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The second way to create an endless for loop is to simply use the keyword true as the conditional expression In order to break out of the loop, you ll need to include a break statement within the body of the loop This method is illustrated in the next example The body of the for loop contains an if statement that uses the control variable in its conditional expression When Java detects that the conditional variable is 5, the break statement within the if statement is executed This is the same break statement used in the switch statement The break statement tells Java to exit the for loop
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class Demo { public static void main (String args[]) { for (int x = 0; true ; x++ ) { Systemoutprintln("Current value of x = " + x); if (x == 5) break; } } }
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The third way to create an endless for loop is to simply not include a conditional expression Java assumes that the condition is true if the conditional expression is not found in a for loop The following example shows how to create this type of endless for loop You ll notice that this example is practically the same as the previous example, except the conditional expression is empty in the for loop Although there isn t a conditional expression, you are still required to include the semicolon
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class Demo { public static void main (String args[]) { for (int x = 0; ; x++ ) { Systemoutprintln("Current value of x = " + x); if (x == 5) break; } } }
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CHAPTER 4 Control Structures
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Some programmers prefer not to use a control variable in an endless for loop Instead, they use statements within the body of the for loop to control when Java should break out of the loop Let s say that you ve written a program that displays a menu You could place statements that read the keyboard inside an endless for loop When a valid menu item is received by one of those statements, you can break out of the loop and process the menu item You can continue to loop until a valid menu item is entered
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You can place one or more for loops within the body of another for loop Programmers call this nesting for loops The nested for loop is referred to as the inner for loop and is placed inside the outer for loop Each time Java loops around the outer for loop, it loops around the inner for loop until it breaks out of the inner loop Let s see how this works in the next example, which has two for loops Statements in the outer loop are executed five times before the conditional expression is false The statement in the inner loop is executed three times before the conditional expression in the inner loop is false Each time the outer loop is looped, the inner loop is looped three times
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class Demo { public static void main (String args[]) { for (int x = 0; x < 5 ; x++ ) { Systemoutprintln("Current value of x = " + x); for (int y = 0; y < 3 ; y++) Systemoutprintln( "Current value of y = " + y); } } }
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The while Loop
Another kind of iteration statement is the while loop The while loop tells Java to execute one or more statements contained in the body of the while as long as a conditional expression is true Statements within the while loop are not executed if the conditional statement is false When Java sees a while loop in your program, it immediately evaluates the while loop s conditional expression, which is a relational expression If the
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