the assignment statement in java

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1.7 Java | Assignment Statements & Expressions

An assignment statement designates a value for a variable. An assignment statement can be used as an expression in Java.

After a variable is declared, you can assign a value to it by using an assignment statement . In Java, the equal sign = is used as the assignment operator . The syntax for assignment statements is as follows:

An expression represents a computation involving values, variables, and operators that, when taking them together, evaluates to a value. For example, consider the following code:

You can use a variable in an expression. A variable can also be used on both sides of the = operator. For example:

In the above assignment statement, the result of x + 1 is assigned to the variable x . Let’s say that x is 1 before the statement is executed, and so becomes 2 after the statement execution.

To assign a value to a variable, you must place the variable name to the left of the assignment operator. Thus the following statement is wrong:

Note that the math equation x = 2 * x + 1 ≠ the Java expression x = 2 * x + 1

Java Assignment Statement vs Assignment Expression

Which is equivalent to:

And this statement

is equivalent to:

Note: The data type of a variable on the left must be compatible with the data type of a value on the right. For example, int x = 1.0 would be illegal, because the data type of x is int (integer) and does not accept the double value 1.0 without Type Casting .

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Java Assignment Operators with Examples

Operators constitute the basic building block of any programming language. Java too provides many types of operators which can be used according to the need to perform various calculations and functions, be it logical, arithmetic, relational, etc. They are classified based on the functionality they provide.

Types of Operators:

Arithmetic Operators
Unary Operators
Assignment Operator
Relational Operators
Logical Operators
Ternary Operator
Bitwise Operators
Shift Operators

This article explains all that one needs to know regarding Assignment Operators.

Assignment Operators

These operators are used to assign values to a variable. The left side operand of the assignment operator is a variable, and the right side operand of the assignment operator is a value. The value on the right side must be of the same data type of the operand on the left side. Otherwise, the compiler will raise an error. This means that the assignment operators have right to left associativity, i.e., the value given on the right-hand side of the operator is assigned to the variable on the left. Therefore, the right-hand side value must be declared before using it or should be a constant. The general format of the assignment operator is,

Types of Assignment Operators in Java

The Assignment Operator is generally of two types. They are:

1. Simple Assignment Operator: The Simple Assignment Operator is used with the “=” sign where the left side consists of the operand and the right side consists of a value. The value of the right side must be of the same data type that has been defined on the left side.

2. Compound Assignment Operator: The Compound Operator is used where +,-,*, and / is used along with the = operator.

Let’s look at each of the assignment operators and how they operate:

1. (=) operator:

This is the most straightforward assignment operator, which is used to assign the value on the right to the variable on the left. This is the basic definition of an assignment operator and how it functions.

Syntax:

Example:

2. (+=) operator:

This operator is a compound of ‘+’ and ‘=’ operators. It operates by adding the current value of the variable on the left to the value on the right and then assigning the result to the operand on the left.

Note: The compound assignment operator in Java performs implicit type casting. Let’s consider a scenario where x is an int variable with a value of 5. int x = 5; If you want to add the double value 4.5 to the integer variable x and print its value, there are two methods to achieve this: Method 1: x = x + 4.5 Method 2: x += 4.5 As per the previous example, you might think both of them are equal. But in reality, Method 1 will throw a runtime error stating the “i ncompatible types: possible lossy conversion from double to int “, Method 2 will run without any error and prints 9 as output.

Reason for the Above Calculation

Method 1 will result in a runtime error stating “incompatible types: possible lossy conversion from double to int.” The reason is that the addition of an int and a double results in a double value. Assigning this double value back to the int variable x requires an explicit type casting because it may result in a loss of precision. Without the explicit cast, the compiler throws an error. Method 2 will run without any error and print the value 9 as output. The compound assignment operator += performs an implicit type conversion, also known as an automatic narrowing primitive conversion from double to int . It is equivalent to x = (int) (x + 4.5) , where the result of the addition is explicitly cast to an int . The fractional part of the double value is truncated, and the resulting int value is assigned back to x . It is advisable to use Method 2 ( x += 4.5 ) to avoid runtime errors and to obtain the desired output.

Same automatic narrowing primitive conversion is applicable for other compound assignment operators as well, including -= , *= , /= , and %= .

3. (-=) operator:

This operator is a compound of ‘-‘ and ‘=’ operators. It operates by subtracting the variable’s value on the right from the current value of the variable on the left and then assigning the result to the operand on the left.

4. (*=) operator:

This operator is a compound of ‘*’ and ‘=’ operators. It operates by multiplying the current value of the variable on the left to the value on the right and then assigning the result to the operand on the left.

