What is the difference between & and && in Java?

The difference between & and &&

1. && is not satisfied as long as one condition is different. If the first condition is not satisfied, the subsequent conditions will not be judged. . And & needs to judge all conditions.

Differences in concepts

2. && has the function of short circuit, & can be used as a bit operator.

&& has a short-circuit function, that is, if the first expression is false, the second expression will no longer be evaluated.

& can be used as a bit operator. When the expressions on both sides of the "&" operator are not of boolean type, "&" represents a bitwise AND operation. We usually use 0x0f to perform the & operation with an integer. To get the lowest 4 bits of the integer.

Example

public class demo02{
    public static void main(String[] args) {
       int i=1;
       if(i<5 & i<2){
           System.out.println("逻辑与");//逻辑与
       }
       if (i<5 && i<3){
           System.out.println("逻辑与"); //逻辑与
       }
       i = 234 & 99;
       int a = 234 && 99;//错误
       System.out.println(i);
    }
}

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