Something to understand:

The post-increment operator (++ after the variable name) returns the old value of the variable and then increments the variable. So, if x is 5, then the expression x++ evaluates to 5 and has the side effect that x is set to 6.

This one is a bit special:

x = 2; y = 3; z = 4;
System.out.println("Result = "+ z + y++ * x); // output is Result = 46

Note that string concatenation is being used here. It prints Result =, then 4 which is the value of z, then the value of y++ * x which is 6. The 46 is not one number, it is a 4 and a 6 put after each other coming from two expressions.

Answer from Jesper on Stack Overflow
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AlgoCademy
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Increment And Decrement Operators in Java | AlgoCademy
Work on coding exercises and projects to reinforce your understanding of these concepts. In this lesson, we covered the increment and decrement operators in Java. We explored their basic usage, different forms (postfix and prefix), and common pitfalls. We also looked at advanced techniques, debugging tips, and best practices.
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Java Concept Of The Day
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Quiz On Increment And Decrement Operators : i++, ++i, i- -, - -i
July 28, 2023 - Answer : 0 initially, i=0 i = i++ โ€“ โ€“i + ++i โ€“ iโ€“ i = (i is used before increment) โ€“ (i is used after decrement) + (i is used after increment) โ€“ (i is used before decrement) i = 0(i=1) โ€“ 0(i=0) + 1(i=1) โ€“ 1(i=0) i = 0 โ€“ 0 + 1 โ€“ 1 = 0 ... public class IncrementDecrementQuiz { public static void main(String[] args) { boolean b = true; b++; System.out.println(b); } } ... Answer : No. ++ or โ€” canโ€™t be applied to boolean types. Also Read : 110+ Java Interview Programs With Solutions
People also ask

