Short Circuit Logical Operators in Java with Examples - GeeksforGeeks

02 Dec, 2021
In Java logical operators, if the evaluation of a logical expression exits in between before complete evaluation, then it is known as Short-circuit. A short circuit happens because the result is clear even before the complete evaluation of the expression, and the result is returned. Short circuit evaluation avoids unnecessary work and leads to efficient processing.
Below are the various types of Short circuits that occur in Java:
In the case of AND, the expression is evaluated until we get one false result because the result will always be false, independent of the further conditions. If there is an expression with &&(logical AND), and the first operand itself is false, then a short circuit occurs, the further expression is not evaluated, and false is returned.
Example: Short-circuiting using AND(&&) operator.
Java
// Java code to demonstrate the// short circuiting using &&  import java.io.*;  class ShortCirAND {    public static void main(String arg[])    {          // Since first operand is false        // and operator is &&,        // Evaluation stops and        // false is returned.        if (false && true && true) {            System.out.println("This output "                               + "will not "                               + "be printed");        }        else {              System.out.println("This output "                               + "got printed actually, "                               + " due to short circuit");        }          // Whole expression will be evaluated,        // as no false is encountered        // before last condition        // Therefore no Short circuit        if (true && true && true) {            System.out.println("This output "                               + "gets print"                               + " as there will be"                               + " no Short circuit");        }        else {              System.out.println("This output "                               + "will not "                               + "be printed");        }    }}
This output got printed actually,  due to short circuit
This output gets print as there will be no Short circuit
In the case of OR, the expression is evaluated until we get one true result because the result will always be true, independent of the further conditions. If there is an expression with ||(logical OR), and the first operand itself is true, a short circuit occurs, evaluation stops, and true is returned.
Example: Short-circuiting using OR( || ).
Java
// Java program to demonstrate the// short circuiting using OR  class ShortCirOR {    public static void main(String arg[])    {          // Since first operand is true        // and operator is ||,        // Evaluation stops and        // true is returned.        if (true || false || false) {            System.out.println("This output "                               + "got printed actually, "                               + " due to short circuit");        }        else {            System.out.println("This output "                               + "will not "                               + "be printed");        }          // Whole expression will be evaluated,        // as no true is encountered        // before last condition        // Therefore no Short circuit        if (false || false || true) {            System.out.println("This output "                               + "gets print"                               + " as there will be"                               + " no Short circuit");        }        else {              System.out.println("This output "                               + "will not "                               + "be printed");        }    }}
This output got printed actually,  due to short circuit
This output gets print as there will be no Short circuit
jasonleake
nishkarshgandhi
Java-Operators
Java
Java-Operators
Java
Writing code in comment?
Please use ide.geeksforgeeks.org,
generate link and share the link here.
Comments
Old Comments
Functional Interfaces in Java
Stream In Java
Constructors in Java
Different ways of Reading a text file in Java
Exceptions in Java
Generics in Java
Comparator Interface in Java with Examples
Strings in Java
How to remove an element from ArrayList in Java?
Difference between Abstract Class and Interface in Java