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添加Java版本的链表ListNode类
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@ -143,7 +143,30 @@ head->val = 5;
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Java:
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```java
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public class ListNode {
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// 结点的值
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int val;
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// 下一个结点
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ListNode next;
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// 节点的构造函数(无参)
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public ListNode() {
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}
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// 节点的构造函数(有一个参数)
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public ListNode(int val) {
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this.val = val;
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}
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// 节点的构造函数(有两个参数)
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public ListNode(int val, ListNode next) {
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this.val = val;
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this.next = next;
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}
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}
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```
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Python:
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