            return "0";
+        }
+        StringBuilder binaryNumber = new StringBuilder();
+        while (n > 0) {
+            int remainder = n % 2;
+            binaryNumber.append(remainder);
+            n /= 2;
+        }
+        binaryNumber = binaryNumber.reverse();
+        return binaryNumber.toString();
+    }
+}

java-numbers-3/src/test/java/com/baeldung/integerToBinary/IntegerToBinaryUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.integerToBinary;
+
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+public class IntegerToBinaryUnitTest {
+    @Test
+    public void givenAnInteger_whenConvertToBinary_thenGetBinaryString() {
+        int n = 7;
+        String binaryString = IntegerToBinary.convertIntegerToBinary(n);
+        assertEquals("111", binaryString);
+    }
+
+    @Test
+    public void givenAnInteger_whenToBinaryStringCalled_thenGetBinaryString() {
+        int n = 7;
+        String binaryString = Integer.toBinaryString(n);
+        assertEquals("111", binaryString);
+    }
+
+    @Test
+    public void givenAnInteger_whenToStringCalled_thenGetBinaryString() {
+        int n = 7;
+        String binaryString = Integer.toString(n, 2);
+        assertEquals("111", binaryString);
+    }
+}