Usage of in in java

The in operator in Java performs a bitwise AND operation on two integers and returns an integer that is 1 when each bit of the AND operand is 1. It is often used to check integer subsets, extract common bits and Boolean Operation.

Usage of in operator in Java

in The operator is a logical operator in bitwise operations in Java. It is used to perform a bitwise AND operation on two integers and return an integer that is 1 only when each bit of the two operands is 1.

Syntax

int result = a in b;

Where:

• a and b are integer operands.
• result is the result of the bitwise AND operation.

Working principle

#in The operator performs a bitwise AND operation on the two operands. The specific process is as follows:

1. First, convert the two operands into binary form.

2. Compare the binary bits of the two operands bit by bit:

   • If both bits are 1, the corresponding position of the result is 1.
   • If at least one bit is 0, the corresponding position of the result is 0.

Example

int a = 5;  // 二进制表示：101
int b = 7;  // 二进制表示：111

int result = a in b;  // 101 in 111 = 101

System.out.println(result);  // 输出：5

In this example:

• a and The binary forms of b are 101 and 111 respectively.

• Compare the binary bits of the two operands bit by bit:

  • 1 and 1 => 1
  • 0 and 1 => 0
  • 1 and 1 => 1
• The result of the bitwise AND operation is 101, which is also the decimal number 5.

Purpose

in The operator is often used in the following scenarios:

• Check whether an integer contains Some subset of another integer value.
• Extract the common bits of two integers.
• Perform Boolean operations, such as checking whether two conditions are true at the same time.

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