1. import javax.swing.*;
public class ConcatenacionString{
public static void main(String args[]){
String s1=new String("Feliz ");
String s2=new String("Cumpleaños");
String salida="s1= "+s1+"ns2="+s2;
salida+="nnResultado De of s1.concat(s2)="+s1.concat(s2);
salida+="ns1 Despues De La Concatenacion ="+s1;
JOptionPane.showMessageDialog(null,salida,"El metodo Concat De
String",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
}
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import javax.swing.*;
public class StringDemo{
public static void main(String[]args){
String palindrome="Dot saw I was Tod";
int len=palindrome.length();
char[] tempCharArray=new char[len];
char[] charArray=new char[len];
for(int i=0;i<len;i++)
{
tempCharArray[i]=palindrome.charAt(i);
}
2. for(int j=0;j<len;j++)
{
charArray[j]=tempCharArray[len - 1 - j];
}
String reversePalindrome=new String(charArray);
JOptionPane.showMessageDialog(null,reversePalindrome);
for(int j=0;j<len;j++)
{
(if(tempCharArray[i]==charArray[i])
{
contador ++;
}
}
}
}
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import javax.swing.*;
public class indexOfEjemplo1{
public static void main(String args[]){
String cadena="Codigo Fuente en Java";
int index =cadena.indexOf("Java");
JOptionPane.showMessageDialog(null,index);
}
}
3. -----------------------------------------------------------------------------------------------------------------------------------
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import javax.swing.*;
public class indexOfEjemplo2{
public static void main(String args[])throws Exception{
String cadena="Codigo Fuente en Java y aca aparece otra vez Java";
int index =cadena.indexOf("Java");
JOptionPane.showMessageDialog(null,index);
index=cadena.indexOf("Java",index+1);
JOptionPane.showMessageDialog(null,index);
}
}
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import javax.swing.JOptionPane;
public class CompararString{
public static void main(String args[]){
String s1=new String("hola");
String s2="adios";
String s3="Feliz Cumpleaños";
String s4="feliz cumpleaños";
String salida="s1= "+s1+"ns2= "+s2+"ns3= "+s3+"ns4= "+s4+"nn";
if(s1.equals( "hola"))
{
salida+="s1 Es Igual A "hola"n";
}
4. else
{
salida+="s1 Es Distinto A "hola"n";
}
if(s1=="hola")
{
salida+="s1 Es Igual A "hola"n";
}
else
{
salida+="s1 Es Distinto A "hola"n";
}
if(s3.equalsIgnoreCase(s4))
{
salida+="s3 Es Igual A s4n";
}
else
{
salida+="s3 Es Distinta De s4n";
}
salida+="ns1.compareTo( s2 ) Es "+s1.compareTo( s2 )+"ns2.compareTo( s1 ) Es
"+s2.compareTo( s1 )+"ns1.compareTo( s1 ) Es "+s1.compareTo( s1 )+"ns3.compareTo( s4 ) Es
"+s3.compareTo( s4 )+"ns4.compareTo( s3 ) Es"+s4.compareTo( s3 )+"nn";
if(s3.regionMatches(0,s4,0,5))
{
salida+="Los Primeros 5 Caracteres De s3 Y s4 Concuerdann";
5. }
else
{
salida+="Los Primeros 5 Caracteres De s3 Y s4 No Concuerdann";
}
if(s3.regionMatches( true,0,s4,0,5))
{
salida+="Los Primeros 5 Caracteres De s3 Y s4 Concuerdan";
}
else
{
salida+="Los Primeros 5 Caracteres de s3 y s4 no Concuerdan";
}
JOptionPane.showMessageDialog(null,salida,"Comparaciones Entre
Cadenas",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
}
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importjavax.swing.*;
public class CompararApellidos{
public static void main(String args[]){
String apellido1= " ";
String apellido2= " ";
String Salida= " ";
6. apellido1=JOptionPane.showInputDialog(null,"Ingrese El Primer Apellido");
apellido2=JOptionPane.showInputDialog(null,"Ingrese El Segundo Apellido");
if(apellido1.equals(apellido2))
{
JOptionPane.showMessageDialog(null,"Son Iguales");
}
else
{
JOptionPane.showMessageDialog(null,"Son Diferentes");
}
System.exit(0);
}
}
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import javax.swing.JOptionPane;
public class UsuarioYContraseña{
public static void main(String args[]){
String usuario=" ";
String contra=" ";
int cont=0;
int contador=0;
do
{
usuario=JOptionPane.showInputDialog(null,"Digite El Usuario");
if(usuario.equalsIgnoreCase("Rigo"))
7. {
do
{
contra=JOptionPane.showInputDialog(null,"Digite El
Password");
if(contra.equals("VeGa"))
{
JOptionPane.showMessageDialog(null,"Bienvenido");
}
else
{
