++与-- 自增运算符与自减运算符初识math工具类

package operator;

import com.sun.deploy.net.HttpDownload;

/**
 * @author xyf
 * @create 2020-08-10-13:52
 */
public class Demo3 {
    public static void main(String[] args) {
        // ++与-- zi'zeng
        int a=3;
        int b=a++; //执行完这行代码后，先给b赋值，再自增
        //a=a+1
        System.out.println(a);
        System.out.println(b);
        //a=a+1
        int c=++a; //先自增，再给c赋值
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);
        //幂运算 2^3
        double pow=Math.pow(3,2);
        System.out.println(pow);


    }
}

输出

"C:\Program Files\Java\jdk1.8.0_131\bin\java.exe" "-javaagent:D:\develpTools\IntelliJ IDEA 2020.2\lib\idea_rt.jar=50371:D:\develpTools\IntelliJ IDEA 2020.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_131\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\rt.jar;D:\workspace\基础语法\out\production\基础语法" operator.Demo3
4
3
5
3
5
9.0

Process finished with exit code 0