Integer.bitCount counts the number of one-bits in the two's complement binary representation of the specified int value. Example code: public class CountOnes { public static void... For long , there's Long.bitCount()

Some methods to convert int to String in Java: String concatenation String s = "" + 1234; Using Integer object String s = Integer.toString(1234); Using String object String s = String.valueOf(1234);

Some methods to convert Java String to int: To primitive int: int i = Integer.parseInt("11111"); To Integer object: Integer i = new Integer("1234"); // to prim... To Integer object: Integer i = Integer.valueOf("44321");

Some methods to create an array in Java: With literal initialization. // array of strings String[] dogs = { "Chihuah... With array constructor (array allocated by not the elements). // create a byte array byte[] buffer = new byte... Anonymous array to be used as a parameter in method invocation String.format("Hello %s, %s, %s!", new Object[] { ...

public class TestInnerClass { private stati...

It's a lot easier to use swing JOptionPane to present a dialog. But if plain awt is what you want, this is the code. A Dialog is a Window object, so you paint it just like you would for a window. import java.awt.*; import java.awt.event.*; ...

This example captures the screen of the current Java application window, instead of the full screen. import java.io.*; import java.awt.*; import ...

import java.awt.Graphics; import java.awt.event...

You can use the javax.xml.transform.Transformer class to "transform" an XML stream (string in this case) to a DOM tree - effectively parsing the XML string. import java.io.*; import javax.xml.transform.Tr...

Use javax.xml.parsers.DocumentBuilder to parse xml. DocumentBuilder.parse() takes: java.io.File org.xml.sax.InputSource java.io.InputStream java.lang.String as a URI to an XML document Example code: import java.io.*; import javax.xml.parsers.Docu...