1 Sample Code
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
- Output the length of the String “I never saw a purple cow”
- Convert the String “I never saw a purple cow” to uppercase and output the resulting string.
- Output the String “I never saw a purple cow” as separate words.
- Output the following String array as one String: words [] = {“Calling”, “occupants”, “of”, “interplanetary”, “craft”};
- 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
- Prompt the user to enter a String. Output a String named acronym that contains the initial letters of the words input. Example: input “British Broadcasting Corporation” output “BBC”
- Prompt the user to enter a string. Output the number of times the letter ‘e’ appears in the string.
- Prompt the user to enter a string. Output the number of vowels in the String.
- 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”
- 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.