5. (/=) operator:

This operator is a compound of ‘/’ and ‘=’ operators. It operates by dividing the current value of the variable on the left by the value on the right and then assigning the quotient to the operand on the left.

6. (%=) operator:

This operator is a compound of ‘%’ and ‘=’ operators. It operates by dividing the current value of the variable on the left by the value on the right and then assigning the remainder to the operand on the left.

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Operators in Java

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Operators constitute the basic building block to any programming language. Java too provides many types of operators which can be used according to the need to perform various calculations and functions, be it logical, arithmetic, relational, etc. They are classified based on the functionality they 6 min read
Operators constitute the basic building block of any programming language. Java too provides many types of operators which can be used according to the need to perform various calculations and functions, be it logical, arithmetic, relational, etc. They are classified based on the functionality they 7 min read
Operators constitute the basic building block to any programming language. Java too provides many types of operators which can be used according to the need to perform various calculations and functions be it logical, arithmetic, relational, etc. They are classified based on the functionality they p 8 min read
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Operators constitute the basic building block of any programming language. Java provides many types of operators that can be used according to the need to perform various calculations and functions, be it logical, arithmetic, relational, etc. They are classified based on the functionality they provi 4 min read
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Multi-threading in Java

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A thread in Java at any point of time exists in any one of the following states. A thread lies only in one of the shown states at any instant: New StateRunnable StateBlocked StateWaiting StateTimed Waiting StateTerminated StateThe diagram shown below represents various states of a thread at any inst 6 min read
Java provides built-in support for multithreaded programming. A multi-threaded program contains two or more parts that can run concurrently. Each part of such a program is called a thread, and each thread defines a separate path of execution.When a Java program starts up, one thread begins running i 4 min read
As we already know java being completely object-oriented works within a multithreading environment in which thread scheduler assigns the processor to a thread based on the priority of thread. Whenever we create a thread in Java, it always has some priority assigned to it. Priority can either be give 5 min read
Background Server Programs such as database and web servers repeatedly execute requests from multiple clients and these are oriented around processing a large number of short tasks. An approach for building a server application would be to create a new thread each time a request arrives and service 9 min read
Multi-threaded programs may often come to a situation where multiple threads try to access the same resources and finally produce erroneous and unforeseen results. Why use Java Synchronization?Java Synchronization is used to make sure by some synchronization method that only one thread can access th 5 min read
Threads communicate primarily by sharing access to fields and the objects reference fields refer to. This form of communication is extremely efficient, but makes two kinds of errors possible: thread interference and memory consistency errors. Some synchronization constructs are needed to prevent the 7 min read
Our systems are working in a multithreading environment that becomes an important part for OS to provide better utilization of resources. The process of running two or more parts of the program simultaneously is known as Multithreading. A program is a set of instructions in which multiple processes 10 min read
As we know Java has a feature, Multithreading, which is a process of running multiple threads simultaneously. When multiple threads are working on the same data, and the value of our data is changing, that scenario is not thread-safe and we will get inconsistent results. When a thread is already wor 5 min read
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Assignment Statements and Assignment Expressions

An assignment statement designates a value for a variable. An assignment statement can be used as an expression in Java. After a variable is declared, you can assign a value to it by using an assignment statement . In Java, the equal sign ( = ) is used as the assignment operator. The syntax for assignment statements is as follows:

An expression represents a computation involving values, variables, and operators that, taking them together, evaluates to a value. For example, consider the following code:

You can use a variable in an expression. A variable can also be used in both sides of the = operator. For example,

In this assignment statement, the result of x + 1 is assigned to x . If x is 1 before the statement is executed, then it becomes 2 after the statement is executed. To assign a value to a variable, you must place the variable name to the left of the assignment operator. Thus, the following statement is wrong:

In mathematics, x = 2 * x + 1 denotes an equation. However, in Java, x = 2 * x + 1 is an assignment statement that evaluates the expression 2 * x + 1 and assigns the result to x .

In Java, an assignment statement is essentially an expression that evaluates to the value to be assigned to the variable on the left side of the assignment operator. For this reason, an assignment statement is also known as an assignment expression . For example, the following statement is correct:

which is equivalent to

If a value is assigned to multiple variables, you can use this syntax:

In an assignment statement, the data type of the variable on the left must be compatible with the data type of the value on the right. For example, int x = 1.0 would be illegal, because the data type of x is int . You cannot assign a double value ( 1.0 ) to an int variable without using type casting.

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Java Assignment Operators

Java programming tutorial index.

The Java Assignment Operators are used when you want to assign a value to the expression. The assignment operator denoted by the single equal sign = .

