visual basic 2010 barcode generator Using continue in Java

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Using continue
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Sometimes it is useful to force an early iteration of a loop That is, you might want to continue running the loop, but stop processing the remainder of the code in its body for this particular iteration This is, in effect, a goto just past the body of the loop, to the loop's end The continue statement performs such an action In while and do-while loops, a continue statement causes control to be transferred directly to the conditional expression that controls the loop In a for loop, control goes first to the iteration portion of the for statement and then to the conditional expression For all three loops, any intermediate code is bypassed Here is an example program that uses continue to cause two numbers to be printed on each line: // Demonstrate continue class Continue { public static void main(String args[]) { for(int i=0; i<10; i++) { Systemoutprint(i + " "); if (i%2 == 0) continue; Systemoutprintln(""); }
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This code uses the % operator to check if i is even If it is, the loop continues without printing a newline Here is the output from this program: 0 2 4 6 8 1 3 5 7 9
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As with the break statement, continue may specify a label to describe which enclosing loop to continue Here is an example program that uses continue to print a triangular multiplication table for 0 through 9 // Using continue with a label class ContinueLabel { public static void main(String args[]) { outer: for (int i=0; i<10; i++) { for(int j=0; j<10; j++) { if(j > i) { Systemoutprintln(); continue outer; } Systemoutprint(" " + (i * j)); } } Systemoutprintln(); } } The continue statement in this example terminates the loop counting j and continues with the next iteration of the loop counting i Here is the output of this program: 0 0 0 0 0 0 0 0 0 0
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Good uses of continue are rare One reason is that Java provides a rich set of loop statements which fit most applications However, for those special circumstances in which early iteration is needed, the continue statement provides a structured way to accomplish it
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return
The last control statement is return The return statement is used to explicitly return from a method That is, it causes program control to transfer back to the caller of the method As such, it is categorized as a jump statement Although a full discussion of return must wait until methods are discussed in 7, a brief look at return is presented here At any time in a method the return statement can be used to cause execution to branch back to the caller of the method Thus, the return statement immediately terminates the method in which it is executed The following example illustrates this point Here, return
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causes execution to return to the Java run-time system, since it is the run-time system that calls main( ) // Demonstrate return class Return { public static void main(String args[]) { boolean t = true;
Systemoutprintln("Before the return"); if(t) return; // return to caller } Systemoutprintln("This won't execute");
The output from this program is shown here: Before the return As you can see, the final println( ) statement is not executed As soon as return is executed, control passes back to the caller One last point: In the preceding program, the if(t) statement is necessary Without it, the Java compiler would flag an "unreachable code" error, because the compiler would know that the last println( ) statement would never be executed To prevent this error, the if statement is used here to trick the compiler for the sake of this demonstration
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