How to know whether a method is thread-safe through the java-doc?

In some book, it says that SAXParserFactory.newSAXParser() is thread-safe,but in the java-doc,it doesn't say that.
newSAXParser
public abstract SAXParser newSAXParser()
throws ParserConfigurationException,
SAXExceptionCreates a new instance of a SAXParser using the currently configured factory parameters.
Returns:
A new instance of a SAXParser.
Throws:
ParserConfigurationException - if a parser cannot be created which satisfies the requested configuration.
SAXException - for SAX errors.
I want to know, how to know whether a method is thread-safe?

System.out is a PrintStream object. None of the methods there use the synchronized modifier, but if you look in the source code, you will find out it is thread-safe, because it will use synchronized blocks whenever it writes some text.
The source code is in the src.jar file which you can extract.
I didn't find any comments about that PrintStream is thread-safe in the API.

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How can I get to know if a method is threads-safe?

Hi, there.
How can I get to know if a method is threads-safe?
For example, in two different threads, is System.out.print() method safe or not?And where can I find the information with regard to this?
thanks very much.

System.out is a PrintStream object. None of the methods there use the synchronized modifier, but if you look in the source code, you will find out it is thread-safe, because it will use synchronized blocks whenever it writes some text.
The source code is in the src.jar file which you can extract.
I didn't find any comments about that PrintStream is thread-safe in the API.

Anyone knows whether this method will work?

Hi,
I am trying out this method to construct an applet but I couldn't get it to work.Does anyone here know whether this method will work and how to debug it.Thanks.
import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
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private Button circle, square;
private Model aModelInstance;
public void init() {
circle = new Button("Circle");
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g.fillOval(145,89,122,122);
private aModelInstance.display(g)
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g.setColor(Color.green);
g.fillRect(145,89,122,122);
public void display(Graphics g) {
}

It will work for the most part put there is a few problems that you would have to work out. Most of the problems are in the inner class Model. I commented out a couple of lines in there that did not make sense. In the getSquare() & getCircle() methods you are referring to the variable 'g' where there was no declaration for that variable, in Model. So I modifed the method to have an input parameter of Graphics, that will need to be passed to the method. Then I modified the code in Project so that it passes Graphics when it calls those methods.
The code now compiles cleanly but there is still some work for you to do. You should modify the getSquare() and getCircle() methods to return the Graphics. Then in the actionPerformed() method, call the paint method with the returned Graphics. Good luck.
import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
public class Project extends Applet implements ActionListener {
private Button circle, square;
private Model aModelInstance;
public void init() {
circle = new Button("Circle");
add(circle);
circle.addActionListener(this);
square = new Button("Square");
add(square);
square.addActionListener(this);
aModelInstance = new Model();
public void paint(Graphics g) {
aModelInstance.display(g);
public void actionPerformed(ActionEvent event) {
if (event.getSource() == circle)
aModelInstance.getCircle(this.getGraphics());
if (event.getSource() == square)
aModelInstance.getSquare(this.getGraphics());
repaint();
class Model {
//private aModelInstance.display(g)
public void getCircle(Graphics g) {
g.setColor(Color.red);
g.fillOval(145,89,122,122);
//private aModelInstance.display(g)
public void getSquare(Graphics g) {
g.setColor(Color.green);
g.fillRect(145,89,122,122);
public void display(Graphics g) {
}

How to know whether balance carry forward has happened or not

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Message was edited by:
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How to know whether a method is thread-safe through the java-doc?

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