Built in packages & String Class

String replace(char original, char replacement); Replaces all the occurrence of the character “original” by “replacement” into the involving string object.

import java.lang.*;
class App42
{
public static void main(String yck[])
{
String x=new String("foxpro");
String y=x.replace('o','i');
System.out.println(y);
}
}


output:

\>javac App42.java
\>java App42
fixpri

String trim(); Removes leading all as well as trailing blank spaces from the invoking String object.

import java.lang.*;
class App43
{
public static void main(String yck[])
{
String x=new String("foxpro");
System.out.println(x.length());
String y=x.trim();
System.out.println(y);
}
}


output:

\>javac App43.java
\>java App43
6
foxpro

String toLowerCase(); Converts to lower case.

String toUpperCase(); Converts to upper case.

import java.lang.*;
class App44
{
public static void main(String yck[])
{
String x=new String("Chaitanya KRISHNA");
String y=x.toLowerCase();
String z=x.toUpperCase();
System.out.println(y);
System.out.println(z);
}
}


output:

\>javac App44.java
\>java App44
chaitanya krishna
CHAITANYA KRISHNA