optimize: 优化 NumberUtils.convertScientificToNormal(String)，当不是科学计数法时，直接返回。

Author: wangliang181230

core-parent/core/src/main/java/icu/easyj/core/util/NumberUtils.java

@@ -31,6 +31,9 @@ public abstract class NumberUtils {
 	 */
 	public static String convertScientificToNormal(String scientificNumberStr) {
 		int indexE = scientificNumberStr.toUpperCase().indexOf("E");
+		if (indexE < 0) {
+			return scientificNumberStr;
+		}
 
 		int exponential = Integer.parseInt(scientificNumberStr.substring(indexE + 1));
 
@@ -65,12 +68,7 @@ public static String convertScientificToNormal(String scientificNumberStr) {
 	}
 
 	public static String doubleToString(Double d) {
-		String doubleStr = d.toString();
-		if (doubleStr.contains("E")) {
-			return convertScientificToNormal(doubleStr);
-		} else {
-			return doubleStr;
-		}
+		return convertScientificToNormal(d.toString());
 	}
 
 }

core-parent/core/src/test/java/icu/easyj/core/util/NumberUtilsTest.java

@@ -15,6 +15,8 @@ public class NumberUtilsTest {
 	 */
 	@Test
 	public void test_convertScientificToNormal() {
+		Assertions.assertEquals("123456789", NumberUtils.convertScientificToNormal("123456789"));
+
 		Assertions.assertEquals("123456789", NumberUtils.convertScientificToNormal("1.23456789E8"));
 		Assertions.assertEquals("123456789.1", NumberUtils.convertScientificToNormal("1.234567891E8"));
 		Assertions.assertEquals("123456789.12", NumberUtils.convertScientificToNormal("1.2345678912E8"));