JAVA编程题，求大神帮助

importjava.util.Scanner;publicclasstest{publicstaticvoidmain(String[]args){System.out.println("***************");System.out.println("请选择购买的商品编号：");System.out.println("1.T恤2.网球鞋3.网球拍");System.out.println("***************");doubletotal=0;Scannerin=newScanner(System.in);booleanb=true;do{intnum1,num2;doubletemp;System.out.println();System.out.print("请输入商品编号：");num1=in.nextInt();System.out.print("请输入购买数量：");num2=in.nextInt();switch(num1){case1:temp=num2*245.0;total+=temp;System.out.println("T恤245.0数量"+num2+"合计"temp);break:case2:temp=num2*570.0;total+=temp;System.out.println("网球鞋570.0数量"+num2+"合计"temp);