change first character to uppercase

1) i need to know how to change a String first character to uppercase.

2) i also how to change all characters to lower case.

3) i also need to know how to replace a space with underscore
eg " " to "_".

if you are on unix use sed: here is a simple example of how to change any letter a with b in some file

sed 's/a/b/g' somefile


once you can figure out the regular expression it should be easy. if you need help with regex let me know.

Take a look at the docs for java.lang.String: http://java.sun.com/j2se/1.4/docs/a...ang/String.html

/* Example.java
*/


public class Example{

public static void main(String[] args){
Example example = new Example();
example.test();
}

public void test(){
String someString = "la la la la la la la";
/* 1) i need to know how to change a String first character to uppercase. */
String string1 = someString.substring(0,1).toUpperCase() + someString.substring(1);
/* 2) i also how to change all characters to lower case. */
String string2 = someString.toUpperCase();
/* 3) i also need to know how to replace a space with underscore
eg " " to "_". */
String string3 = someString.replace(' ','_');
System.out.println(someString);
System.out.println(string1);
System.out.println(string2);
System.out.println(string3);
}
}