Java 運算符

以下文章提供了 Java 運算符的概述。 Java 運算子表示一種有助於對一個或多個運算元執行多種運算的符號。運算符可以是 +、-、/、* 等，取決於需求。

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有不同類型的運算符。

• 算術運算子
• 位元運算子
• 賦值運算子
• 三元運算子
• 自增和自減運算子
• 比較運算子或關係運算子
• 邏輯運算子
• 輪班運算子

Java 中的運算子類型

下面給出了java中運算子的類型：

1.算術運算子

算術運算子用於執行多種算術運算。

以下是Java中的算術運算子。

Operator Name/ Symbol	Definition	Example
Addition(+)	It helps in adding two values.	A+B
Subtraction(-)	It helps in subtracting two values.	A-B
Modulus(%)	It helps in getting the remainder obtained by dividing two values.	A%B
Multiplication( * )	It helps in multiplying two values.	A*B
Division ( / )	Helps in dividing two values.	A/B

2.位元運算子

位元運算子常用於在 Java 中執行移位和位元運算。

以下是常用的位元運算子。

Operator Name/ Symbol	Definition	Example
Bitwise AND operator (&)	It helps in comparing 2 operand’s corresponding bits. 1 will be returned if both the bits are 1; else 0 will be returned.	A&B
Bitwise OR operator (|)	It helps in comparing 2 operand’s corresponding bits. 1 will be returned if one of the bit is 1; else 0 will be returned.	A|B
Bitwise XOR operator (^)	It helps in comparing 2 operand’s corresponding bits. 1 will be returned if the corresponding bits are dissimilar, else 0 will be returned.	A^B
Bitwise complement operator (~)	It helps in inverting the pattern of bits. That is, 1 will be changed to 0 and 0 will be changed to 1.	~B

3.賦值運算子

賦值運算子用於為某些變數賦值。

以下是Java中的賦值運算子。

Operator Name/ Symbol	Definition	Example
-=	It helps subtract the right and left operators, thereby assigning the obtained result to the operator on the left.	A-=B
/=	Helps in dividing the right and left operators and thereby assigning the obtained result to the operator in the left.	A/=B
*=	It helps multiply right and left operators and thereby assign the obtained result to the operator on the left.	A*=B
+=	It helps add right and left operators and thereby assign the obtained result to the operator on the left.	A+=B
^=	Left operand value will be raised to the right operator power.	A^=B
%=	A modulus operator will be applied.	A%=B

4.三元運算子

在Java中，三元運算子主要用於if-then-else條件替換。它是一種在 Java 程式設計中廣泛使用的單行語句，只需要 3 個運算元。

Operator Name/ Symbol	Definition	Example
condition?v1: v2	V1 will be returned if the condition mentioned is true, and v2 will be returned if the condition is false.	A>B?A:B

5.自動遞增運算子和自動遞減運算子

Java 中的自動遞增和自動遞減運算子有助於分別將值遞增和遞減 1。

Operator Name/ Symbol	Definition	Example
++	The value will be incremented by 1.	A++; It is similar to A+=1
—	The value will be decremented by 1.	A–; It is similar to A-=1

6.比較運算子或關係運算子

關係運算子是有助於檢查運算元是否相等的運算子。除此之外，這些運算子也用於比較 2 個或更多值。

Operator Name/ Symbol	Definition	Example
equals to(==)	If the left operand is equal to the right operand, true will be returned; else, false.	A==B
not equal to(!=)	If the left operand is not equal to the right operand, true will be returned; else, false.	A!=B
less than(<)	If the left operand is less than the right operand, true will be returned; else, false.	A
greater than(>)	If the left operand is greater than the right operand, true will be returned; else, false.	A>B
greater than or equal to(>=)	If the left operand is greater than or equal to the right operand, true will be returned else, false.	A>=B
Less than or equal to(<=)	If the left operand is less than or equal to the right operand, true will be returned else, false.	A<=B

7.邏輯運算子

Java 中的邏輯運算子常用於布林運算式。

下面是Java中的邏輯運算子。

Operator Name/ Symbol	Definition	Example
Conditional AND(&&)	If both the Boolean expressions are satisfied, true will be returned else, false.	AD
Conditional OR(||)	If any of the Boolean expression is satisfied, true will be returned; else, false.	AD
Logical NOT(!)	It helps in inverting the operand’s logical state. That is, 1 will be changed to 0 and 0 will be changed to 1.	!B

8.移位運算子

Java 中的移位運算子用於根據需要向左或向右移動位元。

以下是 Shift 運算子。

Operator Name/ Symbol	Definition	Example
Left Shift Operator ( << )	X in binary notation will be shifted y bits left by shifting the zeroes from the right.	A<<2
Right Shift Operator ( >> )	X in binary notation will be shifted y bits right by discarding shifted bits.	B>>2
Unsigned Right Shift Operator ( >>> )	X in binary notation will be shifted y bits right by discarding shifted bits and shifting the zeroes from the right.	A>>>2

讓我們看看這些運算子的優先順序如何。

Operator	Precedence
Postfix Operators	Exp++ Exp–
Unary Operators	++Exp –Exp +_Exp –Exp~ !
Multiplicative Operators	* / %
Additive Operators	+ –
Shift Operators	<< >> >>>
Relational Operators	< > <= >= instanceof
Equality Operators	== !=
Bitwise AND Operator	&
Bitwise exclusive OR Operator	^
Bitwise inclusive OR Operator	|
Logical AND Operator	&&
Logical OR Operator	||
Ternary Operators	?:
Assignment Operators	= += -= *= /= %= &= ^= |= <<= >>= >>>=

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