Is there a Java API for Tree data structure?
Hi,
I am wondering is there any Java API to work on Tree based data structure.
I could read in some forums / sites that teach me how to create tree based objects using collection.
But I wanted to know is there any core java API that can be used directly for tree based operations. (like binary tree or other type of trees)
Please comment on this doubt.
Headed using google and other stuff not found one.
Suggestion: Why not start building the one, its a good idea to do that, isn't it.
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Any Java API for dumping database?
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Hi all !
Currently I�m developing a Java software that requires a Tree data structure. Searching through Java API I�ve found classes like TreeMap and TreeSet, but although these classes seens to use tree structure behind what they really provide are linear data structure, not a tree data structure. My question is if there is a public and free Java tree data structure that permits to do activities such as:
- Search for a particular node (efficiently)
- Insert children to any node
- Maintain one Object in each node
Simple like this ! It must have something like this in Java, but I just can�t find it and I�m just too lazy to implement it :) ! Anyone can help me ?
Thanks in advance !Mel,
I�ve seen javax.swing.tree.TreeModel and its seens more like an implementation of Control in swing MVC (Model Vision Control) swing paradigm for JTree. It has listeners generated for manipulation events for example. It uses javax.swing.tree.DefaultMutableTreeNode for its nodes, and maybe I could use this class for the nodes of my tree since it has many useful operations. However still I miss a node searching operation that this class doesn�t have.
Yes my problem is a simple Tree, but it is simple now and it might become much more complex, demanding more operations on the tree and specially efficient searching algorithms. Thats why I�m looking for a complete solution and I prefer something that is already done and well tested :) !
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What Tree Data Structures does Java Include?
Hello,
I have been reading about several tree data structures like a binary search tree, self-balancing bst, minimum spanning tree, red-black tree, AVL tree, etc... Are there data structures in Java represent the various trees, or is implementation of the ds left to user?
Eric"Java" can be termed the "Java Language". The language does not have trees.
In more general usage "Java" can refer to a standard, desktop, delivered VM which includes the standard Java API. The types that you are asking about would be found in the following package.
[http://java.sun.com/javase/6/docs/api/java/util/package-summary.html]
"Java" could also refer to any other commonly available implementations. In that case probably anything that can be implemented has been implemented somewhere. Googling works. -
Java API for running entire ".sql" files on a remote DB ( mySQL or Oracle)?
Hi,
Would anyone happen to know if there's a java API for executing entire ".sql" files (containing several different SQL commands), on a remote database server ?
It's enough if the API works with MySQL and/or Oracle.
Just to demonstrate what i'm looking for:
Suppose you've created sql file "c:/test.sql" with several script lines:
-- test.sql:
insert into TABLE1 values(3,3);
insert into TABLE1 values(5,5);
create table TABLE2 (name VARCHER) ENGINE innoDB; -- MYSQL specific
Then the java API should look something like:
// Dummy java code:
String driver="com.mysql.jdbc.Driver";
String url= "jdbc:mysql://localhost:3306/myDb";
SomeAPI.executeScriptFile( "c:/test.sql", driver, url);
Thanks.No such a API, but it's easy to parse all sqls in a file, then run those command:
For instance:
import java.sql.*;
import java.util.Properties;
/* A demo show how to load some sql statements. */
public class testSQL {
private final static Object[] getSQLStatements(java.util.Vector v) {
Object[] statements = new Object[v.size()];
Object temp;
for (int i = 0; i < v.size(); i++) {
temp = v.elementAt(i);
if (temp instanceof java.util.Vector)
statements[i] = getSQLStatements( (java.util.Vector) temp);
else
statements[i] = temp;
return statements;
public final static Object[] getSQLStatements(String sqlFile) throws java.
io.IOException {
java.util.Vector v = new java.util.Vector(1000);
try {
java.io.BufferedReader br = new java.io.BufferedReader(new java.io.
FileReader(sqlFile));
java.util.Vector batchs = new java.util.Vector(10);
String temp;
while ( (temp = br.readLine()) != null) {
temp = temp.trim();
if (temp.length() == 0)
continue;
switch (temp.charAt(0)) {
case '*':
case '"':
case '\'':
// System.out.println(temp);
break; //Ignore any line which begin with the above character
case '#': //Used to begin a new sql statement
if (batchs.size() > 0) {
v.addElement(getSQLStatements(batchs));
batchs.removeAllElements();
break;
case 'S':
case 's':
case '?':
if (batchs.size() > 0) {
v.addElement(getSQLStatements(batchs));
batchs.removeAllElements();
v.addElement(temp);
break;
case '!': //Use it to get a large number of simple update statements
if (batchs.size() > 0) {
v.addElement(getSQLStatements(batchs));
batchs.removeAllElements();
String part1 = temp.substring(1);
String part2 = br.readLine();
for (int i = -2890; i < 1388; i += 39)
batchs.addElement(part1 + i + part2);
for (int i = 1890; i < 2388; i += 53) {
batchs.addElement(part1 + i + part2);
batchs.addElement(part1 + i + part2);
for (int i = 4320; i > 4268; i--) {
batchs.addElement(part1 + i + part2);
batchs.addElement(part1 + i + part2);
for (int i = 9389; i > 7388; i -= 83)
batchs.addElement(part1 + i + part2);
v.addElement(getSQLStatements(batchs));
batchs.removeAllElements();
break;
default:
batchs.addElement(temp);
break;
if (batchs.size() > 0) {
v.addElement(getSQLStatements(batchs));
batchs.removeAllElements();
br.close();
br = null;
catch (java.io.FileNotFoundException fnfe) {
v.addElement(sqlFile); //sqlFile is a sql command, not a file Name
Object[] statements = new Object[v.size()];
for (int i = 0; i < v.size(); i++)
statements[i] = v.elementAt(i);
return statements;
public static void main(String argv[]) {
try {
String url;
Object[] statements;
switch (argv.length) {
case 0: //Use it for the simplest test
case 1:
url = "jdbc:dbf:/.";
if (argv.length == 0) {
statements = new String[1];
statements[0] = "select * from test";
else
statements = argv;
break;
case 2:
url = argv[0];
statements = getSQLStatements(argv[1]);
break;
default:
throw new Exception(
"Syntax Error: java testSQL url sqlfile");
Class.forName("com.hxtt.sql.dbf.DBFDriver").newInstance();
//Please see Connecting to the Database section of Chapter 2. Installation in Development Document
Properties properties = new Properties();
Connection con = DriverManager.getConnection(url, properties);
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
//Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
// stmt.setMaxRows(0);
stmt.setFetchSize(10);
final boolean serializeFlag = false;//A test switch to serialize/deserialize the resultSet
ResultSet rs;
for (int i = 0; i < statements.length; i++) {
if (statements[i] instanceof java.lang.String) {
String temp = (java.lang.String) statements;
switch (temp.charAt(0)) {
case 'S':
case 's':
case '?':
System.out.println(temp);
rs = stmt.executeQuery(temp);
if (serializeFlag) {
// serialize the resultSet
try {
java.io.FileOutputStream fileOutputStream = new
java.io.FileOutputStream("testrs.tmp");
java.io.ObjectOutputStream
objectOutputStream = new java.io.
