Let existing catch clause handle the NPE edge case

Add tests

src/main/java/org/apache/commons/lang3/math/NumberUtils.java

@@ -784,7 +784,6 @@ public class NumberUtils {
     public static byte max(final byte... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns max
         byte max = array[0];
         for (int i = 1; i < array.length; i++) {
@@ -792,7 +791,6 @@ public class NumberUtils {
                 max = array[i];
             }
         }
-
         return max;
     }
 
@@ -827,7 +825,6 @@ public class NumberUtils {
     public static double max(final double... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns max
         double max = array[0];
         for (int j = 1; j < array.length; j++) {
@@ -838,7 +835,6 @@ public class NumberUtils {
                 max = array[j];
             }
         }
-
         return max;
     }
 
@@ -871,7 +867,6 @@ public class NumberUtils {
     public static float max(final float... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns max
         float max = array[0];
         for (int j = 1; j < array.length; j++) {
@@ -882,7 +877,6 @@ public class NumberUtils {
                 max = array[j];
             }
         }
-
         return max;
     }
 
@@ -949,7 +943,6 @@ public class NumberUtils {
     public static int max(final int... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns max
         int max = array[0];
         for (int j = 1; j < array.length; j++) {
@@ -957,7 +950,6 @@ public class NumberUtils {
                 max = array[j];
             }
         }
-
         return max;
     }
 
@@ -991,7 +983,6 @@ public class NumberUtils {
     public static long max(final long... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns max
         long max = array[0];
         for (int j = 1; j < array.length; j++) {
@@ -999,7 +990,6 @@ public class NumberUtils {
                 max = array[j];
             }
         }
-
         return max;
     }
 
@@ -1042,7 +1032,6 @@ public class NumberUtils {
                 max = array[i];
             }
         }
-
         return max;
     }
 
@@ -1076,7 +1065,6 @@ public class NumberUtils {
     public static byte min(final byte... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns min
         byte min = array[0];
         for (int i = 1; i < array.length; i++) {
@@ -1084,7 +1072,6 @@ public class NumberUtils {
                 min = array[i];
             }
         }
-
         return min;
     }
 
@@ -1130,7 +1117,6 @@ public class NumberUtils {
                 min = array[i];
             }
         }
-
         return min;
     }
 
@@ -1174,7 +1160,6 @@ public class NumberUtils {
                 min = array[i];
             }
         }
-
         return min;
     }
 
@@ -1206,7 +1191,6 @@ public class NumberUtils {
     public static int min(final int... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns min
         int min = array[0];
         for (int j = 1; j < array.length; j++) {
@@ -1214,7 +1198,6 @@ public class NumberUtils {
                 min = array[j];
             }
         }
-
         return min;
     }
 
@@ -1248,7 +1231,6 @@ public class NumberUtils {
     public static long min(final long... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns min
         long min = array[0];
         for (int i = 1; i < array.length; i++) {
@@ -1256,7 +1238,6 @@ public class NumberUtils {
                 min = array[i];
             }
         }
-
         return min;
     }
 
@@ -1291,7 +1272,6 @@ public class NumberUtils {
     public static short min(final short... array) {
         // Validates input
         validateArray(array);
-
         // Finds and returns min
         short min = array[0];
         for (int i = 1; i < array.length; i++) {
@@ -1360,12 +1340,9 @@ public class NumberUtils {
      * @since 2.5
      */
     public static byte toByte(final String str, final byte defaultValue) {
-        if (str == null) {
-            return defaultValue;
-        }
         try {
             return Byte.parseByte(str);
-        } catch (final NumberFormatException nfe) {
+        } catch (final RuntimeException e) {
             return defaultValue;
         }
     }
@@ -1453,12 +1430,9 @@ public class NumberUtils {
      * @since 2.1
      */
     public static double toDouble(final String str, final double defaultValue) {
-      if (str == null) {
-          return defaultValue;
-      }
       try {
           return Double.parseDouble(str);
-      } catch (final NumberFormatException nfe) {
+      } catch (final RuntimeException e) {
           return defaultValue;
       }
     }
@@ -1505,12 +1479,9 @@ public class NumberUtils {
      * @since 2.1
      */
     public static float toFloat(final String str, final float defaultValue) {
-      if (str == null) {
-          return defaultValue;
-      }
       try {
           return Float.parseFloat(str);
-      } catch (final NumberFormatException nfe) {
+      } catch (final RuntimeException e) {
           return defaultValue;
       }
     }
@@ -1554,12 +1525,9 @@ public class NumberUtils {
      * @since 2.1
      */
     public static int toInt(final String str, final int defaultValue) {
-        if (str == null) {
-            return defaultValue;
-        }
         try {
             return Integer.parseInt(str);
-        } catch (final NumberFormatException nfe) {
+        } catch (final RuntimeException e) {
             return defaultValue;
         }
     }
@@ -1603,12 +1571,9 @@ public class NumberUtils {
      * @since 2.1
      */
     public static long toLong(final String str, final long defaultValue) {
-        if (str == null) {
-            return defaultValue;
-        }
         try {
             return Long.parseLong(str);
-        } catch (final NumberFormatException nfe) {
+        } catch (final RuntimeException e) {
             return defaultValue;
         }
     }
@@ -1807,12 +1772,9 @@ public class NumberUtils {
      * @since 2.5
      */
     public static short toShort(final String str, final short defaultValue) {
-        if (str == null) {
-            return defaultValue;
-        }
         try {
             return Short.parseShort(str);
-        } catch (final NumberFormatException nfe) {
+        } catch (final RuntimeException e) {
             return defaultValue;
         }
     }

