Java二进制字面量

本文概述

• 二进制字面量示例
• 二进制字面量示例2

Java在Java 7中添加了新功能Binary Literal。我允许你在二进制数字系统中表示整数类型（字节, 短型, 整型和长型）。要指定二进制字面量, 请将前缀0b或0B添加到整数值。

在下面的示例中, 我们从整数值创建二进制字面量。

二进制字面量示例

public class BinaryLiteralsExample {
	public static void main(String[] args) {
		// Binary literal in byte type
		byte b1 = 0b101;	// Using b0, The b can be lower or upper case
		byte b2 = 0B101;	// Using B0
		System.out.println("----------Binary Literal in Byte----------------");
		System.out.println("b1 = "+b1);
		System.out.println("b2 = "+b2);
		
		// Binary literal in short type
		short s1 = 0b101;	// Using b0, The b can be lower or upper case
		short s2 = 0B101;	// Using B0
		System.out.println("----------Binary Literal in Short----------------");
		System.out.println("s1 = "+s1);
		System.out.println("s2 = "+s2);
		
		// Binary literal in int type
		int i1 = 0b101;		// Using b0, The b can be lower or upper case
		int i2 = 0B101;		// Using B0
		System.out.println("----------Binary Literal in Integer----------------");
		System.out.println("i1 = "+i1);
		System.out.println("i2 = "+i2);
		
		// Binary literal in long type
		long l1 = 0b0000011111100001;	// Using b0, The b can be lower or upper case
		long l2 = 0B0000011111100001;	// Using B0
		System.out.println("----------Binary Literal in Long----------------");
		System.out.println("l1 = "+l1);
		System.out.println("l2 = "+l2);
	}
}

输出：

----------Binary Literal in Byte----------------
b1 = 5
b2 = 5
----------Binary Literal in Short----------------
s1 = 5
s2 = 5
----------Binary Literal in Integer----------------
i1 = 5
i2 = 5
----------Binary Literal in Long----------------
l1 = 2017
l2 = 2017

二进制字面量示例2

在此示例中, 我们使用二进制字面量中的下划线并进行操作来创建负二进制。

public class BinaryLiteralsExample {
	public static void main(String[] args) {
		byte b1 = 5; // a decimal value
		// Using binary of 5
		byte b2 = 0b101;	// using b0, The b can be lower or upper case
		// Declaring negative binary
		byte b3 = -0b101;
		// Using underscore in binary literal
		byte b4 = 0b101_0;
		System.out.println("b1 = "+b1);
		System.out.println("b2 = "+b2);
		System.out.println("b3 = "+b3);
		System.out.println("b4 = "+b4);
		// Check whether binary and decimal are equal 
		System.out.println("is b1 and b2 equal: "+(b1==b2));
		// Perform operation on binary value
		System.out.println("b2 + 1 = "+(b2+1));
		// Perform operation on negative binary value
		System.out.println("b3 + 1 = "+(b3+1));
		System.out.println("b4 x 2 = "+(b4*2));
	}
}

输出：

b1 = 5
b2 = 5
b3 = -5
b4 = 10
is b1 and b2 equal: true
b2 + 1 = 6
b3 + 1 = -4
b4 x 2 = 20