visual basic 2010 barcode generator Nested Loops in Java

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Like all other programming languages, Java allows loops to be nested That is, one loop may be inside another For example, here is a program that nests for loops: // Loops may be nested class Nested { public static void main(String args[]) { int i, j; for(i=0; i<10; i++) { for(j=i; j<10; j++) Systemoutprint(""); Systemoutprintln(); }
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The output produced by this program is shown here:
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Java supports three jump statements: break, continue, and return These statements transfer control to another part of your program Each is examined here Note In addition to the jump statements discussed here, Java supports one other way that you can change your program's flow of execution: through exception handling Exception handling provides a structured method by which run-time errors can be trapped and handled by your program It is supported by the keywords try, catch, throw, throws, and finally In essence, the exception handling mechanism allows your program to perform a nonlocal branch Since exception handling is a large topic, it is discussed in its own chapter, 10
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In Java, the break statement has three uses First, as you have seen, it terminates a statement sequence in a switch statement Second, it can be used to exit a loop Third, it can be used as a "civilized" form of goto The last two uses are explained here
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By using break, you can force immediate termination of a loop, bypassing the conditional expression and any remaining code in the body of the loop When a break statement is encountered inside a loop, the loop is terminated and program control resumes at the next statement following the loop Here is a simple example: // Using break to exit a loop class BreakLoop { public static void main(String args[]) { for(int i=0; i<100; i++) { if(i == 10) break; // terminate loop if i is 10 Systemoutprintln("i: " + i); } Systemoutprintln("Loop complete"); } } This program generates the following output: i: 0 i: 1 i: 2 i: 3 i: 4 i: 5 i: 6 i: 7 i: 8 i: 9 Loop complete As you can see, although the for loop is designed to run from 0 to 99, the break statement causes it to terminate early, when i equals 10
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The break statement can be used with any of Java's loops, including intentionally infinite loops For example, here is the preceding program coded by use of a while loop The output from this program is the same as just shown // Using break to exit a while loop class BreakLoop2 { public static void main(String args[]) { int i = 0; while(i < 100) { if(i == 10) break; // terminate loop if i is 10 Systemoutprintln("i: " + i); i++; } Systemoutprintln("Loop complete");
When used inside a set of nested loops, the break statement will only break out of the innermost loop For example: // Using break with nested loops class BreakLoop3 { public static void main(String args[]) { for(int i=0; i<3; i++) { Systemoutprint("Pass " + i + ": "); for(int j=0; j<100; j++) { if(j == 10) break; // terminate loop if j is 10 Systemoutprint(j + " "); } Systemoutprintln(); } Systemoutprintln("Loops complete"); } } This program generates the following output: Pass 0: 0 1 2 3 4 5 6 7 8 9 Pass 1: 0 1 2 3 4 5 6 7 8 9 Pass 2: 0 1 2 3 4 5 6 7 8 9 Loops complete As you can see, the break statement in the inner loop only causes termination of that loop The outer loop is unaffected Here are two other points to remember about break First, more than one break statement may appear in a loop However, be careful Too many break statements have the tendency to destructure your code Second, the break that terminates a switch statement affects only that switch statement and not any enclosing loops Note break was not designed to provide the normal means by which a loop terminated The loop's conditional expression serves this purpose The break statement should be used to cancel a loop only when some sort of special situation occurs
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