Java GUI Basic 1

1. JAVA GUI
JRadioButton Example:

public class someClass extends JFrame{

      JTextField tf;

      Font pf;

      Font bf;

      Font itf;

      Font bif;

      JRadioButton pb;

      JRadioButton bb;

      JRadioButton ib;

      JRadioButton bib;

      ButtonGroup group;

     

      public someClass(){

            super("The Title");

            setLayout(new FlowLayout());

            tf = new JTextField("Bucky is awesome and hot", 25);

            add(tf);

            pb = new JRadioButton("plain",true);

            bb = new JRadioButton("bold", false);

            ib = new JRadioButton("italic", false);

            bib = new JRadioButton("bold and italic", false);

            add(pb);

            add(bb);

            add(ib);

            add(bib);

           

            group = new ButtonGroup();

            group.add(pb);

            group.add(bb);

            group.add(ib);

            group.add(bib);

           

            pf = new Font("Serif", Font.PLAIN, 14);

            bf = new Font("Serif", Font.BOLD, 14);

            itf = new Font("Serif", Font.ITALIC, 14);

            bif = new Font("Serif", Font.BOLD + Font.ITALIC, 14);

           

            tf.setFont(pf);

            pb.addItemListener(new HandlerClass(pf));

            bb.addItemListener(new HandlerClass(bf));

            ib.addItemListener(new HandlerClass(itf));

            bib.addItemListener(new HandlerClass(bif));

      }

     

      class HandlerClass implements ItemListener{

            Font font;

           

            public HandlerClass(Font f){

                  font = f;

            }

            @Override

            public void itemStateChanged(ItemEvent arg0) {

                  // TODO Auto-generated method stub

                  tf.setFont(font);

            }

           

      }

     

}

mainClass:

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            someClass sc = new someClass();

            sc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            sc.setSize(300, 200);

            sc.setVisible(true);

      }

Result:

JList Example:

public class someClass extends JFrame{

      JList list;

      static String[] colornames = {"black", "blue", "red", "white"};

      static Color[] colors = {Color.BLACK, Color.BLUE, Color.RED, Color.WHITE};

      public someClass(){

            super("Title");

            setLayout(new FlowLayout());

            list = new JList(colornames);

            list.setVisibleRowCount(4);

            list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

            add(new JScrollPane(list));

           

            list.addListSelectionListener(new ListSelectionListener() {

                 

                  @Override

                  public void valueChanged(ListSelectionEvent arg0) {

                        // TODO Auto-generated method stub

                        getContentPane().setBackground(colors[list.getSelectedIndex()]);

                  }

            });

      }

}

Result:

Multiple Selection List Example:

public class someClass extends JFrame{

      JList leftlist;

      JList rightlist;

      JButton movebutton;

     

      static String[] food = {"bacon", "wings", "ham", "beef", "orange","banana"};

     

      public someClass(){

            super("Title");

            setLayout(new FlowLayout());

           

            leftlist = new JList(food);

            leftlist.setVisibleRowCount(4);

leftlist.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

            add(new JScrollPane(leftlist));

            movebutton = new JButton("Move--->");

            movebutton.addActionListener(new ActionListener() {

                 

                  @Override

                  public void actionPerformed(ActionEvent arg0) {

                        // TODO Auto-generated method stub

                        rightlist.setListData(leftlist.getSelectedValues());

                  }

            });

           

            add(movebutton);

            rightlist = new JList();

            rightlist.setVisibleRowCount(3);

            rightlist.setFixedCellWidth(100);

            rightlist.setFixedCellHeight(15);

rightlist.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

            add(new JScrollPane(rightlist));

           

      }

}

Result:

Simple Adapter Class Example

MouseAdapter Class:

public class Gui extends JFrame {

      private String details;

      private JLabel statusbar;

     

      public Gui(){

            super("Title");

           

            statusbar = new JLabel("This is default");

            add(statusbar, BorderLayout.SOUTH);

            addMouseListener(new MouseClass());

      }

     

      private class MouseClass extends MouseAdapter{

            public void mouseClicked(MouseEvent ev){

            details = String.format("You clicked %d", ev.getClickCount());

                  if(ev.isMetaDown())

                        details +=" with right mouse button";

                  else if(ev.isAltDown())

                        details +=" either center mouse button";

                  else details +=" with left mouse button";

                 

                  statusbar.setText(details);  

            }

      }

}

Main class:

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            Gui go = new Gui();

            go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            go.setSize(300, 200);

            go.setVisible(true);

      }

Result:

FlowLayout:

public class someClass extends JFrame{

      JButton a;

      JButton b;

      JButton c;

      FlowLayout layout;

      Container cont;

     

      public someClass(){

            super("Layout tutorial");

            layout = new FlowLayout();

            cont = getContentPane();

            setLayout(layout);

            a = new JButton("Left");

            add(a);

            a.addActionListener(new ActionListener() {

                 

                  @Override

                  public void actionPerformed(ActionEvent arg0) {

                        // TODO Auto-generated method stub

                        layout.setAlignment(FlowLayout.LEFT);

                        layout.layoutContainer(cont);

                  }

            });

            // center

            b = new JButton("Center");

            add(b);

            b.addActionListener(new ActionListener() {

                 

                  @Override

                  public void actionPerformed(ActionEvent arg0) {

                        // TODO Auto-generated method stub

                        layout.setAlignment(FlowLayout.CENTER);

                        layout.layoutContainer(cont);

                  }

            });

