polymorphism

Author: amartid

src/Polymorphism2/e56Polymorphism.java

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+package Polymorphism2;
+
+import javax.swing.*;
+
+//assume that pacman eats food like cherries, bananas, strawberries
+//superclass is Polymorphism1.pacFood
+//cherries, bananas, strawberries inherit all methods and variables on food class - subclasses
+public class e56Polymorphism extends JFrame{
+    public static void main(String [] args){
+        pacman mypacman = new pacman();
+        pacFood fo = new pacFood();
+        pacFood so = new pacStrawnerrie();
+        mypacman.digest(fo);
+        mypacman.digest(so);
+    }
+}

src/Polymorphism2/pacBanana.java

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+package Polymorphism2;
+
+public class pacBanana extends pacFood {
+	public void eat() {
+
+		System.out.println("This Banana is great");
+	}
+}

src/Polymorphism2/pacCherry.java

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+package Polymorphism2;
+
+public class pacCherry extends pacFood {
+	public void eat() {
+
+		System.out.println("This Cherry is great");
+	}
+}

src/Polymorphism2/pacFood.java

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+package Polymorphism2;
+
+public class pacFood {
+	public void eat() {
+
+		System.out.println("This food is great");
+	}
+}

src/Polymorphism2/pacStrawnerrie.java

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+package Polymorphism2;
+
+public class pacStrawnerrie extends pacFood {
+	public void eat() {
+
+		System.out.println("This Strawberry is great");
+	}
+}

src/duna8.java

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+import java.awt.FlowLayout;
+import javax.swing.JFrame; //basic window
+import javax.swing.JLabel; //output text and images on the screen
+
+public class duna8 extends JFrame{
+        private JLabel item1;
+
+        public duna8(){
+            super("The title bar");
+            setLayout(new FlowLayout());
+            item1 = new JLabel("This is a sentence");
+            item1.setToolTipText("This is gonna show up on hover");
+            add(item1);
+        }
+}

src/duna9.java

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+import java.awt.FlowLayout;
+import java.awt.event.ActionListener;
+import java.awt.event.ActionEvent;
+import javax.swing.JFrame; //basic window
+import javax.swing.JTextField;
+import javax.swing.JPasswordField;
+import javax.swing.JOptionPane;
+public class duna9 extends JFrame{
+    private JTextField item1;
+    private JTextField item2;
+    private JTextField item3;
+    private JPasswordField passwordField;
+    public duna9(){
+        super("The title");
+        setLayout(new FlowLayout());
+        item1 = new JTextField(10);
+        add(item1);
+
+        item2 = new JTextField("Enter text here :");
+        add(item2);
+
+        item3 = new JTextField("uneditable",20);
+        item3.setEditable(false);
+        add(item3);
+
+        passwordField = new JPasswordField("mypass");
+        add(passwordField);
+
+        thehandler handler = new thehandler();
+        item1.addActionListener(handler);
+        item2.addActionListener(handler);
+        item3.addActionListener(handler);
+        passwordField.addActionListener(handler);
+    }
+    //methods is gonna be called whenever an event occurs
+    private  class  thehandler implements ActionListener{
+        public void actionPerformed(ActionEvent event){
+            String string = "";
+            if(event.getSource()==item1)
+                string=String.format("field 1 : %s",event.getActionCommand());
+            else if(event.getSource()==item2)
+                string=String.format("field 2 : %s",event.getActionCommand());
+            else if(event.getSource()==item3)
+                string=String.format("field 3 : %s",event.getActionCommand());
+            else if(event.getSource()==passwordField)
+                string=String.format("password field is : %s",event.getActionCommand());
+
+            JOptionPane.showMessageDialog(null,string);
+        }
+    }
+
+
+}

src/e50GUI.java

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+import javax.swing.JOptionPane;
+
+public class e50GUI {
+    public static void main(String[] args){
+        String fn =JOptionPane.showInputDialog("Enter first number");
+        String sn =JOptionPane.showInputDialog("Enter second number");
+        //showInputDialog only give a string
+        //we need to convert the variable to an integer
+        int num1 = Integer.parseInt(fn);
+        int num2 = Integer.parseInt(sn);
+        //show the sum
+        int sum = num1 + num2;
+        //display the sum on a box
+        JOptionPane.showMessageDialog(null,"The answer is: "+sum,"Sum",JOptionPane.PLAIN_MESSAGE);
+
+
+    }
+}

src/e51GUIwJFrame.java

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+import javax.swing.JFrame; //basic window
+
+
+public class e51GUIwJFrame extends JFrame{
+    public static void main(String [] args){
+        duna8 bucky = new duna8();
+        bucky.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //whenever press X program terminates
+        bucky.setSize(278,180);
+        bucky.setVisible(true);
+    }
+}

src/e52ActionListener.java

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+import javax.swing.JFrame;
+
+
+public class e52ActionListener extends JFrame{
+    public static void main(String [] args){
+        duna9 bucky = new duna9();
+        bucky.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        bucky.setSize(350,100);
+        bucky.setVisible(true);
+    }
+}