Comparison operators in java w3schools

Comparison operators in java w3schools

I'm happy to help!

Comparison Operators in Java:

Java provides several comparison operators that are used to compare values and determine the relationship between them. Here's a list of all the available comparison operators in Java, along with their meanings:

The == operator checks if two variables or expressions have the same value. If they are equal, it returns true.

Example: a == b

The != operator checks if two variables or expressions do not have the same value. If they are not equal, it returns true.

Example: a != b

The < operator checks if the left operand is less than the right operand.

Example: a < b

The > operator checks if the left operand is greater than the right operand.

Example: a > b

The <= operator checks if the left operand is less than or equal to the right operand.

Example: a <= b

The >= operator checks if the left operand is greater than or equal to the right operand.

Example: a >= b

This operator is equivalent to !=.

Example: a <> b

The === operator checks if two object references are pointing to the same object.

Example: obj1 === obj2

This operator is equivalent to != for objects only.

Example: obj1 !== obj2

Here's an example of how these operators can be used in a Java program:

public class ComparisonOperators {
public static void main(String[] args) {
int a = 5;
int b = 3;
// Equal
if (a == b) {
System.out.println("a is equal to b");
} else {
System.out.println("a is not equal to b");
}
// Not Equal
if (a != b) {
System.out.println("a is not equal to b");
} else {
System.out.println("a is equal to b");
}
// Less Than
if (a < b) {
System.out.println("a is less than b");
} else {
System.out.println("a is greater than or equal to b");
}
// Greater Than
if (a > b) {
System.out.println("a is greater than b");
} else {
System.out.println("a is less than or equal to b");
}
// Less Than or Equal
if (a <= b) {
System.out.println("a is less than or equal to b");
} else {
System.out.println("a is greater than b");
}
// Greater Than or Equal
if (a >= b) {
System.out.println("a is greater than or equal to b");
} else {
System.out.println("a is less than b");
}
}
}

For more information on comparison operators in Java, please refer to the W3Schools' tutorial: https://www.w3schools.com/java/java_comparators.asp

References:

What is the += operator in Java?

The += operator in Java! It's a fundamental part of the language that allows you to perform a wide range of operations, and it's used extensively throughout your code.

So, what exactly does the += operator do? Well, at its core, it's an assignment operator that combines the operation of addition or concatenation (depending on whether you're working with numbers or strings) with assigning the result back into the original variable. Yeah, I know - it sounds like a mouthful! But bear with me, and I'll try to break it down in a way that makes sense.

When you use += with integers, it performs a simple addition operation. For example:

int x = 5;
x += 3; // same as saying x = x + 3;
System.out.println(x); // outputs 8

In this example, the value of x is initially set to 5. When you use the += operator with x and 3, it adds those two numbers together and assigns the result back into x. So, after this operation, x has a value of 8.

But that's not all! The += operator also works with strings, arrays, and objects. In these cases, it performs a concatenation operation rather than addition. For example:

String name = "John";
name += " Doe"; // same as saying name = name + " Doe";
System.out.println(name); // outputs "John Doe"

In this case, the += operator takes the string "John" and appends the string " Doe" to it. The result is a new string that contains both original strings.

The += operator also works with arrays and objects. For example:

int[] scores = { 90, 80, 70 };
scores += new int[] { 60, 50 }; // same as saying scores = scores + new int[] { 60, 50 };
System.out.println(Arrays.toString(scores));

In this case, the += operator takes the existing array of scores and appends a new array to it.

Now, I know what you're thinking - what if I want to perform some more complex operation? Can the += operator handle that?

The answer is... sort of. While the += operator can't perform arbitrary calculations or operations, it does support certain built-in operations like arithmetic operations and method calls. For example:

int x = 5;
x += 3 + 2; // same as saying x = x + (3 + 2);
System.out.println(x); // outputs 10
String name = "John";
name += String.format(" %s, ", "Doe"); // same as saying name = name + String.format(" %s, ", "Doe");
System.out.println(name); // outputs "John, Doe"

In these examples, the += operator is used to combine arithmetic operations and method calls. The result is a more complex operation that can be performed in a single line of code.

So there you have it - the += operator in Java! It's a powerful tool that allows you to perform a wide range of operations in your code, from simple assignments to complex calculations. With practice and patience, you'll become a master of this operator and use it to write more efficient, readable, and maintainable code.