Java - Nuevo programando y con errores

package com.ejercicio.main;

import java.text.NumberFormat;

import java.text.ParseException;

import java.util.Locale;

import java.util.Scanner;

public class EjercicioActualMain {

	public static void main(String[] args) throws ParseException {

		String a, b;

		Scanner scaner = new Scanner(System.in);

		System.out.print("Ingrese un numero DECIMAL: ");

		a = scaner.next();

		System.out.print("Ingrese otro numero DECIMAL: ");

		b = scaner.next();

		NumberFormat format = NumberFormat.getInstance(Locale.FRANCE);

	    Number number1 = format.parse(a);

	    Number number2 = format.parse(b);

	    double c = number1.doubleValue() + number2.doubleValue();

	    System.out.println("Resultado: " + c);

	}

}

Scanner scan = new Scanner(System.in);

System.out.print("Ingrese un numero: ");

int num = scan.nextInt();

System.out.println();

for(int i = 0; i < 10; i++){

	System.out.println("Dato: " + num);

}

Scanner scan = new Scanner(System.in);

System.out.print("Ingrese un numero: ");

int num = scan.nextInt();

System.out.println();

int i = 0;

do{

	System.out.println("Dato: " + num);

	i++;

} while(i < 10);

Scanner scan = new Scanner(System.in);

System.out.print("Ingrese un numero: ");

int num = scan.nextInt();

System.out.println();

int i = 0;

while(i < 10){

	System.out.println("Dato: " + num);

	i++;

}

Scanner in = new Scanner(System.in);

int i=0;

int num = 0;

int multip = 0;

do{

    System.out.println("Ingrese un numero ");

    num = num + in.nextInt();

    i++;

}while(i<10);

System.out.println(num);

import java.awt.BorderLayout;

import java.awt.EventQueue;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Ventana extends JFrame {

	JPanel panel;

	JLabel label;

	JTextField texto;

	JButton ok;

	/**

	 * @param args

	 */

	public Ventana() {

		setTitle("Ventana");

		setDefaultCloseOperation(EXIT_ON_CLOSE);

		setLayout(new BorderLayout());

		panel = new JPanel();

		panel.setLayout(null);

		setContentPane(panel);

		label = new JLabel();

		label.setText("Escriba su nombre:");

		label.setBounds(10, 20, 250, 30);

		panel.add(label);

		texto = new JTextField();

		texto.setBounds(130, 20, 150, 30);

		panel.add(texto);

		ok = new JButton("OK");

		ok.setBounds(300, 20, 70, 30);

		ok.addActionListener(new ActionListener() {

			@Override

			public void actionPerformed(ActionEvent arg0) {

				// TODO Auto-generated method stub

				JOptionPane.showMessageDialog(null, "Hola usted se llama "+texto.getText());

				texto.setText("");

			}

		});

		panel.add(ok);

	}

	public static void main(String[] args) {

		// TODO Auto-generated method stub

		EventQueue.invokeLater(new Runnable() {

			@Override

			public void run() {

				// TODO Auto-generated method stub

				Ventana frame = new Ventana();

				frame.setSize(500, 150);

				frame.setLocationRelativeTo(null);

				frame.setVisible(true);

			}

		});

	}

}