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Message:

You have your BASIC ways...

Posted by Kishori Sharan on September 29, 2000 at 11:25 AM

Hi
I have created a simple java program to make you feel you are working in BASIC. It has Left, Right and Mid methods and they are static . So if you want to use then just call then as StringUtil.Left ( "Hello", 2 ) ; and it will return you "He" .

Thanx
Kishori

//////////////// StringUtil.java ////////////////////////
class StringUtil {

public static void main(String[] args) throws Exception {
String s = "kishori" ;

System.out.println ( " ************ Left( " + s + ", int ) ************* " );
System.out.println ( "Left ( s, -10 ) :" + Left ( s, -10 ) );
System.out.println ( "Left ( s, 0 ) :" + Left ( s, 0 ) );
System.out.println ( "Left ( s, 1 ) :" + Left ( s, 1 ) );
System.out.println ( "Left ( s, 2 ) :" + Left ( s, 2 ) );
System.out.println ( "Left ( s, 4 ) :" + Left ( s, 4 ) );
System.out.println ( "Left ( s, 7 ) :" + Left ( s, 7 ) );
System.out.println ( "Left ( s, 10 ) :" + Left ( s, 10 ) );

System.out.println ( " ************ Right( " + s + ", int ) ************* " );

System.out.println ( "Right ( s, -10 ) :" + Right( s, -10 ) );
System.out.println ( "Right ( s, 0 ) :" + Right ( s, 0 ) );
System.out.println ( "Right ( s, 1 ) :" + Right ( s, 1 ) );
System.out.println ( "Right ( s, 2 ) :" + Right ( s, 2 ) );
System.out.println ( "Right ( s, 4 ) :" + Right ( s, 4 ) );
System.out.println ( "Right ( s, 7 ) :" + Right ( s, 7 ) );
System.out.println ( "Right ( s, 10 ) :" + Right ( s, 10 ) );

System.out.println ( " ************ Mid( " + s + ", int, int ) ************* " );

System.out.println ( "Mid ( s, -10, 10 ) :" + Mid( s, -10, 10 ) );
System.out.println ( "Mid ( s, 0, 3 ) :" + Mid ( s, 0, 3 ) );
System.out.println ( "Mid ( s, 1, 4 ) :" + Mid ( s, 1, 4 ) );
System.out.println ( "Mid ( s, 4, 3 ) :" + Mid ( s, 4, 3) );
System.out.println ( "Mid ( s, 4, 4 ) :" + Mid ( s, 4, 4 ) );
System.out.println ( "Mid ( s, 2, 10 ) :" + Mid ( s, 2, 10 ) );
System.out.println ( "Mid ( s, 4, -1 ) :" + Mid ( s, 4, -1 ) );
System.out.println ( "Mid ( s, 7, 2 ) :" + Mid ( s, 7, 2 ) );
System.out.println ( "Mid ( s, -10, -10 ) :" + Mid ( s, -10, 10 ) );

}

public static String Right ( String str, int total ) {
String right = null ;

// Make sure the paramenter passed is not null
if ( str == null ) {
return null;
}

// if total chars from right is zero/less than zero then return empty string
if ( total <= 0 ) {
return "" ;
}

// If length of string passed is less than or equal to the
// no. of chars wanted from left then just return the parameter itself
if ( str.length ( ) <= total ) {
return str ;
}

// Take out the chars wanted from right
int beginIndex = str.length ( ) - total ;
right = str.substring ( beginIndex ) ;

return right ;


}





public static String Left ( String str, int total ) {
String left = null ;

// Make sure the paramenter passed is not null
if ( str == null ) {
return null;
}

// if total chars from left is zero/less than zero then return empty string
if ( total <= 0 ) {
return "" ;
}

// If length of parameter passed is less than or equal to the
// no. of chars wanted from left then just return the parameter itself
if ( str.length ( ) <= total ) {
return str ;
}

// Take out the chars wanted
left = str.substring ( 0, total ) ;

return left ;
}


public static String Mid ( String str, int startPos, int total ) {
String mid = null ;

// Decrement the startPos by one, we will do all calculations for strings
// starting at index zero
startPos-- ;

// Make sure the paramenter passed is not null
if ( str == null ) {
return null;
}

// if total chars from right is zero/less than zero then return empty string
if ( total <= 0 ) {
return "" ;
}

int len = str.length ( ) ;

// Make sure the startPos is not negative or greater than the length of string
if ( startPos < 0 || startPos > len - 1 ) {
return "" ;
}

// Calculate the end pos to be used in substring () method
int endPos = startPos + total ;

// Validate the endPos value
if ( endPos > len ) {
mid = str.substring ( startPos ) ;
}
else {
mid = str.substring ( startPos, endPos ) ;
}

return mid ;

}

}