            // right

            c = new JButton("Right");

            add(c);

            c.addActionListener(new ActionListener() {

                 

                  @Override

                  public void actionPerformed(ActionEvent arg0) {

                        // TODO Auto-generated method stub

                        layout.setAlignment(FlowLayout.RIGHT);

                        layout.layoutContainer(cont);

                  }

            });

      }

     

}

Main class:

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            someClass sc = new someClass();

            sc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            sc.setSize(300, 100);

            sc.setVisible(true);

      }

Drawing Graphics:

public class someClass extends JPanel{

      public void paintComponent(Graphics g){

            super.paintComponent(g);

            this.setBackground(Color.WHITE);

            g.setColor(Color.WHITE);

            g.drawLine(10, 25, 200, 45);

            g.setColor(Color.RED);

            g.drawRect(10, 55, 100, 30);

            g.setColor(Color.GREEN);

            g.fillOval(10, 95, 100, 30);

            g.setColor(Color.ORANGE);

            g.fill3DRect(10, 160, 100, 50, true);

            g.setColor(Color.BLACK);

            g.drawString("This is string", 15, 150);

           

      }

}

Main class:

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            JFrame jf = new JFrame("Title");

            jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            someClass sc = new someClass();

            sc.setBackground(Color.WHITE);

            jf.add(sc);

            jf.setSize(500, 300);

            jf.setVisible(true);

      }

Result:

Java Basic 1

1. Variable Length Arguments:
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(avg(5,2,3,5,6,7));
System.out.println(avg(10,11,21,33));

}

public static int avg(int...numbers){
int t = 0;
for(int x: numbers)
t+=x;
return t/numbers.length;
}

2. Enumeration and EnumSet range:
public enum someClass {
bucky("nice", "22"),
kelsey("cutie", "10"),
julia("bigmistake", "12"),
bataa("cool","25"),
azaa("good", "15");

final String desc;
final String year;

someClass(String de, String b){
desc = de;
year = b;
}
public String getDesc(){
return desc;
}
public String getYear(){
return year;
}

}

mainclass:
public static void main(String[] args) {
// TODO Auto-generated method stub

for(someClass c: EnumSet.range(someClass.kelsey, someClass.bataa))
//for(someClass c: someClass.values())

System.out.printf("%s\t%s\t%s\n", c, c.desc, c.year);

}
3. Static Example:
public class someClass {
String fname;
String lname;
static int members=0;

someClass(String f, String l){
fname = f;
lname = l;
members++;
System.out.printf("\nNew Member firstname: %s, lastname: %s, Id: %d", fname, lname, members);
}
public String getFname(){
return fname;
}
public String getLname(){
return lname;
}
public int getMembers(){
return members;
}
}

mainClass:
public static void main(String[] args) {
// TODO Auto-generated method stub
someClass sc1 = new someClass("Carmelo", "Anthony");
someClass sc2 = new someClass("Lebron", "James");
someClass sc3 = new someClass("Chris", "Paul");

System.out.println("\n" + sc1.getMembers());

}

Array Holding Many Objects:
 public class someClassList {

     

      someClass[] sc = new someClass[5];

      int i = 0;

     

      public void add(someClass s){

            if(i<sc.length)

            {

                  sc[i] = s;

                  System.out.println("some class added by index: " + i);

                  i++;

                  }

            }

}

B.  public class OtherClass extends someClass{

}

C.  public class someClass{

}    

Main class:

public class func1{

     

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            someClassList scl = new someClassList();

            OtherClass os = new OtherClass();

            someClass sc = new someClass();

            scl.add(os);

            scl.add(sc);

           

      }

}

Simple Polymorphic:

public class someClass{

     

      public void noise(){

            System.out.println("Base class noise");

      }

}

public class OtherClass extends someClass{

      public void noise(){

            System.out.println("OtherCLass noise");

      }

}

Main Class:

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            OtherClass os = new OtherClass();

            os.noise();

            someClass sc = new someClass();

            sc.noise();

      }

File

Creating Files:

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            final Formatter x;

            try{

                  x = new Formatter("javatutorial.txt");

                  System.out.println("You created a file!");

                 

            }catch(Exception ex){

                  System.out.println(ex.getMessage());

            }

      }

Writing to Files:

public class someClass{

     

      private Formatter x;

      public void openFile(){

            try{

                  x = new Formatter("javaa.txt");    

            } catch (Exception ex){

                  System.out.println(ex.getMessage());

            }

      }

      public void addRecords(){

            x.format("%s%s%s", "15", "Carmelo", "Anthony");

      }

      public void closeFile(){

            x.close();

      }

}

Main class:

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            someClass sc = new someClass();

            sc.openFile();

            sc.addRecords();

            sc.closeFile();

      }

Reading to Files:

 public class someClass{

      private Scanner x;

     

      public void openFile(){

            try{

                  x = new Scanner(new File("javaa.txt"));

            } catch (Exception ex){

                  System.out.println(ex.getMessage());

            }

      }

     

      public void readFile(){

            String a, b, c;

            while(x.hasNext()){

                  a = x.next();

                  b = x.next();

                  c = x.next();

                  System.out.printf("%s %s %s\n", a, b, c);

            }

      }

     

      public void closeFile(){

            x.close();

      }

}

Main class:

      public static void main(String[] args) {

            // TODO Auto-generated method stub

            someClass sc = new someClass();

            sc.openFile();

            sc.readFile();

            sc.closeFile();

      } 

Видео линк:https://www.youtube.com/playlist?list=PLFE2CE09D83EE3E28