In the Java programming language, why can the increment (++) and decrement (--) operators not be used on boolean data types?
The increment (++) and decrement (--) operators cannot be used on boolean data types in Java because these operators are meant for numerical arithmetic operations that adjust a value by a single integer (either adding or subtracting 1). Boolean data types represent true or false states without any numerical value that can be incremented or decremented. Therefore, attempting to apply these operators to booleans does not have a logical or meaningful outcome in this context .
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scribd.com
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Java Increment and Decrement Operators | PDF | Integer (Computer ...
In a Java program involving multiple operations with increment and decrement operators, how does evaluating an expression like 'int x = 4; System.out.println(--x + x++ + ++x);' help demonstrate operator precedence and associativity?
In the expression 'int x = 4; System.out.println(--x + x++ + ++x);', the evaluation reflects Java's operator precedence and associativity. --x decrements x from 4 to 3, which is used first. Next, x++ uses x as 3 and then increments it to 4. Finally, ++x increments x to 5 and uses it. The expression evaluates as 3 + 3 + 5, resulting in 11. This showcases operators being applied in a specific order according to precedence and associativity rules, critical for determining expression outcomes .
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scribd.com
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Java Increment and Decrement Operators | PDF | Integer (Computer ...
How does the order of operations affect the result when multiple increment and decrement operators are used in a single Java expression, such as 'int a = 5; int b = a++ + ++a - --a + a--; System.out.println(b);'?
In the expression 'int a = 5; int b = a++ + ++a - --a + a--;', the operations occur as follows: a++ uses a=5, then increments a to 6; ++a increments a to 7 and uses 7; --a decrements a to 6 and uses 6; a-- uses a=6, then decrements a to 5. Thus, the calculation is 5 (from a++) + 7 (from ++a) - 6 (from --a) + 6 (from a--) = 12. Therefore, 12 is assigned to b, which is subsequently printed .
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scribd.com
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Java Increment and Decrement Operators | PDF | Integer (Computer ...
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GeeksforGeeks
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Interesting facts about Increment and Decrement operators in Java - GeeksforGeeks
September 11, 2024 - Increment and Decrement Operators can not be applied to boolean. Let us discuss these 4 facts as listed above and do implement them as follows: ... We can apply ++ and -- operator only for variables but not for the constant values. If we are trying to apply ++ and -- operator on the constant value then we will get a compile-time error which we will be seeing in example 1B after the below example as follows: ... // Java program to illustrate Increment // and Decrement Operators // Can be Applied to Variables Only // Main class public class GFG { // main driver method public static void main(String[] args) { int a = 10; int b = ++a; // Printing value inside variable System.out.println(b); } }
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Tutorial Gateway
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Increment and Decrement Operators in Java
March 26, 2025 - This program allows the user to enter two integer variables i and j. Next, we use these two variables to display the functionality of Increment and Decrement Operators. package JavaOperators; import java.util.Scanner; public class IncrementandDecrement { private static Scanner sc; public static void main(String[] args) { int i, j; sc = new Scanner(System.in); System.out.println(" Please Enter two integer Value: "); i = sc.nextInt(); j = sc.nextInt(); System.out.println("----INCREMENT OPERATOR EXAMPLE---- \n"); System.out.format(" Value of i : %d \n", i); //Original Value System.out.format(" Va
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CodeGym
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Increment and Decrement Unary Operators in Java
The syntax for decrement operator in Java is a pair of negative signs ie; --x; x--; Just like the increment operator, the decrement (--) operator can also be applied before and after the variable. Both will result in the same decrement of 1.
Published ย  December 5, 2024
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Scribd
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Java Increment and Decrement Operators | PDF | Integer (Computer Science) | Computer Programming
This document is a Java worksheet focused on increment (++) and decrement (--) operators, designed for Class 9 and Class 10 students. It includes concept review questions, output prediction exercises, coding practice tasks, and challenge questions to enhance understanding of these operators.
Find elsewhere
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Oracle
blogs.oracle.com โ€บ javamagazine โ€บ java-increment-decrement-operators
Quiz yourself: Understanding the syntax of Javaโ€™s increment and decrement operators | javamagazine
January 9, 2023 - And, in the same way that you cannot write 3++ (where would you store the result?), you cannot increment or decrement such a simple expression. The parenthetical (i--) cannot store the result. Consequently line 4 is syntactically invalid and would not compile. Line 5 is syntactically valid. If i were not null, that line would reassign i to an Integer representing one less than the previous object it referred to, then apply the (no-effect) unary plus operator, and then assign that same result to the value i.
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Freejavaguide
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Increment & decrement operators - Java tutorial | freejavaguide.com
class CountToTwenty { public static void main (String args[]) { int i; for (i=0; i <=20; i += 2) { //Note Increment Operator by 2 System.out.println(i); } } //main ends here } As you might guess there is a corresponding -= operator. If we wanted to count down from twenty to zero by twos we could write: -= class CountToZero { public static void main (String args[]) { int i; for (i=20; i >= 0; i -= 2) { //Note Decrement Operator by 2 System.out.println(i); } } } ... Copyright ยฉ 2006-2009 Free Java Guide & Tutorials.
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Codefinity
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Learn Increment and Decrement | Loops
In the first for loop, the variable i is initialized to 0, incremented by 1 after each iteration, and the loop executes until i is no longer less than 5. This will output the numbers from 0 to 4. In the second for loop, the variable j is initialized ...
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Sololearn
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novice Java question (increment and decrement basics) | Sololearn: Learn to code for FREE!
Saying x++ means to return the value of x first 'then' increment (++) it after, thus x++. โ‡จ Things to Remember: The prefix and postfix increment both increase the value of a number by 1. The only difference between the two is their return value.
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Baeldung
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A Guide to Increment and Decrement Unary Operators in Java | Baeldung
February 17, 2025 - In this quick tutorial, we learned about the increment and decrement unary operators in Java. Moreover, we looked at their two forms: prefix and postfix.
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Codedamn
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Increment (++) and Decrement (โ€“) Operators in Java Explained
June 25, 2023 - The increment (++) and decrement (โ€“) operators are unary operators in Java, which means they operate on a single operand. They are used to increase or decrease the value of an integer, floating-point, or character variable by 1.
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Dummies
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Increment and Decrement Operators in Java | dummies
July 1, 2025 - If you place an increment or decrement operator before its variable, the operator is applied before the rest of the expression is evaluated. If you place the operator after the variable, the operator is applied after the expression is evaluated.
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W3Schools
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Java Arithmetic Operators
Incrementing and decrementing are ... you will learn more about in later chapters). The ++ operator increases a value by 1, while the -- operator decreases a value by 1:...
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Medium
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Java 8 | Increment / Decrement Operator | by Student Kim | Buzz Code | Medium
January 11, 2021 - And then if I printed the ++a, It changed aโ€™s value into 11 first, and then operated the println() method with the new value, so it printed 11. Same with the pre-decrement operator here, it changed aโ€™s value back to 10, and print it out. Letโ€™s see the example of the Post-Increment/Decrement Operators too.
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Tpoint Tech
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Increment and Decrement Operators Questions in Java - Tpoint Tech
March 17, 2025 - Java, a versatile and widely-used programming language, provides developers with a variety of tools and operators to manipulate data efficiently.
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Medium
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Decrement and Increment Operators in JAVA | by Anna Scott | Medium
October 7, 2021 - Decrement and Increment Operators in JAVA Java has a number of operators for working with variables. Summary of Operators The Java Tutorials have been written for JDK 8. Examples and practices โ€ฆ