Java 演示使用二进制字面量

二进制字面量是使用二进制位0和1来表示的数字。在数据类型byte、int、long和short中，可以很容易地用二进制数系统表示数值。

在整数前面加上0b或0B来声明一个二进制字面量。

让我们看一些示例以更好地理解这个主题。

示例

以下程序显示了分配二进制字面量值的byte数据类型的值。在BinaryLiteral1类中声明了2字节数据类型变量，并分配了二进制字面量值，然后显示出来。

public class BinaryLiteral1 {
   public static void main(String[] args) {
      // Binary literal in a byte type
      byte bt1 = 0b1001; // Using upper case 0b
      byte bt2 = 0B1001; // Using lower case 0B
      System.out.println("Illustrating the usage of Binary Literal in Byte data type");
      System.out.println("Value of variable bt1 = "+bt1);
      System.out.println("Value of variable bt2 = "+bt2);
   }
}

输出

Illustrating the usage of Binary Literal in Byte data type
Value of variable bt1 = 9
Value of variable bt2 = 9

示例

以下程序显示了一个short数据类型的值，其中被赋予了二进制形式的值。在一个名为BinaryLiteral2的类中声明了两个short数据类型的变量，并赋予了二进制字面值，并将其显示出来。

public class BinaryLiteral2 {
   public static void main(String[] args) {
      // Binary literal in short type
      short n1 = 0b1001; // Using upper case b0
      short n2 = 0B1001; // Using lower case B0
      System.out.println("Illustrating the usage of Binary Literal in short data type");
      System.out.println("The value of variable n1 = "+n1);  
      System.out.println("The value of variable n2 = "+n2);   
   }
}

输出

Illustrating the usage of Binary Literal in short data type
The value of variable n1 = 9
The value of variable n2 = 9

示例

以下程序显示了将二进制字面值赋给int数据类型的值。在一个名为BinaryLiteral3的类内部，声明了两个int数据类型的变量，并分配了二进制字面值，然后将它们显示出来。

public class BinaryLiteral3 {
   public static void main(String[] args) {
      // Binary literal in int type
      int n1 = 0b1001; 
      // Usage of upper case b
      int n2 = 0B1001; 
      // Usage of lower-case B
      System.out.println("Illustrating the usage of Binary Literal in int data type");
      System.out.println("The value of variable st1 = "+n1);  
      System.out.println("The value of variable st2 = "+n2);  

    }
}

输出

Illustrating the usage of Binary Literal in int data type
The value of variable st1 = 9
The value of variable st2 = 9

示例

下面的程序显示了一个long数据类型的值，该值被赋予了一个二进制字面量。创建了一个名为BinaryLiteral4的类，在其中声明了2个long数据类型的变量，并赋予了二进制字面量的值，然后将它们显示出来。

public class BinaryLiteral4 {
   public static void main(String[] args) {
      // Binary literal in long type
      long n1 = 0b1001;    // Using upper case b0
      long n2 = 0B1001;    // Using lower case B0
      System.out.println("Illustrating the usage of Binary Literal in long data type");
      System.out.println("The value of variable n1 = "+n1);  
      System.out.println("The value of variable n2 = "+n2);  

   }
}

输出

Illustrating the usage of Binary Literal in long data type
The value of variable n1 = 9
The value of variable n2 = 9

示例

以下 Java 程序展示了如何对二进制字面量进行数学运算。在 BinaryLiteral5 类中执行了对正负二进制字面量的不同数学操作。

public class BinaryLiterals5 {  
   public static void main(String[] args) {
      // Declaring a decimal value 
      byte n1 = 26;  
      // Declaring a positive binary literal
      byte n2 = 0b1001;      
      // Declaring a negative binary literal
      byte n3 = -0b1001;  
      // Declaring a negative binary literal Using an underscore 
      byte n4 = -0b1001_0;  
      // Declaring a positive binary literal using an underscore 
      byte n5 = 0b1001_00;  
      // Declaring a positive binary literal using an underscore 
      byte n6 = 0b101_00;  
      //displaying the values of above declared variables
      System.out.println(" The value of variable n1 = "+n1);  
      System.out.println("The value of variable n2 = "+n2);  
      System.out.println("The value of variable n3 = "+n3);  
      System.out.println("The value of variable n4 = "+n4);  
      System.out.println("The value of variable n5 = "+n5);
      System.out.println("The value of variable n6 = "+n6);

      // Check if the binary values present in n2 and n3 are equal   
      System.out.println(" Are the values of n2 and n3 same: "+(n2 == n3));  
      // Performing mathematical operations on binary values  
      System.out.println("n2 + 1 = "+(n2 + 1));  
      System.out.println("n2 - 1 = "+(n2 - 1));  
      System.out.println("n3 * 2 = "+(n3 * 2));  
      System.out.println("n3 / 2 = "+(n5 / n4)); 
      System.out.println("n5 - n6 = "+(n5 - n6));  
   }
}

输出

The value of variable n1 = 26
The value of variable n2 = 9
The value of variable n3 = -9
The value of variable n4 = -18
The value of variable n5 = 36
The value of variable n6 = 20
 Are the values of n2 and n3 same: false
n2 + 1 = 10
n2 - 1 = 8
n3 * 2 = -18
n3 / 2 = -2
n5 - n6 = 16