### 12. Second Occurrence

Answer:    String statement = "value = alpha*beta + gamma;"  ;

int loc = statement.indexOf( "=");
if ( loc != -1 )
{
String left = statement.substring(  0, loc );
String right = statement.substring( loc + 1  );
}

# Second Occurrence

A correct line of a Java program only rarely includes two assignment operators. Here is a program fragment that inspects a line for this:

String line = "alpha = beta + 23 = 99;" ;
int spot = line.indexOf( "=" );
if (  spot != -1 ){  String newLine = line.substring( spot+1 ) ;  if ( newLine.indexOf("=") > 0  )  {    System.out.println( "Possible Bad Line: " + line );   }}

The statement

  String newLine = line.substring( spot+1 ) ;


computes the tail of the original line, starting with the character after the first = sign. The clause newLine.indexOf("=") > 0 detects = anywhere but at the beginning of this new line (where it would be OK because it would be part of "==").

Question 12:What if you did not have the startsWith(String str) method? Could you use other methods to replace it?