The difference between java & and && and examples

The difference between java & and &&: & is both a bit operator and a logical operator. Both sides of & can be int or boolean expressions. When both sides of & are int, the numbers on both sides of the operator must be converted into binary numbers before performing operations. The two sides of the short circuit and (&&) must be Boolean expressions.

I think many people will encounter it when learning Java or during interviews

&and&&

However, if you don't really understand what they mean, it will cause a lot of trouble in your thinking

In this blog, after you finish reading it, you will find that it is easy to distinguish them

Here is my demo

 /**
 *
 */
 package com.b510.test;

 /**
 * @author Jone Hongten
 * @create date: 2013-11-2
 * @version 1.0
 */
 public class Test {

 public static void main(String[] args) {
 String str = null;
 if(str != null && !"".equals(str)){
 //do something
 }
 if(str != null & !"".equals(str)){
 //do something
 }
 }
 }

We may have some blur now, so let's take a look at the circuit problems of & and &&:

for:&&

if(str != null && !"".equals(str))

When: str != null, the following execution will be performed: !"".equals(str)

If: str != null is false, then at this time, the program is in a short circuit, then !"".equals(str) will not be executed.

But for:&

if(str != null & !"".equals(str))

Regardless of the result of str != null (i.e. true, false), the program will execute: !"".equal(str)

Summary of circuit problems:

For:& --> No matter what, the program on the left and right sides of the "&" symbol will be executed

For: && -- > The program on the right side of the symbol "&&" will be executed only if the program on the left side of the symbol "&&" is true (true).

Let’s talk about the operation rules below:

For: & --> As long as one of the left and right sides is false, it is false; only when all are true, the result is true

For:&& --> As long as the left side of the symbol is false, the result is false; when the left side is true and the right side is true, the result is true

Thank you for reading, I hope it can help you. Thank you for your support for this site!