How to use Java language operators

How to use Java language operators

As a high-level programming language, Java provides a rich set of operators to implement various mathematical, logical and bit operations. Mastering the use of these operators is one of the foundations of Java programming, so in this article, we will introduce the specific usage of common operators in the Java language.

1. Arithmetic operators:

Arithmetic operators are the most common type of operators in the Java language, including operations such as addition, subtraction, multiplication, division, and modulo. The specific operators and usage methods are as follows:

1. Addition operator:

The addition operator is used to add two numbers, which can be two numbers or two strings. . For example:

int a = 5;
int b = 3;
int c = a b; // The value of c is 8

String str1 = "Hello";
String str2 = "world";
String str3 = str1 str2; // The value of str3 is "Hello world"

2. Subtraction operator: -

Subtraction operator Used to subtract two numbers, for example:

int a = 5;
int b = 3;
int c = a - b; // The value of c is 2

3. Multiplication operator: *

The multiplication operator is used to multiply two numbers, for example:

int a = 5;
int b = 3;
int c = a * b; // The value of c is 15

4. Division operator: /

The division operator is used to divide two numbers, for example:

int a = 5;
int b = 3;
int c = a / b; // The value of c is 1

It should be noted that when the divisor is 0, it will An ArithmeticException occurs.

5. Modulo operator: %

The modulo operator is used to find the remainder after dividing two numbers, for example:

int a = 5;
int b = 3;
int c = a % b; // The value of c is 2

2. Relational operators:

Relational operators are used to determine two operations A relation to an object, usually returning a Boolean value. The specific operators and usage methods are as follows:

1. Greater than operator: >

The greater than operator is used to determine whether the operand on the left is greater than the operand on the right, for example:

int a = 5;
int b = 3;
boolean result = a > b; // The value of result is true

2. Less than operator: < ;

The less than operator is used to determine whether the operand on the left is less than the operand on the right, for example:

int a = 5;
int b = 3;
boolean result = a < b; //The value of result is false

3. Greater than or equal to operator: >=

The greater than or equal to operator is used to determine the operation on its left side Whether the number is greater than or equal to the operand on the right, for example:

int a = 5;
int b = 3;
boolean result = a >= b; // The value of result is true

4. Less than or equal to operator: <=

The less than or equal to operator is used to determine whether the operand on its left side is less than or equal to the operand on its right side, for example:

int a = 5;
int b = 3;
boolean result = a <= b; //The value of result is false

5.Equality operator: ==

The equal operator is used to determine whether two operands are equal, for example:

int a = 5;
int b = 5;
boolean result = a == b; / /The value of result is true

It should be noted that when the operand is an object, its corresponding equals() method needs to be used for comparison.

6. Not equal to operator: !=

The not equal to operator is used to determine whether two operands are not equal, for example:

int a = 5;
int b = 3;
boolean result = a != b; //The value of result is true

3. Logical operators:

Logical operators are used to connect two One or more Boolean expressions, returning a Boolean value. The specific operators and usage methods are as follows:

1. Logical AND operator: &&

The logical AND operator is used to connect two Boolean expressions, only when both Boolean values ​​are true , the value of the entire expression is true, for example:

boolean a = true;
boolean b = false;
boolean result = a && b; // The value of result is false

2. Logical OR operator: ||

The logical OR operator is used to connect two Boolean expressions. As long as one of the Boolean values ​​​​is true, the value of the entire expression is true. For example:

boolean a = true;
boolean b = false;
boolean result = a || b; // The value of result is true

3. Logical NOT operation Symbol: !

The logical NOT operator is used to negate a Boolean expression, for example:

boolean a = true;
boolean result = !a; // The value of result is false

4. Bit operators:

Bit operators are used to operate on binary bits, including bitwise AND, bitwise OR, bitwise negation and other operations. The specific operators and usage methods are as follows:

1. Bitwise AND operator: &

The bitwise AND operator is used to perform a bitwise AND operation on the binary bits of two operands. For example:

int a = 5; // Binary is 0101
int b = 3; // Binary is 0011
int result = a & b; // The value of result is 0001, that is Binary 1

2. Bitwise OR operator: |

The bitwise OR operator is used to perform a bitwise OR operation on the binary bits of two operands, for example:

int a = 5; // Binary is 0101
int b = 3; // Binary is 0011
int result = a | b; // The value of result is 0111, which is 7## in binary

#3. Bitwise negation operator: ~

The bitwise negation operator is used to perform a bitwise negation operation on the binary bits of the operand, for example:

int a = 5; // Binary is 0101

int result = ~a; // The value of result is 1010, which is -6
in binary

It should be noted that in Java, bitwise operators can only be used for integer types. For other types of operands, type conversion needs to be performed first.

To sum up, the use of Java language operators is one of the knowledge points that must be mastered in Java programming. Mastering the usage of these operators can make it easier for programmers to perform various mathematical, logical and bit operations during the development process.

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