ObjectOutputStream(fileOutputStream);
objectOutputStream.writeObject(rs);
objectOutputStream.flush();
objectOutputStream.close();
fileOutputStream.close();
catch (Exception e) {
System.out.println(e);
e.printStackTrace();
System.exit(1);
rs.close(); //Let the CONCUR_UPDATABLE resultSet release its open files at once.
rs = null;
// deserialize the resultSet
try {
java.io.FileInputStream fileInputStream = new
java.io.FileInputStream("testrs.tmp");
java.io.ObjectInputStream objectInputStream = new
java.io.ObjectInputStream(
fileInputStream);
rs = (ResultSet) objectInputStream.
readObject();
objectInputStream.close();
fileInputStream.close();
catch (Exception e) {
System.out.println(e);
e.printStackTrace();
System.exit(1);
ResultSetMetaData resultSetMetaData = rs.
getMetaData();
int iNumCols = resultSetMetaData.getColumnCount();
for (int j = 1; j <= iNumCols; j++) {
// System.out.println(resultSetMetaData.getColumnName(j));
/* System.out.println(resultSetMetaData.getColumnType(j));
System.out.println(resultSetMetaData.getColumnDisplaySize(j));
System.out.println(resultSetMetaData.getPrecision(j));
System.out.println(resultSetMetaData.getScale(j));
System.out.println(resultSetMetaData.
getColumnLabel(j)
+ " " +
resultSetMetaData.getColumnTypeName(j));
Object colval;
rs.beforeFirst();
long ncount = 0;
while (rs.next()) {
// System.out.print(rs.rowDeleted()+" ");
ncount++;
for (int j = 1; j <= iNumCols; j++) {
colval = rs.getObject(j);
System.out.print(colval + " ");
System.out.println();
rs.close(); //Let the resultSet release its open tables at once.
rs = null;
System.out.println(
"The total row number of resultset: " + ncount);
System.out.println();
break;
default:
int updateCount = stmt.executeUpdate(temp);
System.out.println(temp + " : " + updateCount);
System.out.println();
else if (statements[i] instanceof java.lang.Object[]) {
int[] updateCounts;
Object[] temp = (java.lang.Object[]) statements[i];
try {
for (int j = 0; j < temp.length; j++){
System.out.println( temp[j]);
stmt.addBatch( (java.lang.String) temp[j]);
updateCounts = stmt.executeBatch();
for (int j = 0; j < temp.length; j++)
System.out.println((j+1)+":"+temp[j]);
for (int j = 0; j < updateCounts.length; j++)
System.out.println((j+1)+":" +updateCounts[j]);
catch (java.sql.BatchUpdateException e) {
updateCounts = e.getUpdateCounts();
for (int j = 0; j < updateCounts.length; j++)
System.out.println((j+1)+":"+updateCounts[j]);
java.sql.SQLException sqle = e;
do {
System.out.println(sqle.getMessage());
System.out.println("Error Code:" +
sqle.getErrorCode());
System.out.println("SQL State:" + sqle.getSQLState());
sqle.printStackTrace();
while ( (sqle = sqle.getNextException()) != null);
catch (java.sql.SQLException sqle) {
do {
System.out.println(sqle.getMessage());
System.out.println("Error Code:" +
sqle.getErrorCode());
System.out.println("SQL State:" + sqle.getSQLState());
sqle.printStackTrace();
while ( (sqle = sqle.getNextException()) != null);
stmt.clearBatch();
System.out.println();
stmt.close();
con.close();
catch (SQLException sqle) {
do {
System.out.println(sqle.getMessage());
System.out.println("Error Code:" + sqle.getErrorCode());
System.out.println("SQL State:" + sqle.getSQLState());
sqle.printStackTrace();
while ( (sqle = sqle.getNextException()) != null);
catch (Exception e) {
System.out.println(e.getMessage());
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Hi,
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Best regards,
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Follow below steps.
Yes you can get it from service market place.
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