Free Java Advanced Theory Notes For Beginners1

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Introduction to Java Swings`

Java swing short explanation-Difference between AWT and Swing Java Swing Java swing is a part of Java Foundation Classes( JFC ) and is used to create various applications. Swing is an API for providing a graphical user interface ( GUI ) for Java programs. It offers much-improved functionality over AWT .Swing components requires javax.swing package. What is JFC? JFC is the set of GUI components that simplify desktop Applications. Features Of Swing Class Pluggable look and feel. Uses MVC architecture. Lightweight Components. Platform Independent. Swing controls can be customized in a very easy way as visual appearance is independent of internal representation. Swing provides a rich set of advanced controls like Tree TabbedPane, slider, colorpicker, and table controls. Acronyms to remember in Java programming: GUI stands for G raphical U ser I nterface API stands for A pplication P rogram I nterface AWT stands for A bstract W indow T oolkit MVC stands ...

Java AWT Controls-part 4

Java simple theory notes for AWT controls part4 Easy and tasty Christmas cake recipes TextField Control TextField control holds a single line of text that can be edited.Hence, this control is called editable control. The TextField control is a Sub-Class of the TextComponent class.It can be created using the following constructors: TextField test1=new TextField() ; TextField test2=new TextField(int); TextField test3=new TextField(String); TextField test4=new TextField(String,int); Here test1,test2,test3 and test4 are the object name, the programmer can give the desired name as the object name. The first and third constructors create the default TextField . The Second and fourth creates a TextField of size specified by the number of characters. The text field control has the methods getText() and set Text(String) for getting and setting the values in the text field. The text field can be made editable or non-editable by using the following methods: SetEditable...

AWT control fundamentals in java-part 3

AWT components in java Choice control The choice control contains a list of choices from which one can be selected. When it is inactive it takes the same Space as that of a single choice. Choice has only one default constructor, namely: Choice choice1 = new Choice(); Here choice1 is the object name, the programmer can give the desired name as the object name. To add items to the choice created in the above statement, The following method can be used. choice1.addltem(String); choice1.add(String); To get the selected item, the method getSelected Item() is used and the index of the Selected item can be obtained using the method get selectedindex(). Items can also be selected using Select( int index) and Select (String name) when either the index or the name of the item is Known. List control. The list control is similar to the choice control, but multiple items can be selected using the list control.Here the number rows to be visible in the list can be specified, Whereas in the choic...

AWT controls in Java-part 2

Java simple theory notes for AWT controls part2 java AWT CheckBox A check box is a graphical component that can be in either an "on" (true) or "off" (false) state. Clicking on a check box changes its state from "on" to "off," or from "off" to "on." In other words, the checkbox control is used to select or deselect different options.These control also have a label associated with them which describe the option of the checkbox. How to create a label? syntax for creating labels: Checkbox cbox1=new Checkbox(); Checkbox cbox2=new Checkbox(String); Checkbox cbox3=new Checkbox(String,boolean); Here cbox1,cbox2,cbox3 are the object name, the programmer can give the desired name as the object name. Given above are three types of constructor for the checkbox The first one creates a blank default checkbox.The label for checkbox can be set using the setLabel() method The second constructor creates a checkbox with the specified labe...

AWT controls in Java-Beginners note-part 1

Java simple theory notes for AWT controls part1 AWT controls ( java AWT ) Controls are components that allow the user to interact with an application. `A component is a visual object containing text or graphics.It can respond to keyboard or mouse input.The java AWT supports several types of control.These are listed below: Labels Buttons Lists Radio Buttons Scroll Bars Text Field Choice Lists Text Area Check Boxes Labels Labels are used to present some type of interactive information on a container.These will not interact with the user and do not fire any event.so, there is no Listener class for the labels.Labels are used for display purpose only.A Container is a graphical object that contains component or container. How to create a label? syntax for creating labels: Label label1=new Label(); Label label2=new Label(String); Label label3=new Label(String,int); Here label1,label2,label3 is the object name, the programmer can give the desired name as the object name. Given abov...

Java coding questions and answers

Advanced java coding questions and answers for practice 1. What is the purpose of the java.util.stream package in Java, and how does it support functional-style operations on collections? Answer: The java.util.stream package provides a powerful API for functional-style operations on collections, including filtering, mapping, and reducing, making it easier to work with data in a declarative manner. 2. Explain the concept of serialization and deserialization in Java, and discuss the role of the Serializable interface? Answer: Serialization is the process of converting an object into a byte stream for storage or transmission, while deserialization is the reverse process. The Serializable interface is used to mark classes as serializable, allowing their objects to be serialized. 3. What is the java.util.function package in Java, and how does it provide functional interfaces for use with lambda expressions and method references? Answer: The java.util.function package defines functi...