Create SinglyLinkedList.java

src/main/java/com/nbee/solution/practice/SinglyLinkedList.java

@@ -0,0 +1,39 @@
+package com.nbee.solution.practice;
+
+import java.util.function.Consumer;
+
+/**
+ * 链表类
+ */
+public class SinglyLinkedList {
+    private Node head;
+    private static class Node {
+        int value;
+        Node next;
+
+        Node(int value, Node next) {
+            this.value = value;
+            this.next = next;
+        }
+    }
+    public void addFirst(int value) {
+        //链表为空
+//        head = new Node(value,null);
+        //链表非空，包含了链表为空的情况
+        head = new Node(value,head);
+    }
+    public void loop(Consumer<Integer> consumer) {
+        Node p = head;
+        while (p != null) {
+            consumer.accept(p.value);
+            p = p.next;
+        }
+    }
+    
+    public void loop0 (Consumer<Integer> consumer){
+        for (Node p = head; p != null; p = p.next) {
+            consumer.accept(p.value);
+        }
+    }
+}
+