Thread: BinaryTree

package SystemandDesign.BinaryTree;
 
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import java.io.ObjectInputStream;
 
public class BinaryTree{
 
  private int data;
  private List list;
  private BinaryTree root;
  private BinaryTree leftSubtree;
  private BinaryTree rightSubtree;
  private ObjectInputStream input;
 
  public BinaryTree(int value){
 
    this.data = value;
    this.leftSubtree = null;
    this.rightSubtree = null;
    this.root = null;
 
  }
 
  public int getData(){
 
    return this.data;
 
  }
 
  public void insert(int value){
 
    if(root == null){//starts a new Binary tree
      root = new BinaryTree(value);
    }
 
    if(value < data){//if the data being inserted is less than the original data, it will be inserted to the left side.
 
      if(leftSubtree == null){
        leftSubtree = new BinaryTree(value);
      }
      else{
        leftSubtree.insert(value);
      }
 
    }
    else if(value > data){//right side of binary tree
 
      if(rightSubtree == null){
        rightSubtree = new BinaryTree(value);
      }
      else{
        rightSubtree.insert(value);
      }
 
    }
 
 
  }
 
  public void inOrder(BinaryTree leaf){
 
    if(leaf != null){
      inOrder(leaf.leftSubtree);
      System.out.print(leaf.data+"");
      inOrder(leaf.rightSubtree);
 
 
  }
 
}
 
  public static void main(String[] args){
 
    BinaryTree.openFile();
    BinaryTree.readFile();
    BinaryTree.closeFile();
  }
 
  public void openFile(){
    try{
    input = new ObjectInputStream(new FileInputStream("data.ser"));
  }catch(IOException ioException){
    System.err.println("Error opening file.");
  }
  }
  public void readFile(){ 
  try{
     list = (List<Integer>)input.readObject();
  }catch(IOException e){
    System.err.println("Error class not found.");
  }catch(ClassNotFoundException i){
    System.err.println("Error");
  }
  }
  public void closeFile(){
    try{
      if(input != null)
        input.close();
    }catch(IOException ioException){
      System.err.println("Error closing file.");
      System.exit(1);
    }
  }
}

So I am having trouble with trying to get the main method to work. The program is supposed to construct a BinaryTree, and deserialize a file that is used for the Tree.

Define " I am having trouble with trying to get the main method to work". What error messages do you get, if any?

Originally Posted by camel-man

Define " I am having trouble with trying to get the main method to work". What error messages do you get, if any?

Cannot make a static reference to the non-static method openFile() from type SystemandDesign.BinaryTree.BinaryTree(same with readFile() and closeFile();

You need to make your methods static. ex.)static public void readFile(){
.....

Originally Posted by camel-man

You need to make your methods static. ex.)static public void readFile(){
.....

getting 5 errors now:

Cannot make static reference to the non-static field input
" " list

3 errors and 3 warnings found:
--------------
*** Errors ***
--------------
File: C:\Users\Carlos Satres\Documents\SystemandDesign\BinaryTree\Binary Tree.java [line: 76]
Error: Cannot make a static reference to the non-static method openFile() from the type SystemandDesign.BinaryTree.BinaryTree
File: C:\Users\Carlos Satres\Documents\SystemandDesign\BinaryTree\Binary Tree.java [line: 77]
Error: Cannot make a static reference to the non-static method readFile() from the type SystemandDesign.BinaryTree.BinaryTree
File: C:\Users\Carlos Satres\Documents\SystemandDesign\BinaryTree\Binary Tree.java [line: 78]
Error: Cannot make a static reference to the non-static method closeFile() from the type SystemandDesign.BinaryTree.BinaryTree
--------------
** Warnings **
--------------
File: C:\Users\Carlos Satres\Documents\SystemandDesign\BinaryTree\Binary Tree.java [line: 11]
Warning: java.util.List is a raw type. References to generic type java.util.List<E> should be parameterized
File: C:\Users\Carlos Satres\Documents\SystemandDesign\BinaryTree\Binary Tree.java [line: 11]
Warning: The field SystemandDesign.BinaryTree.BinaryTree.list is never read locally
File: C:\Users\Carlos Satres\Documents\SystemandDesign\BinaryTree\Binary Tree.java [line: 90]
Warning: Type safety: Unchecked cast from java.lang.Object to java.util.List<java.lang.Integer>

Current errors with the code as is x.x