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CHAPTER 3 Expressions and Statements
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class Demo { public static void main (String args[]) { int a = 15, c = 0; c = ~a+1; Systemoutprintln (" a = " + a); Systemoutprintln (" ~a + 1 = " + c); } }
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Statements
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The purpose of learning Java is to be able to take control of a computer In order to do this, you must learn how to use Java keywords, operators, and operands to create expressions You can think of keywords, operators, and operands as words understood by Java, and you can think of an expression as the way to organize those words to convey your request to Java That request must be placed into a statement before Java will fulfill your request Think of a statement as a sentence A statement is a sentence that consists of an expression that gives an instruction to Java Every statement must end in a semicolon Java doesn t recognize an expression as an instruction unless the expression is in a statement that terminates with a semicolon Think of this as a period at the end of a sentence If you leave off the period, the reader won t know where one thought ends and another begins The reader will quickly become confused The same is true about Java Java becomes confused if you leave out a semicolon By now you should be very familiar with writing statements because statements were used throughout every example in this chapter
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Quiz
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1 What is a compound expression 2 What is a unary operator 3 What is the difference between an operator and an operand 4 What is the purpose of parentheses in a compound expression 5 What is precedence
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6 What does the modulus operator return
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Java Demystified
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7 Why is the position of the increment and decrement operators important 8 What does a relational operator do 9 What does a bitwise operator do 10 What does the || operator do
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CHAPTER
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Control Structures
Some people believe that computers are smarter than humans, but that s giving computers more credit than they are due Computers are as smart as the programmers who write instructions that computers follow In many of those programs, a computer executes some instructions only if certain conditions exist This requires the computer to make a decision Programmers tell computers how to make decisions by using control statements in their programs In this chapter, you ll learn how to tell a computer to make a decision and how to use various Java control statements in your program
Program Flow
A computer executes instructions sequentially, beginning with the first instruction in the program and continuing until no more instructions exists As you learned in
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Java Demystified
1, all Java applications begin with the first instruction in the definition of the main() method The program then flows to the second instruction, then the third instruction, and so on, until the last instruction in the main() method is executed Typically, some of the instructions in the main() method call groups of other instructions contained within a method definition For example, each time the Systemoutprintln() method is called, the flow of the program jumps from the main() method to the Systemoutprintln() method The flow returns to the instruction that called the Systemoutprintln() method after the last instruction in the Systemoutprintln() method definition executes Regardless of whether all the instructions are contained in the main() method or are divided among other methods, the flow of a program remains sequential That is, all instructions are executed at some point In the real world, rarely do all instructions contained in a program execute Some instructions execute all the time, whereas other instructions execute only when certain conditions are met Therefore, all instructions within a program do not execute sequentially Instead, some instructions are skipped This happens in a program used to register students for courses Whenever a student registers for a course, the program determines whether the student has fulfilled prerequisites If this condition is true, the program executes instructions that register the student for the course If the condition is false, the instructions that register the student for the course are skipped Programmers change the flow of a program by using control statements that tell the computer to evaluate an expression and, based on the evaluation, either execute or skip one or more instructions
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