JOptionPane.showMessageDialog(null,"Error De
Contraseña");
cont++;
}
}
while(cont<3);
}
else
{
JOptionPane.showMessageDialog(null,"Erro De Usuario");
contador++;
}
}
while(contador<3);
System.exit(0);
![import javax.swing.*;
public class ConcatenacionString{
public static void main(String args[]){
String s1=new String("Feliz ");
String s2=new String("Cumpleaños");
String salida="s1= "+s1+"ns2="+s2;
salida+="nnResultado De of s1.concat(s2)="+s1.concat(s2);
salida+="ns1 Despues De La Concatenacion ="+s1;
JOptionPane.showMessageDialog(null,salida,"El metodo Concat De
String",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
}
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import javax.swing.*;
public class StringDemo{
public static void main(String[]args){
String palindrome="Dot saw I was Tod";
int len=palindrome.length();
char[] tempCharArray=new char[len];
char[] charArray=new char[len];
for(int i=0;i<len;i++)
{
tempCharArray[i]=palindrome.charAt(i);
}](https://image.slidesharecdn.com/tallerdestringjava-130318063137-phpapp02/85/Taller-de-string-java-1-320.jpg)
![for(int j=0;j<len;j++)
{
charArray[j]=tempCharArray[len - 1 - j];
}
String reversePalindrome=new String(charArray);
JOptionPane.showMessageDialog(null,reversePalindrome);
for(int j=0;j<len;j++)
{
(if(tempCharArray[i]==charArray[i])
{
contador ++;
}
}
}
}
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import javax.swing.*;
public class indexOfEjemplo1{
public static void main(String args[]){
String cadena="Codigo Fuente en Java";
int index =cadena.indexOf("Java");
JOptionPane.showMessageDialog(null,index);
}
}](https://image.slidesharecdn.com/tallerdestringjava-130318063137-phpapp02/85/Taller-de-string-java-2-320.jpg)
![-----------------------------------------------------------------------------------------------------------------------------------
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import javax.swing.*;
public class indexOfEjemplo2{
public static void main(String args[])throws Exception{
String cadena="Codigo Fuente en Java y aca aparece otra vez Java";
int index =cadena.indexOf("Java");
JOptionPane.showMessageDialog(null,index);
index=cadena.indexOf("Java",index+1);
JOptionPane.showMessageDialog(null,index);
}
}
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import javax.swing.JOptionPane;
public class CompararString{
public static void main(String args[]){
String s1=new String("hola");
String s2="adios";
String s3="Feliz Cumpleaños";
String s4="feliz cumpleaños";
String salida="s1= "+s1+"ns2= "+s2+"ns3= "+s3+"ns4= "+s4+"nn";
if(s1.equals( "hola"))
{
salida+="s1 Es Igual A "hola"n";
}](https://image.slidesharecdn.com/tallerdestringjava-130318063137-phpapp02/85/Taller-de-string-java-3-320.jpg)
![}
else
{
salida+="Los Primeros 5 Caracteres De s3 Y s4 No Concuerdann";
}
if(s3.regionMatches( true,0,s4,0,5))
{
salida+="Los Primeros 5 Caracteres De s3 Y s4 Concuerdan";
}
else
{
salida+="Los Primeros 5 Caracteres de s3 y s4 no Concuerdan";
}
JOptionPane.showMessageDialog(null,salida,"Comparaciones Entre
Cadenas",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
}
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importjavax.swing.*;
public class CompararApellidos{
public static void main(String args[]){
String apellido1= " ";
String apellido2= " ";
String Salida= " ";](https://image.slidesharecdn.com/tallerdestringjava-130318063137-phpapp02/85/Taller-de-string-java-5-320.jpg)
![apellido1=JOptionPane.showInputDialog(null,"Ingrese El Primer Apellido");
apellido2=JOptionPane.showInputDialog(null,"Ingrese El Segundo Apellido");
if(apellido1.equals(apellido2))
{
JOptionPane.showMessageDialog(null,"Son Iguales");
}
else
{
JOptionPane.showMessageDialog(null,"Son Diferentes");
}
System.exit(0);
}
}
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import javax.swing.JOptionPane;
public class UsuarioYContraseña{
public static void main(String args[]){
String usuario=" ";
String contra=" ";
int cont=0;
int contador=0;
do
{
usuario=JOptionPane.showInputDialog(null,"Digite El Usuario");
if(usuario.equalsIgnoreCase("Rigo"))](https://image.slidesharecdn.com/tallerdestringjava-130318063137-phpapp02/85/Taller-de-string-java-6-320.jpg)
