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# Strings e clases envolventes

1. Palindromo

```java
public static boolean palindromo(String pal1){
        String palabra1 = pal1.toLowerCase().trim().replace(" ","");
        while (palabra1.length()>0){
            if (palabra1.charAt(0) == palabra1.charAt(palabra1.length()-1)){
                palabra1 = palabra1.substring(1,palabra1.length()-1);
            } else
                return false;
        }

        return true;
    }
```

2. cifradoDesplazamiento

```java
public static String cifradoDesplazamiento(String texto, String clave) {
		String textoCifrado = "";
		
		for (int i=0; i<texto.length(); i++) {
			char c = texto.charAt(i);
			int indice = c - 'a';;
			textoCifrado+=String.valueOf(clave.charAt(indice));
		}
		
		return textoCifrado;
	}
```

3. cifradoCesar

```java
public static String cifradoCesar(String texto) {
		String cifrado = "";
		texto.toLowerCase();
		for (int i=0; i<texto.length(); i++ ) {
			char c = texto.charAt(i);
			int pos = (c - 'a' + 5) % (26); //al ascii de la letra le sumamos 5, y calculamos el modulo en valor del numero de letras del alfabeto menos ñ
			c = (char) ('a' + pos);
			cifrado += String.valueOf(c);// que posición del alfabeto tiene la letra cifrada. Le sumamos esta posicion a la primera letra y lo convertimso a string para convertirla  
		}
		return cifrado;
	}

```

4. Anagrama

```java
public static boolean anagrama(String pal1, String pal2){
        if (pal1.length()!=pal2.length()){
            return false;
        }
        String palabra1 = pal1.toLowerCase();
        String palabra2 = pal2.toLowerCase();

        while (palabra1.length()>0){
            char c = palabra1.charAt(0);
            if (palabra2.contains(String.valueOf(c))){
                palabra1 = palabra1.substring(1,palabra1.length());
                int index = palabra2.indexOf(c);
                if (index == (palabra2.length()-1)){
                    palabra2 = palabra2.substring(0,palabra2.length()-1);
                } else {
                    palabra2 = palabra2.substring(0,index) + palabra2.substring(index+1, palabra2.length());
                }
            } else {
                return false;
            }
        }
        return true;

    }
```


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