添加针对 int long double类型的sum和avg方法

hutool-core/src/main/java/cn/hutool/core/stream/EasyStream.java

@@ -5,6 +5,7 @@ import cn.hutool.core.util.ArrayUtil;
 import cn.hutool.core.util.ObjUtil;
 
 import java.util.Objects;
+import java.util.OptionalDouble;
 import java.util.Spliterator;
 import java.util.function.*;
 import java.util.stream.Stream;
@@ -264,6 +265,74 @@ public class EasyStream<T> extends AbstractEnhancedWrappedStream<T, EasyStream<T
 		return new EasyStream<>(stream);
 	}
 
+
+
+
+	/**
+	 * 计算int类型总和
+	 *
+	 * @param mapper 映射
+	 * @return int
+	 */
+	public int sum(ToIntFunction<? super T> mapper) {
+		return stream.mapToInt(mapper).sum();
+	}
+
+	/**
+	 * 计算long类型总和
+	 *
+	 * @param mapper 映射
+	 * @return long
+	 */
+	public long sum(ToLongFunction<? super T> mapper) {
+		return stream.mapToLong(mapper).sum();
+	}
+
+
+	/**
+	 * 计算double总和
+	 *
+	 * @param mapper 映射器
+	 * @return double
+	 */
+	public double sum(ToDoubleFunction<? super T> mapper) {
+		return stream.mapToDouble(mapper).sum();
+	}
+
+
+
+	/**
+	 * 计算int平均值
+	 *
+	 * @param mapper 映射器
+	 * @return {@link Integer}
+	 */
+	public OptionalDouble avg(ToIntFunction<? super T> mapper) {
+		return stream.mapToInt(mapper).average();
+	}
+
+	/**
+	 * 计算double平均值
+	 *
+	 * @param mapper 映射
+	 * @return {@link OptionalDouble}
+	 */
+	public OptionalDouble avg(ToDoubleFunction<? super T> mapper) {
+		return stream.mapToDouble(mapper).average();
+	}
+
+
+	/**
+	 * 计算double平均值
+	 *
+	 * @param mapper 映射
+	 * @return {@link OptionalDouble}
+	 */
+	public OptionalDouble avg(ToLongFunction<? super T> mapper) {
+		return stream.mapToLong(mapper).average();
+	}
+
+
 	/**
 	 * 建造者
 	 *

hutool-core/src/test/java/cn/hutool/core/stream/EasyStreamTest.java

@@ -433,4 +433,13 @@ public class EasyStreamTest {
 		Assert.assertTrue(EasyStream.of(1).isNotEmpty());
 	}
 
+
+	@Test
+	public void testIntSum() {
+		int sum = EasyStream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10).sum(Integer::intValue);
+		Assert.assertEquals(sum,55);
+		double doubleSum = EasyStream.of(1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, 10.10).sum(Double::doubleValue);
+		Assert.assertEquals(doubleSum,59.6);
+	}
+
 }