RD Programming Concepts Training - Batch 1 (part 2)

Gui1.java

import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.event.*;

class Gui1 extends JFrame implements ActionListener {

	JLabel label = new JLabel("Your name: ");
	JTextField tf = new JTextField(20);
	JButton b = new JButton("Ok");
	FlowLayout fl = new FlowLayout();
	
	Gui1() {
		
		setLayout(fl);
		
		add(label);
		add(tf);
		add(b);
	
		b.addActionListener(this);
		
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(300,300);
		setVisible(true);
	}
	
	public void actionPerformed(ActionEvent ae) {
		tf.setText("Hello World");
	}
	
	public static void main(String[] args) {
		new Gui1();
	}
}

Gui2.java

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

class Gui2 extends JFrame {

	JTextField tf = new JTextField(20);
	JButton btn = new JButton("Click me");

	MyListener ml;ja

	Gui2() {
		
		ml = new MyListener(this);
		
		setLayout(new FlowLayout());
		add(tf);
		add(btn);
		
		btn.addActionListener(ml);
		
		setDefaultCloseOperation(3);
		pack();
		setVisible(true);
	}

	public static void main(String[] args) {
		new Gui2();
	}
}

class MyListener implements ActionListener {

	Gui2 g2;

	MyListener(Gui2 var) {
		g2 = var;
	}

	@Override
	public void actionPerformed(ActionEvent ae) {
		g2.tf.setText("Hello World");		
	}
}

Gui3.java

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JButton;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;


class Gui3 extends JFrame implements ActionListener {

	JTextField tf;
	JButton btn;
	int counter = 0;
	
	Gui3() {
		
		setLayout(new java.awt.FlowLayout());
	
		tf = new JTextField(20);
		btn = new JButton("Okay");
		
		add(tf);add(btn);
		
		btn.addActionListener(this);
		
		setDefaultCloseOperation(3);
		pack();
		setVisible(true);
	}

	@Override
	public void actionPerformed(ActionEvent ae) {
		btn.setText(++counter + "");
		tf.setText(++counter + "");
	}

	public static void main(String[] args) {
		new Gui3();
	}
}

Gui4.java

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

class Gui4 extends JFrame {

	JTextField tf = new JTextField(20);
	JButton btn = new JButton("OK");
	JButton btnx = new JButton("Cancel");
	
	Gui4() {
		
		InListener in = new InListener();
		
		setLayout(new FlowLayout());
		add(tf);
		add(btn);
		add(btnx);
		
		btn.addActionListener(in);
		
		btnx.addActionListener(
			new ActionListener() {
				public void actionPerformed(ActionEvent ae) {
					tf.setText("From anonymous class");
				}
			}
		);
		
		pack();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
	}
 
	// INNER CLASS
	
	class InListener implements ActionListener {
		
		public void actionPerformed(ActionEvent ae) {
			tf.setText("From Inner class");
		}
	}

	// END INNNER CLASS
	
	public static void main(String[] args) {
		new Gui4();
	}
}

RandomWord.java

class RandomWord extends Gui3 {


	String animals[];
	int counter = 0; 

	RandomWord() {
	
		animals = new String[] {"Dog","Cat","Lion","Mountain Lion","Leopard"};
		
	}
	
	public void actionPerformed(java.awt.event.ActionEvent ae){
		//tf.setText(this.getClass().getName());
		//tf.setText(animals[++counter]);
		tf.setText(ae.getActionCommand());
	}
	
	public static void main(String[] args) {
		new RandomWord();
	}

}

Str.java

class Str {

	public static void main(String[] args) {
		String s = "Hello";
		reverse(s);
	}
	
	static void reverse(String var) {
		
		char temp[] = new char[var.length()];
		char pmet[] = new char[var.length()];
		
		for(int i=0;i<var.length();i++) {
			temp[i] = var.charAt(i);
		}

		for(int i = var.length()-1; i >= 0; i--) {
			pmet[i] = var.charAt(i);
		}
		
		System.out.println(pmet);
		System.out.println(var.charAt(3));
	}
}

ThreadG.java

import java.awt.event.*;

class ThreadG extends Gui3 {


	public void actionPerformed(ActionEvent ae){
		MyThread t = new MyThread();
		t.start();
		
		System.out.println("");
	}

	public static void main(String[] args) {
		new ThreadG();
	}

}

class MyThread extends Thread {
	public void run(){
		for(long i=1;i<100000000;i++){
			System.out.println(i);
		}	
	}
}

UserForm.java

import javax.swing.*;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.BorderLayout;


class UserForm extends JFrame {

	JLabel lblfname = new JLabel("First name : ");
	JLabel lbllname = new JLabel("Last name :");
	JLabel lblemail = new JLabel("Email :");

	JTextField tffname = new JTextField(20);
	JTextField tflname = new JTextField(20);
	JTextField tfemail = new JTextField(20);
	
	JButton btnok = new JButton("Okay");
	JButton btncancel = new JButton("Cancel");

	JPanel pcenter = new JPanel();
	JPanel psouth = new JPanel();
	
	GridLayout gl = new GridLayout(3,2);
	FlowLayout fl = new FlowLayout();


	UserForm() {
	
		pcenter.setLayout(gl);
		psouth.setLayout(fl);
		
		psouth.add(btnok);
		psouth.add(btncancel);
		
		pcenter.add(lblfname);
		pcenter.add(tffname);
		pcenter.add(lbllname);
		pcenter.add(tflname);
		pcenter.add(lblemail);
		pcenter.add(tfemail);

		add(pcenter, BorderLayout.CENTER);
		add(psouth, BorderLayout.SOUTH);
		
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		pack();
		setVisible(true);
	}

	public static void main(String[] args) {
		new UserForm();
	}
}