add isEmpty and isNotEmpty

src/main/java/com/imyeyu/java/TimiJava.java

@@ -3,6 +3,7 @@ package com.imyeyu.java;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Map;
 
 /**
@@ -68,6 +69,14 @@ public interface TimiJava {
 		return !isEmpty(object);
 	}
 
+	static <T> T defaultIfNull(T obj, T defaultObj) {
+		return firstNotNull(obj, defaultObj);
+	}
+
+	static <T> T defaultIfEmpty(T obj, T defaultObj) {
+		return firstNotEmpty(obj, defaultObj);
+	}
+
 	@SafeVarargs
 	static <T> T firstNotNull(T... objects) {
 		for (int i = 0; i < objects.length; i++) {
@@ -94,4 +103,8 @@ public interface TimiJava {
 		e.printStackTrace(pw);
 		return sw.toString();
 	}
+
+	static <T> Iterable<T> safeIterable(Iterable<T> iterable) {
+		return defaultIfNull(iterable, Collections::emptyIterator);
+	}
 }

src/main/java/com/imyeyu/java/bean/BasePageResult.java

@@ -18,6 +18,24 @@ public class BasePageResult<T> {
 
 	protected List<T> list;
 
+	/**
+	 * 结果是否为空
+	 *
+	 * @return true 为空
+	 */
+	public boolean isEmpty() {
+		return list.isEmpty();
+	}
+
+	/**
+	 * 结果是否非空
+	 *
+	 * @return true 为非空
+	 */
+	public boolean isNotEmpty() {
+		return !isEmpty();
+	}
+
 	/**
 	 * 获取总数据量
 	 *