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wrapper classes in Java

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Describe the wrapper classes in Java. Wrapper class is wrapper around a primitive data type. An instance of a wrapper class contains, or wra...

Java Class as Applet as well as Application

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Can you write a Java class that could be used both as an applet as well as an application? A. Yes. Add a main() method to the applet.

Bring JFrame JDialog Window to front java swing

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To bring JFrame or JDialog ... or Window (JFrame and JDialog inherits Window)   to front in JAVA, fun the code below : java.awt.EventQueue...

Redirect Standard System Output and Error Message to PrintStream in Java

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In a Java program, how can you divert standard system output or error messages, say to a file? ->We can achieve this by using public st...

concatenate arrays of any type - java

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Combining two arrays of any type public static T[] concat(T[] first, T[] second) { T[] result = Arrays.copyOf(first, first.length + se...

difference between an interface and an abstract class

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What's the difference between an interface and an abstract class? Also discuss the similarities.  (Very Important) Abstract class is a ...

Adding image to JPanel Java

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Adding Image to JPanel BufferedImage myPicture = ImageIO.read(new File("path-to-file")); JLabel picLabel = new JLabel(new ImageI...

Read time from internet time server - working java code

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Read time from internet time server - working java code import java.io.*; import java.net.*; import java.util.*; /** * This program makes...

iterate through map hashmap linkedhashmap in java

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How to iterate through Map.. MashMap, LinkedHashMap ...  in Java Method 1 : If you're only interested in the keys, you can iterate thr...

java escape text in regular expression

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Java's a built-in way to escape arbitrary text so that it can be included in a regular expression- For example, users enter "$5...