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package suma;
import java.io.*;
public class Main {
public static void main(String[] args)throws IOException {
BufferedReader in = new BufferedReader(newInputStreamReader(System.in));
int num;
System.out.print("Ingrese numero : ");
num = Integer.parseInt(in.readLine( ));
System.out.println("Ud ingreso el numero : " + num );
}
}

switch(valora evaluar)
{
case valor_cte_1 : instruccion_1 break;
case valor_cte_2 : instruccion_2 break;
:
:
case valor_cte_n : instuccion_n break;
default : instruccion por defecto
}

while(num <101)
{
System.out.println(num);
num = num + 1;
}

package prueba3;
import javax.swing.JOptionPane;
public class Pruebas {
public static void main(String[] args) {
Stringpnum,snum;
int n1,n2,suma;
pnum=JOptionPane.showInputDialog("escriba el primer numero: ");
snum=JOptionPane.showInputDialog("escriba el segundo numero: ");n1=Integer.parseInt(pnum);
n2=Integer.parseInt(snum);
suma=n1+n2;
JOptionPane.showMessageDialog(null,"la suma es "+suma, "resulatdos", JOptionPane.PLAIN_MESSAGE);
System.exit(0);}
}

package prueba3;
import javax.swing.JApplet;
import java.awt.Graphics;
public class Pruebas extends JApplet{
public void main(Graphics g) {
g.drawString("Vienvenidos ajava", 25, 25);
}

}

package alfredo;
import javax.swing.*;
public class Principal{

public static void main(String[] args) {
JTextArea areasalida=new JTextArea(5,5);JScrollPane desplaza= new JScrollPane( areasalida );
String salida="alfredo\npio\ncorpus\n......\n......\n........" +
"\n......\n.......\n.......\n";areasalida.setText(salida);
JOptionPane.showMessageDialog(null, desplaza, "Tablas", JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}

}

package alfredo;
import javax.swing.*;
public class...