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The first line declares a thing called a BufferedReader, which is wrapped around a FileReader that opens the file called Students. We will discuss these sorts of input/output statements further in the section on Input and Output. This statement declares the variable in to be a BufferedReader associated with the file Students. Notice that programming statements in Java can continue to a second, third, or more lines. The Java compiler will continue to interpret the lines as one statement until it encounters the semicolon, which marks the end of the statement. The for statement begins with parentheses enclosing three expressions, which are separated by semicolons. The first expression defines initial conditions in the for loop. In this case, the expression declares an int called i, and sets the value of i to 1. The second expression in the for statement establishes a condition which will evaluate to either true or false. When the condition is true, the code block of the for statement will be executed. In this case, as long as the value of i is less than or equal to the number of students, the loop will execute. The third expression in the for statement specifies what to change each time the loop is executed. This expression is sometimes called the increment expression, because it is usually employed to change the value of the variable being tested in the second expression. That is the case here, because the third expression says to increment the value of the variable i each time the loop executes. The body or code block of the for statement follows the three expressions within parentheses. In this case, the readLine() method of the BufferedReader reads the next line of the file into a String variable called score. Since the BufferedReader reads character strings, we must convert the characters into an internal floating-point number before we can do our math. The last line says use the parseDouble() method of the Double class to interpret the character string in score (e.g., 89.5) as a double (a floating-point number which can include a fractional part). The Double class is one of Java s wrapper classes, which we discussed in the section on data types. In summary, this for loop will begin executing with the value of i set to 1. After each execution of the loop, the value of i will be incremented. The loop will continue to execute as long as the value of i is no greater than the number of students. When i becomes greater than the number of students, the conditional test in the second expression of the for statement will fail (will be false), and the program will drop out of the loop and continue at the next statement following the for loop body. Here is the syntax of the for statement: for( <initial>; <test condition>; <increment> ) <body> The conditional expression must evaluate to either true or false. If the conditional expression is true, the body of the for loop will be executed, but not otherwise. The <body> is usually a compound statement, which is a code block enclosed in curly braces. Each statement within the body must be terminated with a semicolon. while Another structure to control looping (iteration) is the while statement. Suppose we don t know how many student scores are in the file of student scores. We can use a while statement to read the file until there are no more scores in the file to be read: double total = 0.0; BufferedReader in = new BufferedReader( new FileReader( "Students" ) ); String score = in.readLine(); while( score != null ) { total = total + Double.parseDouble( score ); score = in.readLine(); }
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