eclipse上的语法错误[关闭]
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【中文标题】eclipse上的语法错误[关闭]【英文标题】：Syntax error on eclipse [closed] 【发布时间】：2014-01-20 22:39:20 【问题描述】：我的代码中的X's 变红了，因为我有关闭。他们对我来说都很好，IDE坚持认为我错了。我不确定为什么这是不正确的。有人可以指导我吗，谢谢！
错误发生在最后2个关闭
1 错误：
Syntax error on token "", expected after this
token
2 错误：
Syntax error, insert "" to complete
ClassBody
这是我的代码
public class BinaryTree
// root node pointer. Will be null for an empty tree
private Node root;
/*
-- Node --
The binary tree is built using this nested node class.
Each node stores on data element, and has left and right
sub-tree pointer which may be null.
The node is a "dumb" nested class -- we just use it for storage;
*/
private static class Node // Node class
Node left;
Node right;
int data;
Node(int newData) // create Node
left = null;
right = null;
data = newData;
/*
Creates an empty binary tree == null root pointer
*/
public void BinaryTree()
root = null;
/*
Returns true if the given target is in the binary tree
*/
public boolean lookup(int data) // look up a number
return(lookup(root, data)); // use this to parse through a tree to search for element
/*
recursive lookup -- given a node, recur
down searching for the given data.
*/
private boolean lookup(Node node, int data)
if (node == null)
return(false);
if (data == node.data)
return(true);
else if (data < node.data)
return(lookup(node.left, data));
else
return(lookup(node.right, data));
public void insert(int data)
root = insert(root, data);
/*
Recursive insert -- given a pointer, recur down
and insert the given data into the tree. Returns the new
node pointer (the standard way to communicate
a changed pointer back to the caller).
*/
private Node insert(Node node, int data)
if (node == null)
node = new Node(data);
else
if (data <= node.data)
node.left = insert(node.left, data);
else
node.right = insert(node.right, data);
// I get an error here #1
return (node);
// I also get an error here #2
【问题讨论】：
return (node); 不在方法内。它可能应该高 2 行...
请不要再为这样一个微不足道的问题发布答案。我相信 OP 可以在一点点帮助下自己回答他的问题。
通常日食会获胜..
【参考方案1】：
您在任何方法之外的类末尾返回，这是一个错误。
【讨论】：
【参考方案2】：完整的工作代码
public class BinaryTree
// root node pointer. Will be null for an empty tree
private Node root;
/*
-- Node --
The binary tree is built using this nested node class.
Each node stores on data element, and has left and right
sub-tree pointer which may be null.
The node is a "dumb" nested class -- we just use it for storage;
*/
private static class Node // Node class
Node left;
Node right;
int data;
Node(int newData) // create Node
left = null;
right = null;
data = newData;
/*
Creates an empty binary tree == null root pointer
*/
public void BinaryTree()
root = null;
/*
Returns true if the given target is in the binary tree
*/
public boolean lookup(int data) // look up a number
return(lookup(root, data)); // use this to parse through a tree to search for element
/*
recursive lookup -- given a node, recur
down searching for the given data.
*/
private boolean lookup(Node node, int data)
if (node == null)
return(false);
if (data == node.data)
return(true);
else if (data < node.data)
return(lookup(node.left, data));
else
return(lookup(node.right, data));
public void insert(int data)
root = insert(root, data);
/*
Recursive insert -- given a pointer, recur down
and insert the given data into the tree. Returns the new
node pointer (the standard way to communicate
a changed pointer back to the caller).
*/
private Node insert(Node node, int data)
if (node == null)
node = new Node(data);
else
if (data <= node.data)
node.left = insert(node.left, data);
else
node.right = insert(node.right, data);
// I get an error here #1
return (node);
//
【讨论】：
【参考方案3】：将插入更改为：
private Node insert(Node node, int data)
if (node == null)
node = new Node(data);
else
if (data <= node.data)
node.left = insert(node.left, data);
else
node.right = insert(node.right, data);
return (node);
在 eclipse 中：按 Ctrl + a 然后 Ctrl+shift+f 格式化代码..你会很容易知道这样的错误......
【讨论】：
【参考方案4】：错误是因为你有以下语句
return (node);
在你的 insert 方法之外
【讨论】：
【参考方案5】： private Node insert(Node node, int data)
if (node == null)
node = new Node(data);
else
if (data <= node.data)
node.left = insert(node.left, data);
else
node.right = insert(node.right, data);
--> return (node);// I get an error here #1
--->
你在外面写了return语句。我把它搬了进去。请更新。
【讨论】：
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