Java 一元运算符示例
运算符 构成了任何编程语言的基本构件。Java 也提供了许多类型的运算符，可以根据需要使用它们来执行各种计算和功能，包括逻辑、算术、关系等。它们根据提供的功能进行分类。这里有几种类型:
- arithmetic operator
- Unary operator
- assigning operator
- relational operator
- logical operator
- ternary operator
- Bitwise operator
- Shift operator
Java 中的一元运算符
Java 一元运算符是只需要一个操作数来执行任何操作的类型，如递增、递减、求反等。它由对单个操作数进行运算的各种算术、逻辑和其他运算符组成。让我们详细看看各种一元运算符，看看它们是如何操作的。
运算符 1: 一元减号(-)
该运算符可用于将负值转换为正值。
语法:
~(operand)
插图:
a = -10
示例:
Java
// Java Program to Illustrate Unary - Operator
// Importing required classes
import java.io.*;
// Main class
class GFG {
// Main driver method
public static void main(String[] args)
{
// Declaring a custom variable
int n1 = 20;
// Printing the above variable
System.out.println("Number = " + n1);
// Performing unary operation
n1 = -n1;
// Printing the above result number
// after unary operation
System.out.println("Result = " + n1);
}
}
输出
Number = 20
Result = -20
运算符 2: “非”运算符(！)
这用于将真转换为假，反之亦然。基本上，它颠倒了操作数的逻辑状态。
语法:
!(operand)
插图:
cond = !true;
*// cond < false*
例:
爪哇
// Java Program to Illustrate Unary NOT Operator
// Importing required classes
import java.io.*;
// Main class
class GFG {
// Main driver method
public static void main(String[] args)
{
// Initializing variables
boolean cond = true;
int a = 10, b = 1;
// Displaying values stored in above variables
System.out.println("Cond is: " + cond);
System.out.println("Var1 = " + a);
System.out.println("Var2 = " + b);
// Displaying values stored in above variables
// after applying unary NOT operator
System.out.println("Now cond is: " + !cond);
System.out.println("!(a < b) = " + !(a < b));
System.out.println("!(a > b) = " + !(a > b));
}
}
输出:
Cond is: true
Var1 = 10
Var2 = 1
Now cond is: false
!(a < b) = true
!(a > b) = false
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