In a Java assignment statement, any expression can be on the right side and the left side must be a variable name. For example, this does not mean that "a" is equal to "b", instead, it means assigning the value of 'b' to 'a'. It is as follows:

Java also has the facility of chain assignment operators, where we can specify a single value for multiple variables.

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Java Assignment Statement

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In this tutorial, we will learn about Java Assignment Statement. We can assign or give value to a variable using the assignment statement.

The general syntax for assigning a value to a variable is as follows:

variable_name = value;

We can also assign value to a variable as part of the declaration. This is known as variable initialization. The syntax for the variable initialization is:

Datatype variable_name = value;

To assign a value of 72 to a variable named length :

// assign a value to the variable

length = 72;

For example, to initialize a variable width to 6.2:

//declare and initialize the variable

float width = 6.2;

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Improving java performance with multithreading.

Improving Java Performance with Multithreading This article will go through how multithreading may be utilized to boost Java performance. Java is a widely used programming language for creating complicated programs. It’s well-known for its scalability, reliability, and security. But, as modern applications get more complicated, the performance of Java applications has become a key problem. […]

Java Incremental Operator

Java Incremental Operator In Java, the incremental operator( ++ ) is used to increase the value of a variable by 1. Java provides two types of incremental operators: Post-Increment: The value is used first, then it is incremented. For example: var++ Pre-Increment: The value is incremented first, then it is used. For example: ++var Example […]

Java Garbage Collection

Java Garbage Collection In Java, garbage collection is a process by which the Java Virtual Machine (JVM) automatically manages memory. In some languages, such as C++, dynamically allocated objects must be manually released by using the delete operator. What is Garbage Collection? Garbage collection (GC) is the process of identifying and disposing of objects that are […]

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1.4. Expressions and Assignment Statements
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1.7 Java | Assignment Statements & Expressions - The Revisionist
In Java, an assignment statement is an expression that evaluates a value, which is assigned to the variable on the left side of the assignment operator. Whereas an assignment expression is the same, except it does not take into account the variable. That’s why the following statements are legal: System.out.println(x = 1); Which is equivalent to:
Java Assignment Operators with Examples - GeeksforGeeks
Sep 13, 2023 · Types of Assignment Operators in Java. The Assignment Operator is generally of two types. They are: 1. Simple Assignment Operator: The Simple Assignment Operator is used with the “=” sign where the left side consists of the operand and the right side consists of a value. The value of the right side must be of the same data type that has ...
Java: define terms initialization, declaration and assignment
Assignment - This is when you stuff a value into the previously declared variable. Assignment is associated with the 'equals sign'. In the previous example, the variable 'x' was assigned the value 8. Initialization - This is when a variable is preset with a value. There is no guarantee that a variable will every be set to some default value ...
What Is an Assignment Statement in Java? - Techwalla
When the assignment statement appears with object references, the assignment operation may also involve object instantiation. When Java code creates a new object instance of a Java class in an application, the "new" keyword causes the constructor method of the class to execute, instantiating the object.
1.4. Expressions and Assignment Statements — CS Java
In this lesson, you will learn about assignment statements and expressions that contain math operators and variables. 1.4.1. Assignment Statements¶ Remember that a variable holds a value that can change or vary. Assignment statements initialize or change the value stored in a variable using the assignment operator =. An assignment statement ...
The assignment statement - Department of Computer Science
The assignment statement 2 The rule for an assignment of an expression that is a number is that the type of the variable has to be at least as wide as the type of the expression. For example, if we have, if we have a byte variable b and an int variable i, both of which contain 0, it is legal to assign b to i but illegal to assign i to b. byte b= 0;
Assignment Statements and Assignment Expressions
Apr 24, 2024 · An assignment statement designates a value for a variable. An assignment statement can be used as an expression in Java. After a variable is declared, you can assign a value to it by using an assignment statement. In Java, the equal sign (=) is used as the assignment operator. The syntax for assignment statements is as follows:
Java Assignment Operators - W3Schools
In a Java assignment statement, any expression can be on the right side and the left side must be a variable name. For example, this does not mean that "a" is equal to "b", instead, it means assigning the value of 'b' to 'a'. It is as follows: Syntax: variable = expression; Example: int a = 6; float b = 6.8F;
Java Assignment Statement - TestingDocs.com
In this tutorial, we will learn about Java Assignment Statement. We can assign or give value to a variable using the assignment statement. Syntax. The general syntax for assigning a value to a variable is as follows: variable_name = value; We can also assign value to a variable as part of the declaration. This is known as variable initialization.
Assignment Operators in Java - Javatpoint">Types of Assignment Operators in Java - Javatpoint
In the above example, the variable x is assigned the value 10. Addition Assignment Operator (+=) To add a value to a variable and subsequently assign the new value to the same variable, use the addition assignment operator (+=).