src/test/java/org/apache/commons/lang3/math/NumberUtilsTest.java

@@ -1612,6 +1612,8 @@ public class NumberUtilsTest extends AbstractLangTest {
         assertEquals(NumberUtils.toDouble("-001.2345", 5.1d), -1.2345d, "toDouble(String, int) 4 failed");
         assertEquals(1.2345d, NumberUtils.toDouble("+001.2345", 5.1d), "toDouble(String, int) 5 failed");
         assertEquals(0d, NumberUtils.toDouble("000.00", 5.1d), "toDouble(String, int) 7 failed");
+        assertEquals(5.1d, NumberUtils.toDouble("", 5.1d));
+        assertEquals(5.1d, NumberUtils.toDouble((String) null, 5.1d));
     }
 
     /**
@@ -1632,6 +1634,8 @@ public class NumberUtilsTest extends AbstractLangTest {
     public void testToByteStringI() {
         assertEquals(123, NumberUtils.toByte("123", (byte) 5), "toByte(String, byte) 1 failed");
         assertEquals(5, NumberUtils.toByte("12.3", (byte) 5), "toByte(String, byte) 2 failed");
+        assertEquals(5, NumberUtils.toByte("", (byte) 5));
+        assertEquals(5, NumberUtils.toByte(null, (byte) 5));
     }
 
     /**
@@ -1665,6 +1669,8 @@ public class NumberUtilsTest extends AbstractLangTest {
         assertEquals(5.0f, NumberUtils.toFloat("-001Z.2345", 5.0f), "toFloat(String, int) 3 failed");
         assertEquals(5.0f, NumberUtils.toFloat("+001AB.2345", 5.0f), "toFloat(String, int) 4 failed");
         assertEquals(5.0f, NumberUtils.toFloat("001Z.2345", 5.0f), "toFloat(String, int) 5 failed");
+        assertEquals(5.0f, NumberUtils.toFloat("", 5.0f));
+        assertEquals(5.0f, NumberUtils.toFloat(null, 5.0f));
     }
 
     /**
@@ -1685,6 +1691,8 @@ public class NumberUtilsTest extends AbstractLangTest {
     public void testToIntStringI() {
         assertEquals(12345, NumberUtils.toInt("12345", 5), "toInt(String, int) 1 failed");
         assertEquals(5, NumberUtils.toInt("1234.5", 5), "toInt(String, int) 2 failed");
+        assertEquals(5, NumberUtils.toInt("", 5));
+        assertEquals(5, NumberUtils.toInt(null, 5));
     }
 
     /**
@@ -1709,6 +1717,8 @@ public class NumberUtilsTest extends AbstractLangTest {
     public void testToLongStringL() {
         assertEquals(12345L, NumberUtils.toLong("12345", 5L), "toLong(String, long) 1 failed");
         assertEquals(5L, NumberUtils.toLong("1234.5", 5L), "toLong(String, long) 2 failed");
+        assertEquals(5L, NumberUtils.toLong("", 5L));
+        assertEquals(5L, NumberUtils.toLong(null, 5L));
     }
 
     /**
@@ -1823,7 +1833,7 @@ public class NumberUtilsTest extends AbstractLangTest {
         assertEquals("23521.0000", NumberUtils.toScaledBigDecimal(Float.valueOf(23.521f), 4, RoundingMode.HALF_EVEN)
             .multiply(BigDecimal.valueOf(1000)).toString(), "toScaledBigDecimal(Float, int, RoundingMode) 4 failed");
         assertEquals(NumberUtils.toScaledBigDecimal((Float) null, 2, RoundingMode.HALF_UP), BigDecimal.ZERO,
-            "toScaledBigDecimal(Float, int, RoundingMode) 5 failed");
+                "toScaledBigDecimal(Float, int, RoundingMode) 5 failed");
     }
 
     /**
@@ -1841,7 +1851,7 @@ public class NumberUtilsTest extends AbstractLangTest {
         assertEquals("2352.00", NumberUtils.toScaledBigDecimal("23.525").multiply(BigDecimal.valueOf(100)).toString(),
             "toScaledBigDecimal(String) 4 failed");
         assertEquals(NumberUtils.toScaledBigDecimal((String) null), BigDecimal.ZERO,
-            "toScaledBigDecimal(String) 5 failed");
+                "toScaledBigDecimal(String) 5 failed");
     }
 
     /**
@@ -1860,7 +1870,7 @@ public class NumberUtilsTest extends AbstractLangTest {
                 .multiply(BigDecimal.valueOf(1000)).toString(),
             "toScaledBigDecimal(String, int, RoundingMode) 4 failed");
         assertEquals(NumberUtils.toScaledBigDecimal((String) null, 2, RoundingMode.HALF_UP), BigDecimal.ZERO,
-            "toScaledBigDecimal(String, int, RoundingMode) 5 failed");
+                "toScaledBigDecimal(String, int, RoundingMode) 5 failed");
     }
 
     /**
@@ -1881,5 +1891,7 @@ public class NumberUtilsTest extends AbstractLangTest {
     public void testToShortStringI() {
         assertEquals(12345, NumberUtils.toShort("12345", (short) 5), "toShort(String, short) 1 failed");
         assertEquals(5, NumberUtils.toShort("1234.5", (short) 5), "toShort(String, short) 2 failed");
+        assertEquals(5, NumberUtils.toShort("", (short) 5));
+        assertEquals(5, NumberUtils.toShort(null, (short) 5));
     }
 }