[PDF] Short Circuit Evaluation of Javas Boolean Operators

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Short Circuit Evaluation of Javas Boolean Operators

Java's && and operators use short circuit evaluation Java's & and operators also test for the "and" and "or" conditions, but these & and operators don't do short circuit evaluation In other words, when Java encounters the following code, Java checks to see if 0 == 1 is true and then, before giving its

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if (0 == 1 && 2 + 2 == 4) { out.println("This line won"t be printed."); if (2 + 2 == 4 || 0 == 1) { out.println("This line will be printed."); true͵Μ if (0 == 1 && 2 + 2 == 4) { out.println("This line won"t be printed."); import static java.lang.System.out;; public class OperatorEvalDemo { public static void main(String args[]) { new OperatorEvalDemo();

OperatorEvalDemo() {

if (0 == 1 && 2 + 2 == 4) { out.println("(0 == 1 && 2 + 2 == 4) is true"); } else { out.println("(0 == 1 && 2 + 2 == 4) is false"); out.println(); if (2 + 2 == 4 || 0 == 1) { out.println("(2 + 2 == 4 || 0 == 1) is true"); } else { out.println("(2 + 2 == 4 || 0 == 1) is false"); out.println(); if (isFalse() && isTrue()) { out.println("(isFalse() && isTrue()) is true"); } else { out.println("(isFalse() && isTrue()) is false"); out.println(); if (isFalse() & isTrue()) { out.println("(isFalse() & isTrue()) is true"); } else { out.println("(isFalse() & isTrue()) is false"); out.println(); if (isTrue() || isFalse()) { out.println("(isTrue() || isFalse()) is true"); } else { out.println("(isTrue() || isFalse()) is false"); out.println(); if (isTrue() | isFalse()) { out.println("(isTrue() | isFalse()) is true"); } else { out.println("(isTrue() | isFalse()) is false"); boolean isTrue() { out.println("Executing isTrue"); return true; boolean isFalse() { out.println("Executing isFalse"); return false; (2 + 2 == 4 || 0 == 1) is true Executing isFalse (isFalse() && isTrue()) is false Executing isFalse Executing isTrue (isFalse() & isTrue()) is false

Executing isTrue (isTrue() || isFalse()) is true

Executing isTrue Executing isFalse (isTrue() | isFalse()) is trueğ public class Oops { public static void main(String args[]) {

Integer myInt;

myInt = new Integer(42); if (myInt != null && myInt.intValue() == 42) {

System.out.println("Comparing 42 to 42");

myInt = null; if (myInt != null & myInt.intValue() == 42) {

System.out.println("Comparing null to 42");

at SideEffectDemo.main(SideEffectDemo.java:12) myInt.intValue() == 42͵ if (checkAdjustHeart() & checkAdjustLung()) {

System.out.println("Both monitors are OK");

import static java.lang.System.out; import java.util.Scanner; import java.io.File; import java.io.IOException; import java.io.PrintStream; public class FindVacancy { public static void main(String args[]) throws IOException {

Scanner kbdScanner = new Scanner(System.in);

Scanner diskScanner =

new Scanner(new File("GuestList.txt")); int guests[] = new int[10]; int roomNum; for (roomNum = 0; roomNum < 10; roomNum++) { guests[roomNum] = diskScanner.nextInt(); roomNum = 0; while (roomNum < 10 && guests[roomNum] != 0) { roomNum++; if (roomNum == 10) { out.println("Sorry, no v cancy"); } else { out.print("How many people for room "); out.print(roomNum); out.print("? "); guests[roomNum] = kbdScanner.nextInt();

PrintStream listOut =

new PrintStream("GuestList.txt"); for (roomNum = 0; roomNum < 10; roomNum++) { listOut.print(guests[roomNum]); listOut.print(" "); int guests[] = new int[10]; guests[10] != 0 while (roomNum < 10 && guests[roomNum] != 0) { roomNum++; while (guests[roomNum] != 0 && roomNum < 10) { roomNum++;quotesdbs_dbs16.pdfusesText_22