vb.net free barcode dll n Assignment statements n Conditional statements n Iteration statements in Java

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n Assignment statements n Conditional statements n Iteration statements
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An assignment statement is considered an expression statement. Let s briefly discuss expression statements first. Expression statements essentially work with expressions. Expressions in Java are considered to be anything that has a value or is reduced to a value. Typically, expressions evaluate to primitive types, such as in the case of adding two numbers [for example, (1+2)]. Concatenating strings together with the concatenation (+) operator results in a string, and is also considered an expression. All expressions can be used as statements; the only requirement is that they end with a semicolon. Of the Java expression statements represented in Table 2-2, the only expression statement covered on the exam via the objectives in this chapter is the assignment expression statement.
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Assignment expression statements, commonly known as just assignment statements, are designed to assign values to variables. All assignment statements must be terminated with a semicolon. Having this ability to store information in variables provides the main characteristic of usefulness to computer applications.
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TABlE 2-2
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Expression Statement
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Assignment Pre-increment Pre-decrement Post-increment Post-decrement Method invocation Object creation
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Expression Statement Example
variableName = 7; ++variableName; --variableName; variableName++; variableName--; performMethod(); new ClassName();
Coverage
This chapter 4 4 4 4 5 4
The general usage of the assignment statement: variable = value; Given the declaration of an integer primitive, let s look at an assignment in its most basic form. There are three key elements. On the left you will find the variable that will be associated with the memory and type necessary to store the value. On the right is a literal value. If an expression is on the right, such as (1+2), it must be evaluated down to its literal value before it can be assigned. Lastly, an equal sign will reside between the variable and value of an assignment statement.
int variableName; // Declaration of an integer variableName = 100; // Assignment expression statement
For as long as the application is running and the object in which the variable exists is still alive, the value for variableName will remain the assigned value, unless it is explicitly changed with another expression statement. The statement, illustrated in Figure 2-1, combines a declaration, an expression, and an assignment statement. In addition, it uses the values stored from previous assignment statements.
int fishInTank = 100; int fishInCooler = 50; int totalFish = fishInTank + fishInCooler;
declaration expression
FIgURE 2-1
Combined statements
int totalFish = fishInTank + fishInCooler; assignment statement
2:
Programming with Java Statements
Trying to save an invalid literal to a declared primitive type variable will result in a compiler error. For more information about working with primitives, see 4.
Conditional Statements
Conditional statements are used when there is a need for determining the direction of flow based on conditions. Conditional statements include the if, if-then, if-then-else, and switch statements. The conditional statements represented in Table 2-3 will be seen on the exam.
The if Conditional Statement
The if statement is designed to conditionally execute a statement or conditionally decide between a choice of statements. The if statement will execute only one statement upon the condition, unless braces are supplied. Braces, also known as curly brackets, allow for multiple enclosed statements to be executed. This group of statements is also known as a block. The expression that is evaluated within if statements must evaluate to a boolean value, or the application will not compile. The else clause is optional and may be omitted.
TABlE 2-3
Conditional Statements
Formal Name
if if-then
Keywords
if, else (optional) if, else if, else if (optional) if, else if, else if (optional), else switch, case, default (optional), break
Expression Types
boolean boolean
Example
if (value == 0) {} if (value == 0) {} else if (value == 1) {} else if (value >= 2) {} if (value == 0) {} else if (value >=1) {} else {} switch (100) { case 100: break; case 200: break; case 300: break; default: break;
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