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condition is false, Java skips the body of the while loop and continues by executing the first statement that appears below the body of the while loop in your program However, if the conditional expression is true, Java enters the body of the while loop and executes each statement within the body in sequence If one of those statements is a break statement, Java immediately exits the body of the while loop and continues by executing the first statement below the body of the while loop If Java doesn t encounter a break statement, it continues executing statements within the while loop until the bottom of the loop is reached At that time, Java returns to the top of the while loop and reevaluates the conditional expression If the conditional expression is still true, Java reenters the body of the while loop and reexecutes those statements If the conditional expression is false, Java jumps out of the while loop and executes the first statement after the bottom of the body of the while loop The while loop consists of four components: the keyword while, the conditional expression placed within parentheses, the body of the while loop defined by opening and closing braces, and one or more statements within the body of the while loop that are executed if the conditional expression is true The following example illustrates how to use a while loop in your program This example begins by declaring an integer variable and initializing it to zero The while loop uses the integer variable in the conditional expression x < 5 If variable x is less than 5, Java is told to execute the two statements within the body of the while loop The first statement displays the value of x on the screen The second statement uses the incremental operator to increase the value of x by 1 After the value of x is incremented, Java returns to the top of the loop and reevaluates the conditional expression The value of x is now 1 and is still less than 5, so the conditional expression is true and Java once again enters the body of the while loop to execute those two statements Java continues to loop through the while loop until the value of x is 5, at which time Java exits the loop Because there isn t another statement that follows the closing brace of the while loop, the program terminates
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class Demo { public static void main (String args[]) { int x = 0; while (x < 5) { Systemoutprintln("Current value of x = " + x); x++; } } }
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CHAPTER 4 Control Structures
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In the previous section of this chapter, you learned how to create an endless for loop An endless loop is one where the conditional expression is always true The break statement is the only way to exit the loop You can create an endless while loop by using the keyword true as the conditional expression Here s how to create an endless while loop: First, notice that the conditional expression consists of the keyword true This causes Java to execute statements within the body of the while loop The first statement displays the value of x The second statement uses the incremental operator to increase the value of x by 1 You ve seen both of these statements used in the previous example The next statement is an if statement The conditional expression in the if statement determines whether the value of x is 5 If so, the break statement within the body of the if statement executes, causing Java to exit the while loop If the value of x isn t 5, Java returns to the top of the while loop, where it finds the conditional expression to still be true, causing it to again enter the body of the while loop and execute those statements
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class Demo { public static void main (String args[]) { int x = 0; while (true) { Systemoutprintln("Current value of x = " + x); x++; if (x == 5) break; } } }
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