## 1 Sample Code
```java
public class StrSamples
{
public static void main (String args \[\])
{
String s ="This is a sample string";
System.out.println(s);
System.out.println("It contains this many characters (counting spaces): "+ s.length());
System.out.println("Here it is split up by whitespace:");
String \[\] seperated= s.split("\\\\s+");
for(int i=0; i<seperated.length; i++)
{
System.out.println(seperated\[i\]);
}
System.out.println("Here it is split up by the letter a:");
String \[\] sep2= s.split("a");
for(int i=0; i<sep2.length; i++)
{
System.out.println(sep2\[i\]);
}
System.out.println("Here are the characters from position 1 to 3:");
System.out.println(s.substring(1,3));
System.out.println("Here it is with the spaces removed");
String r= s.replaceAll("\\\\s", "");
System.out.println(r);
System.out.println("Here it is with the letter s replaced by sausage");
r= s.replaceAll("s", "sausage");
System.out.println(r);
System.out.println("Here it is with the lower case letters turned to \*s");
r= s.replaceAll("\[a-z\]", "\*");
System.out.println(r);
}
}
```
## 2 Exercises
1. Output the length of the String "I never saw a purple cow"
2. Convert the String "I never saw a purple cow" to uppercase and output the resulting string.
3. Output the String "I never saw a purple cow" as separate words.
4. Output the following String array as one String: words \[\] = {"Calling", "occupants", "of", "interplanetary", "craft"};
5. Prompt the user to enter a string. Output the string as separate words in alternate upper and lower case: SO it LOOKS like THIS example
6. Prompt the user to enter a String. Output a String named initialism that contains the initial letters of the words input. Example: input "British Broadcasting Corporation" output "BBC"
7. Prompt the user to enter a string. Output the number of times the letter 'e' appears in the string.
8. Prompt the user to enter a string. Output the number of vowels in the String.
9. Prompt the user to enter a String. Output a String with the vowels replaced with \*'s. Example: input "I never saw a purple cow" output "\* n\*v\*r s\*w \* p\*rpl\* c\*w"
10. A palindrome is a string that reads the same forwards and backwards. Examples are "radar" and "rotavator". Write a program that accepts a String as input and outputs "Palindrome" if the String is a palindrome, and "Not Palindrome" otherwise.