How to interpret java operation symbols

Explanation of Java operation symbols: 1. Arithmetic operators; 2. Assignment operators; 3. Comparison operators; 4. Logical operators; 5. Conditional operators; 6. Bit operators; 7. String concatenation operator; 8. String concatenation during assignment; 9. Other special operators; 10. Type conversion operator; 11. Parentheses and order of operations. Detailed introduction: 1. Arithmetic operators, addition is used to add two numeric type variables, subtraction is used to subtract two numeric type variables, multiplication is used to multiply two numeric type variables, and division is used to multiply two numeric types. Type variables are divided and so on.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Java operators are symbols used to perform arithmetic operations, assignments, comparisons, and logical operations. The following is a detailed explanation of commonly used operators in Java:

1. Arithmetic operators:

• Addition ( ): used for variables of two numerical types Add up.
• Subtraction (-): used to subtract two numeric type variables.
• Multiplication (*): used to multiply two numeric type variables.
• Division (/): used to divide two numeric type variables. If two integers are divided, the result is still an integer; if one of the numbers is a decimal, the result is a decimal.
• Remainder (%): used to obtain the remainder after dividing two numerical type variables.

2. Assignment operator:

• Assignment (=): used to assign the value on the right to the variable on the left.
• Autoincrement ( ): Increase the value of the variable by 1. There are two forms: prefix increment (i) and suffix increment (i). The prefix form first increments and then returns the value, and the suffix form first returns the value and then increments.
• Decrement (--): Decrease the value of the variable by 1. There are also two forms: prefix decrement (--i) and suffix decrement (i--).

3. Comparison operators:

• Greater than (>): used to compare whether the left operand is greater than the right operand. The result is true or false.
• Less than (<): used to compare whether the left operand is smaller than the right operand, the result is true or false.
• Greater than or equal to (>=): used to compare whether the left operand is greater than or equal to the right operand, and the result is true or false.
• Less than or equal to (<=): used to compare whether the left operand is less than or equal to the right operand, and the result is true or false.
• Equal (==): used to compare whether two operands are equal, the result is true or false.
• Not equal to (!=): used to compare whether two operands are not equal, the result is true or false.

4. Logical operators:

• Logical AND (&&): When the operands on both sides are true, the result is true ; Otherwise, false. Also called short circuit AND.
• Logical OR (||): When one of the operands on both sides is true, the result is true; when both operands are false, the result is false. Also known as short circuit or.
• Logical NOT (!): used for negation operation. If the operand is true, the result is false; if the operand is false, the result is true.

5. Conditional (ternary) operator:

• The form is Condition ? Value 1 : Value 2. If the condition is true, the result is value 1, otherwise the result is value 2. Also known as the ternary operator.

6. Bitwise operators:

• Bitwise AND (&): The result is 1 only when the corresponding bits are all 1.
• Bitwise OR (|): As long as one of the corresponding bits is 1, the result is 1.
• Bitwise XOR (^): The result of the corresponding bit is 1 only when the two numbers are different.
• Bitwise inversion (~): Invert whether the corresponding bit is 0 or 1.

7. String connector ( ): can not only be used for addition between numbers, but also can be used to connect strings. For example, "Hello, " "world!" results in "Hello, world!".

8. String connection during assignment: For example, a = "string" is equivalent to a = a "string", that is, the variable a is connected to the string.

9. Other special operators: For example, instanceof is used to determine whether an object is an instance of a certain class, etc.

10. Type conversion operator: For example (int) or Integer.parseInt() and other methods are used for type conversion.

11. Parentheses and order of operations: Brackets can change the default order of operations, for example, the expression in the parentheses is calculated first. In addition, the left-to-right and top-to-bottom principles are also commonly used rules for the order of operations.

Additional notes on the "%" operator: In Java, "%" can not only be used for remainder operations, but can also be used to determine the parity of a number, determine whether a number can be divided, and take out The ones, tens, hundreds, etc. of any number. For example, x % 10 is used to get the ones digits, x / 10 % 10 is used to get the tens digits, etc. At the same time, when the number before "%" is less than the number after "%", the result is the number before "%".

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