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Technical Notes
Programming and other technical stuff
Wednesday, August 17, 2011
Using SWT/JFace in Eclipse
To be able to use SWT and JFace in Eclipse, a few jar files need to be included in the Build Path.
You can access the Java Build Path from the project properties.
Sunday, August 7, 2011
Measuring Python code execution time
import time
timestart = time.time()
# code to measure here
print time.time() - timestart, "seconds"
You can also try time.clock(). It is said to be more accurate.
timestart = time.time()
# code to measure here
print time.time() - timestart, "seconds"
You can also try time.clock(). It is said to be more accurate.
Monday, July 11, 2011
Java String to number conversion
This entry is from http://www.devdaily.com/java/edu/qanda/pjqa00008.shtml
Two ways to convert number to String
Method 1: using String.valueOf()
String s = String.valueOf(i);
String s = String.valueOf(f); // float
String s = String.valueOf(d); // double
String s = String.valueOf(l); // long
Method 2: using toString() method of the numeric classes
String s = new Integer(i).toString(); // or Integer.toString(i)
String s = new Float(f).toString();
String s = new Double(d).toString();
String s = new Long(l).toString();
Convert String to number:
int anInt = Integer.parseInt("17");
double aDouble = Double.parseDouble("17");
NOTE: The methods above are not exhaustive. Googling will surely yield a few more ways to do conversion.
Two ways to convert number to String
Method 1: using String.valueOf()
String s = String.valueOf(i);
String s = String.valueOf(f); // float
String s = String.valueOf(d); // double
String s = String.valueOf(l); // long
Method 2: using toString() method of the numeric classes
String s = new Integer(i).toString(); // or Integer.toString(i)
String s = new Float(f).toString();
String s = new Double(d).toString();
String s = new Long(l).toString();
Convert String to number:
int anInt = Integer.parseInt("17");
double aDouble = Double.parseDouble("17");
NOTE: The methods above are not exhaustive. Googling will surely yield a few more ways to do conversion.
Accessing instance variable in Python
To access a Python instance variable outside the class:
class Sample:
def __init__(self, max):
self. max = max
....
sampleinstance = Sample(2)
max = sampleinstance.max
class Sample:
def __init__(self, max):
self. max = max
....
sampleinstance = Sample(2)
max = sampleinstance.max
Wednesday, July 6, 2011
Java String <-> int conversion
To convert String to int:
Integer.parseInt("17");
To convert int to String:
Integer.toString(17);
Integer.parseInt("17");
To convert int to String:
Integer.toString(17);
Swing JComboBox usage - Getting the text of the selected item
Here is an example of a function handling an ActionPerformed event on a Combo Box.
private void onCategoryChanged(ActionEvent ae){
JComboBox cbCategory = (JComboBox)ae.getSource();
System.out.println(cbCategory.getSelectedIndex()); // Display the item index, 1st item index is 0
System.out.println((String)cbCategory.getSelectedItem()); // Display the string of the selected item
}
private void onCategoryChanged(ActionEvent ae){
JComboBox cbCategory = (JComboBox)ae.getSource();
System.out.println(cbCategory.getSelectedIndex()); // Display the item index, 1st item index is 0
System.out.println((String)cbCategory.getSelectedItem()); // Display the string of the selected item
}
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