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We will discuss the use of if statements in the section on Java control structures, so for now simply observe that the > operator allows one to test the truth of the condition that assessed value is greater than $200,000. If the value of the variable assessedValue at the time the statement executes is greater that 200000, the logical operator > will return a value of true. Otherwise, it will return false. We will discuss the other logical operators in the section on Java control structures. Remember, too, that we have not discussed all Java operators. Java also has operators for testing and shifting bit values, conditional statement execution, modulo arithmetic, and some other functions. JAVA IDENTIFIERS Every programming language has its rules for how to name elements of a program. In Java, names must always begin with a letter. Letters in Java include all lowercase and uppercase letters, as well as the underscore character _ and the currency symbol $ . After the first letter, any number of letters and/or digits may follow. A Java identifier may be of any length, and it is good programming practice to use names long enough to be self-descriptive. More experienced programmers generally use longer variable names, because longer names usually make programs much easier to read and maintain. Java is a case-sensitive language. That means that Java recognizes uppercase and lowercase letters as different. The identifier university is different from University, and both are different from UNIVERSITY. While one is not required to do so, standard programming practice is to begin all class names with an uppercase letter, and to begin all other names with a lowercase letter. Also, when an identifier consists of more than one word, the usual practice is to use what s called camel case capitalization (it s humpy ). Here are some example variable names: highWindWarning wonLostRecord mothersMaidenName
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BASIC CONTROL STRUCTURES All programming languages provide ways to alter the sequence of instructions that actually get executed when a program runs. This ability to select which logic to apply, or to choose an appropriate number of times to cycle through a section of code, is what makes programs flexible enough to be useful in the real world. Imagine a program to compute the average grades for students in a class, but imagine that the program requires all classes to have exactly the same number of students, and has no way to properly handle a missing grade! Such a rigid program would not be worth the trouble to write.
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if The most common control structure for selecting a block of code to execute is the if statement. The if statement can be used in its simple form, or in its extended if-else form. Here is an example of a simple if statement: if(grade > 0) { sumOfGrades = sumOfGrades + grade; numberOfGrades++; } This statement says, if the variable grade is greater than 0, then add the grade value to the variable sumOfGrades, and increment the variable numberOfGrades by 1. Otherwise, do nothing. Either both
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statements following the if statement will be executed, or neither will be, because they are both within the curly brackets which follow the if. The curly brackets mark a code block. If the tested condition is true, then the code block of the if statement will be executed. If the condition is false, the code block will be skipped. Here is the syntax of the simple if statement: if( <conditional expression> ) <statement> The conditional expression must evaluate to either true or false. If the conditional expression is true, the following statement will be executed, but not otherwise. The <statement> can also be a compound statement, which is another way of saying that <statement> can be a code block enclosed in curly braces. A compound statement or code block is enclosed in curly braces, and each statement inside must be terminated with a semicolon. Here is an example of an if-else statement: if( windSpeed > 20 ) { hoistSmallSail(); } else { hoistLargeSail(); } The if-else statement allows the program to select one of two mutually exclusive paths of execution. In this case, if the wind is strong, the program calls a method to hoist a small sail. Otherwise, the program calls a method to hoist a large sail. By the way, you can tell that hoistSmallSail() and hoistLargeSail() are methods because a pair of parentheses follows the name. A method is a named block of code, and we will talk about methods when we discuss classes and objects in more detail later. Here is the syntax of the if-else statement: if( <conditional expression> ) <statement_one> else <statement_two> If the conditional expression is true, statement_one will be executed. If the conditional statement is false, statement_two will be executed. As before, statement_one and statement_two can be compound statements, i.e., code blocks framed in curly braces. for Programs frequently must iterate or loop through a block of code repeatedly. Java has several control structures for this purpose, and one of the most commonly used control structures of this type is the for loop. Suppose we want to compute the average grade in a class of students. We have the scores in a file called Students, and each line in the file contains a single score. Each score is the grade of one of the students (e.g., 89.5). We could write code such as this to read the scores from the file and compute the total of all the scores: double total = 0.0; BufferedReader in = new BufferedReader( new FileReader( "Students" ) ); for ( int i = 1; i <= numberOfStudents; i++ ) { String score = in.readLine(); total = total + Double.parseDouble( score ); }
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