bug fix for parse double value, for issue #959

alibaba · Nov 24, 2022 · 5e7a0d5 · 5e7a0d5
1 parent 36419b4
commit 5e7a0d5
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diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONReader.java b/core/src/main/java/com/alibaba/fastjson2/JSONReader.java
@@ -2387,11 +2387,16 @@ public Number getNumber() {
                     BigInteger bigInt = getBigInt(negative, mag);
                     int adjustedScale = scale - exponent;
                     decimal = new BigDecimal(bigInt, adjustedScale);
+
+                    if (exponent != 0) {
+                        return decimal.doubleValue();
+                    }
                 }
 
                 if (exponent != 0) {
+                    String decimalStr = decimal.toPlainString();
                     double doubleValue = Double.parseDouble(
-                            decimal + "E" + exponent);
+                            decimalStr + "E" + exponent);
                     return Double.valueOf(doubleValue);
                 }
 

diff --git a/core/src/test/java/com/alibaba/fastjson2/issues/Issue959.java b/core/src/test/java/com/alibaba/fastjson2/issues/Issue959.java
@@ -0,0 +1,16 @@
+package com.alibaba.fastjson2.issues;
+
+import com.alibaba.fastjson2.JSON;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue959 {
+    @Test
+    public void test() {
+        assertEquals(
+                -2.0089457919266330204e-15,
+                JSON.parseObject("{\"V\": -2.0089457919266330204e-15}").get("V")
+        );
+    }
+}