Interface/Implements

banking.java
public interface banking { public void withdraw(); public void deposit(); public void balanceCheck(); }

saving.java

public class saving implements banking { saving()                 { System.out.println("\nConstructor has been executed\n"); } //------------------------------------------------------------------------- // If implementing banking, must have these three listed: //------------------------------------------------------------------------- public void withdraw()     { System.out.println("Saving withdraw    \n");  } public void deposit()      { System.out.println("Saving deposit     \n");  } public void balanceCheck() { System.out.println("Saving balanceCheck\n"); } }

Functions: Class, Instance and Constructor

testparent.java

public class testparent { public static void main(String[] args) { parent.hello();                     // 3. class function parent p1 = new parent();           // 1. constructor function p1.display();                       // 2. instance function parent p2 = new parent("ALICE");    // 1. overload constructor function p2.display();                       // 2. instance function p1.display();                       // 2. instance function } }

parent.java => super class

public class parent {   // Data Members -------------------------------------------------------------- String name;          // 1. instance variable go to each instance created static int total = 0; // 2. class variable shared by all // Function Members -------------------------------------------------------- // 1. Constructor Functions      //------------------------- parent()                //parent p1 = new parent(); has same name { name = " "; total++; } ------------------------------------------------------------------ parent(String n)        //parent p2 = new parent("some string"); w/arguments {                     //this is an overload construction function name = n; total ++; }      // 2. Instance Function      //--------------------- public void display() { System.out.printf("TOTAL %d NAME: %s \n", total, name ); }      // 3. Class Function      //--------------------- static public void hello() { System.out.printf("HELLO.Welcome.\n");        } }

JFrame

import javax.swing.JButton;
import javax.swing.JFrame;
import java.awt.Container;
import java.awt.BorderLayout;

public class MyBorder4 extends JFrame  // always has 2 parts
{
//--------------------------------------------------------------------------
// data members - these are instances of the button class
//--------------------------------------------------------------------------

JButton n = new JButton("Minnesota" );
JButton s = new JButton("Georgia"   );
JButton e = new JButton("Virginia"  );
JButton w = new JButton("Oregon"    );
JButton c = new JButton("Kansas"    );

//--------------------------------------------------------------------------
// method members
//--------------------------------------------------------------------------

// Default constructor : 3 steps
public MyBorder4()
{
// 1. Create a canvas (named c1)
Container c1 = getContentPane();

// 2. Set layout with 5 regions with horizontal gap 5 

//    and vertical 10
c1.setLayout(new BorderLayout(5,10));

// 3. place button objects on canvas
c1.add(e, BorderLayout.EAST  );
c1.add(w, BorderLayout.WEST  );
c1.add(s, BorderLayout.SOUTH );
c1.add(n, BorderLayout.NORTH );
c1.add(c, BorderLayout.CENTER);
}
//----------------------------------------------------------------------------------
// Main method
//----------------------------------------------------------------------------------

public static void main(String[] args)
{
MyBorder4 frame1 = new MyBorder4();
frame1.setTitle("Lynn Tobias' Border Layout");
frame1.setDefaultCloseOperation(3);
frame1.setSize(300,150);
frame1.setVisible(true);
}
}