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import java.util.Scanner; public class deng { public void wolcome(){ Scanner in=new Scanner(System.in); int key = 0; yan y=new yan(); System.out.print 阅读全文
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public class StaticTest { //静态属性 static int j; static int s=80; int i; int k=55; /*静态代码块 * */ static { j=5; System.out.println("j的初始值为："+j); } public 阅读全文
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public class person { String name="无名"; String sex="man"; //无参构造 public person(){ name="山姆"; sex="男"; System.out.println("执行构造方法"); } //一个参数的构造方法 publ 阅读全文
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SELECT * FROM `category`//最新外卖显示SELECT max(Goodsld)FROM goods ;SELECT * FROM goods WHERE Goodsld in (SELECT max(Goodsld)FROM goods);//畅销外卖显示SELECT Goo 阅读全文
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SELECT * FROM `student` SELECT count(*) as '人数' FROM student ; SELECT SUM(exam) as '总成绩' FROM schooldb where studentid='2011001003'; SELECT avg(exam) 阅读全文