import java.doc

import java.util.Scanner;public class q public static void main(String args) System.out.print( 请输入若干个数，每输入一个数回车确认);System.out.print(最后输入数字0结束操作);/ TODO Auto-generated method stubScanner reader=new Scanner(System.in);double sum=0;double x=reader.nextDouble();while(x!=0)sum=sum+x;x=reader.nextDouble();System.out.print(sum=+sum);import java.util.Scanner;public class who /* * param args */public static void main(String args) / TODO Auto-generated method stubint number=0;System.out.print(输入正整数(回车确定);Scanner reader=new Scanner(System.in);number=reader.nextInt();switch(number)case 9:case 131:case 12: System.out.print(number+是三等奖); break;case 209:case 596:case 27:System.out.print(number+是二等奖); break;case 875:case 316:case 59: System.out.print(number+是一等奖);break;default:System.out.print(number+未中奖);public class t /* * param args */public static void main(String args) point1 p1,p2; p1=new point1(); p2=new point1(); System.out.println(p1的引用：+p1); System.out.println(p2的引用：+p2);p1.setXY(1111,2222);p2.setXY(-100,-200 );System.out.println(p1的x,y坐标：+p1.x+,+p1.y);p1=p2;System.out.print(将p2的引用赋给p1后：);System.out.print(p1的引用：+p1);System.out.print(p2的引用：+p2);System.out.print(p1的x,y坐标：+p1.x+,+p1.y);System.out.print(p2的x,y坐标：+p2.x+,+p2.y);public class PrimeNumberpublic static void main(String args) System.out.println(100以内的素数有：);int i=2,j=0,m;label1:for(i=2;i100;i+)for(m=2;m=(int)(Math.ceil(Math.sqrt(i);m+)if(i%m=0)continue label1;System.out.print(i+t); j+;if(j%5=0)System.out.println(); 求矩形和梯形的面积1.public class rect double weight; double height; double area() double getarea=weight*height; return weight*height; 2.public class lader double above; double bottom; double height; double laderarea() double laderarea=(above+bottom)*height/2; return (above+bottom)*height/2; public class areanew 3.public static void main(String args) rect a=new rect();double height=24;double weight=12;System.out.print(weight*height); lader b=n